TypedArray.prototype.reduceRight() - JavaScript
the reduceright() method applies a function against an accumulator and each value of the typed array (from right-to-left) has to reduce it to a single value. this method has the same algorithm as array.prototype.reduceright(). typedarray is one of the typed array types here. syntax typedarray.reduceright(callback[, initialvalue]) parameters callback function to execute on each value in the typed array, taking four arguments: previousvalue the value previously returned in the last invocation of the callback, or initialvalue, if supplied (see below). currentvalue the current element being processed in the typed array. index the index of the current element being processed in the typed array. array the typed array reduce was called upon. initialvalue optional. obje...
...array. index the index of the current element being processed in the typed array. array the typed array reduce was called upon. initialvalue optional. object to use as the first argument to the first call of the callback. return value the value that results from the reduction. description the reduceright method executes the callback function once for each element present in the typed array, excluding holes in the typed array, receiving four arguments: the initial value (or value from the previous callback call), the value of the current element, the current index, and the typed array over which iteration is occurring. ...
...uceright method executes the callback function once for each element present in the typed array, excluding holes in the typed array, receiving four arguments: the initial value (or value from the previous callback call), the value of the current element, the current index, and the typed array over which iteration is occurring. the call to the reduceright callback would look something like this: typedarray.reduceright(function(previousvalue, currentvalue, index, typedarray) { // ... }); the first time the function is called, the previousvalue and currentvalue can be one of two values. if an initialvalue was provided in the call to reduceright, then previousvalue will be equal to initialvalue and currentvalue will be equal to the last value in the typed array. if no initialvalue was provid...
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TypeError: invalid Array.prototype.sort argument - JavaScript
the javascript exception "invalid array.prototype.sort argument" occurs when the argument of array.prototype.sort() isn't either undefined or a function which compares its operands. message typeerror: argument is not a function object (edge) typeerror: invalid array.prototype.sort argument (firefox) error type typeerror what went wrong? ...
... the javascript exception "invalid array.prototype.sort argument" occurs when the argument of array.prototype.sort() isn't either undefined or a function which compares its operands. message typeerror: argument is not a function object (edge) typeerror: invalid array.prototype.sort argument (firefox) error type typeerror what went wrong? ...
...t() isn't either undefined or a function which compares its operands. message typeerror: argument is not a function object (edge) typeerror: invalid array.prototype.sort argument (firefox) error type typeerror what went wrong? ...
...on object (edge) typeerror: invalid array.prototype.sort argument (firefox) error type typeerror what went wrong? ...

TypedArray.prototype.indexOf() - JavaScript
the indexof() method returns the first index at which a given element can be found in the typed array, or -1 if it is not present. this method has the same algorithm as array.prototype.indexof(). typedarray is one of the typed array types here. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax typedarray.indexof(searchelement[, fromindex = 0]) parameters searchelement element to locate in the typed array. fromindex the index to start the search at. if the index is greater than or equal to the typed array's length, -1 is returned, which means the typed array will not be searched. if the provided index va...
...ntax typedarray.indexof(searchelement[, fromindex = 0]) parameters searchelement element to locate in the typed array. fromindex the index to start the search at. if the index is greater than or equal to the typed array's length, -1 is returned, which means the typed array will not be searched. if the provided index value is a negative number, it is taken as the offset from the end of the typed array. note: if the provided index is negative, the typed array is still searched from front to back. if the calculated index is less than 0, then the whole typed array will be searched. default: 0 (entire typed array is searched). return value the first index of the element in the array; -1 if not found. ...
...from the end of the typed array. note: if the provided index is negative, the typed array is still searched from front to back. if the calculated index is less than 0, then the whole typed array will be searched. default: 0 (entire typed array is searched). return value the first index of the element in the array; -1 if not found. description indexof compares searchelement to elements of the typed array using strict equality (the same method used by the ===, or triple-equals, operator). ...
...of the typed array using strict equality (the same method used by the ===, or triple-equals, operator). examples using indexof var uint8 = new uint8array([2, 5, 9]); uint8.indexof(2); // 0 uint8.indexof(7); // -1 uint8.indexof(9, 2); // 2 uint8.indexof(2, -1); // -1 uint8.indexof(2, -3); // 0 specifications specification ecmascript (ecma-262)the definition of 'typedarray.prototype.indexof' in that specification. ...

TypedArray.prototype.join() - JavaScript
the join() method joins all elements of an array into a string. this method has the same algorithm as array.prototype.join(). typedarray is one of the typed array types here. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax typedarray.join([separator = ',']); parameters separator optional. specifies a string to separate each element. the separator is converted to a string if necessary. if omitted, the typed array elements are separated with a comma (","). ...
...amples and send us a pull request. syntax typedarray.join([separator = ',']); parameters separator optional. specifies a string to separate each element. the separator is converted to a string if necessary. if omitted, the typed array elements are separated with a comma (","). return value a string with all array elements joined. polyfill since there is no global object with the name typedarray, polyfilling must be done on an "as needed" basis. ...
...r optional. specifies a string to separate each element. the separator is converted to a string if necessary. if omitted, the typed array elements are separated with a comma (","). return value a string with all array elements joined. polyfill since there is no global object with the name typedarray, polyfilling must be done on an "as needed" basis. // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.join if (!uint8array.prototype.join) { object.defineproperty(uint8array.prototype, 'join', { value: array.prototype.join }); } if you need to support truly obsolete javascript engines that don't support object.defineproperty, it's best not to polyfill array.prototype methods at all, as you can't make them non-enumerable. examples using join var uint8 = new uint8arra...
...avascript engines that don't support object.defineproperty, it's best not to polyfill array.prototype methods at all, as you can't make them non-enumerable. examples using join var uint8 = new uint8array([1,2,3]); uint8.join(); // '1,2,3' uint8.join(' / '); // '1 / 2 / 3' uint8.join(''); // '123' specifications specification ecmascript (ecma-262)the definition of 'typedarray.prototype.join' in that specification. ...

TypedArray.prototype.lastIndexOf() - JavaScript
the lastindexof() method returns the last index at which a given element can be found in the typed array, or -1 if it is not present. the typed array is searched backwards, starting at fromindex. this method has the same algorithm as array.prototype.lastindexof(). typedarray is one of the typed array types here. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax typedarray.lastindexof(searchelement[, fromindex = typedarray.length]) parameters searchelement element to locate in the typed array. fromindex optional. the index at which to start searching backwards. defaults to the typed array's length, i.e. ...
...ibute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax typedarray.lastindexof(searchelement[, fromindex = typedarray.length]) parameters searchelement element to locate in the typed array. fromindex optional. the index at which to start searching backwards. defaults to the typed array's length, i.e. the whole typed array will be searched. if the index is greater than or equal to the length of the typed array, the whole typed array will be searched. if negative, it is taken as the offset from the end of the typed array. ...
...e typed array. fromindex optional. the index at which to start searching backwards. defaults to the typed array's length, i.e. the whole typed array will be searched. if the index is greater than or equal to the length of the typed array, the whole typed array will be searched. if negative, it is taken as the offset from the end of the typed array. note that even when the index is negative, the typed array is still searched from back to front. if the calculated index is less than 0, -1 is returned, i.e. the typed array will not be searched. return value the last index of the element in the array; -1 if not found. description lastindexof compares searchelement to elements of the typed array using strict equality (the same method used by the ===, or triple-equals, operator). examples us...
... used by the ===, or triple-equals, operator). examples using lastindexof var uint8 = new uint8array([2, 5, 9, 2]); uint8.lastindexof(2); // 3 uint8.lastindexof(7); // -1 uint8.lastindexof(2, 3); // 3 uint8.lastindexof(2, 2); // 0 uint8.lastindexof(2, -2); // 0 uint8.lastindexof(2, -1); // 3 specifications specification ecmascript (ecma-262)the definition of 'typedarray.prototype.lastindexof' in that specification. ...

TypedArray.prototype.set() - JavaScript
the set() method stores multiple values in the typed array, reading input values from a specified array. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax typedarray.set(array[, offset]) typedarray.set(typedarray[, offset]) parameters array the array from which to copy values. all values from the source array are copied into the target array, unless the length of the source array plus the offset exceeds the length of the target array, in which case an exception is thrown. ...
... offset optional the offset into the target array at which to begin writing values from the source array. ...
... offset optional the offset into the target array at which to begin writing values from the source array. ...
...gently copy the source range of the buffer to the destination range. offset optional the offset into the target array at which to begin writing values from the source array. if this value is omitted, 0 is assumed (that is, the source array will overwrite values in the target array starting at index 0). exceptions a rangeerror, if the offset is set such as it would store beyond the end of the typed array. examples using set() var buffer = new arraybuffer(8); var uint8 = new uint8array(buffer); uint8.set([1, 2, 3], 3); console.log(uint8); // uint8array [ 0, 0, 0, 1, 2, 3, 0, 0 ] specifications specification ecmascript (ecma-262)the definition of 'typedarray.prototype.set' in that specification. ...

TypedArray.prototype.toLocaleString() - JavaScript
the tolocalestring() method returns a string representing the elements of the typed array. the elements are converted to strings and are separated by a locale-specific string (such as a comma “,”). this method has the same algorithm as array.prototype.tolocalestring() and, as the typed array elements are numbers, the same algorithm as number.prototype.tolocalestring() applies for each element. typedarray is one of the typed array types here. syntax typedarray.tolocalestring([locales [, options]]); parameters the locales and options arguments customize the behavior of the function and let applications specify the language whose formatting conventions should be used. in implementations, which ignore the locales and options arguments, the locale used and the form of the string returned ...
...n and let applications specify the language whose formatting conventions should be used. in implementations, which ignore the locales and options arguments, the locale used and the form of the string returned are entirely implementation dependent. see the intl.numberformat() constructor for details on these parameters and how to use them. return value a string representing the elements of the typed array. examples using tolocalestring var uint = new uint32array([2000, 500, 8123, 12, 4212]); uint.tolocalestring(); // if run in a de-de locale // "2.000,500,8.123,12,4.212" uint.tolocalestring('en-us'); // "2,000,500,8,123,12,4,212" uint.tolocalestring('ja-jp', { style: 'currency', currency: 'jpy' }); // "￥2,000,￥500,￥8,123,￥12,￥4,212" specifications specification ...
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TypedArray.prototype.toString() - JavaScript
the tostring() method returns a string representing the specified array and its elements. this method has the same algorithm as array.prototype.tostring(). typedarray is one of the typed array types here. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax typedarray.tostring() return value a string representing the elements of the typed array. examples the typedarray objects override the tostring method of object. ...
... source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax typedarray.tostring() return value a string representing the elements of the typed array. examples the typedarray objects override the tostring method of object. for typedarray objects, the tostring method joins the array and returns one string containing each typed array element separated by commas. ...
...ctive-examples and send us a pull request. syntax typedarray.tostring() return value a string representing the elements of the typed array. examples the typedarray objects override the tostring method of object. for typedarray objects, the tostring method joins the array and returns one string containing each typed array element separated by commas. for example, the following code creates a typed array and uses tostring to convert the array to a string. var numbers = new uint8array([2, 5, 8, 1, 4]) numbers.tostring(); // "2,5,8,1,4" javascript calls the tostring method automatically when a typed array is to be represented as a text value or when an array is referred to in a string concatenation. ...
...xample, the following code creates a typed array and uses tostring to convert the array to a string. var numbers = new uint8array([2, 5, 8, 1, 4]) numbers.tostring(); // "2,5,8,1,4" javascript calls the tostring method automatically when a typed array is to be represented as a text value or when an array is referred to in a string concatenation. compatibility if a browser doesn't support the typedarray.prototype.tostring() method yet, javascript will call the tostring method of object: var numbers = new uint8array([2, 5, 8, 1, 4]) numbers.tostring(); // "[object uint8array]" specifications specification ecmascript (ecma-262)the definition of 'array.prototype.tostring' in that specification. ...

TypedArray.prototype.byteLength - JavaScript
the bytelength accessor property represents the length (in bytes) of a typed array. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. description the bytelength property is an accessor property whose set accessor function is undefined, meaning that you can only read this property. the value is established when a typedarray is constructed and cannot be changed. if the typedarray is not specifying an byteoffset or a length, the length of the referenced arraybuffer will be returned. typedarray is one of the typedarray objects. examples using the bytelength property var buffer = new arraybuffer(8); var uint8 = new ui...
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TypedArray.prototype.copyWithin() - JavaScript
the copywithin() method copies the sequence of array elements within the array to the position starting at target. the copy is taken from the index positions of the second and third arguments start and end. the end argument is optional and defaults to the length of the array. this method has the same algorithm as array.prototype.copywithin. typedarray is one of the typed array types here. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax typedarray.copywithin(target, start[, end = this.length]) parameters target target start index position where to copy the elements to. start source start index position...
... send us a pull request. syntax typedarray.copywithin(target, start[, end = this.length]) parameters target target start index position where to copy the elements to. start source start index position where to start copying elements from. end optional optional. source end index position where to end copying elements from. return value the modified array. description see array.prototype.copywithin for more details. ...
...y.prototype.copywithin for more details. examples using copywithin var buffer = new arraybuffer(8); var uint8 = new uint8array(buffer); uint8.set([1,2,3]); console.log(uint8); // uint8array [ 1, 2, 3, 0, 0, 0, 0, 0 ] uint8.copywithin(3,0,3); console.log(uint8); // uint8array [ 1, 2, 3, 1, 2, 3, 0, 0 ] specifications specification ecmascript (ecma-262)the definition of 'typedarray.prototype.copywithin' in that specification. ...

TypedArray.prototype.length - JavaScript
the length accessor property represents the length (in elements) of a typed array. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. description the length property is an accessor property whose set accessor function is undefined, meaning that you can only read this property. the value is established when a typedarray is constructed and cannot be changed. if the typedarray is not specifying an byteoffset or a length, the length of the referenced arraybuffer will be returned. typedarray is one of the typedarray objects. examples using the length property var buffer = new arraybuffer(8); var uint8 = new uint8array(...
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TypedArray.prototype.sort() - JavaScript
the sort() method sorts the elements of a typed array numerically in place and returns the typed array. this method has the same algorithm as array.prototype.sort(), except that sorts the values numerically instead of as strings. typedarray is one of the typed array types here. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax typedarray.sort([comparefunction]) parameters comparefunction optional specifies a function that defines the sort order. return value the sorted typed array. examples using sort for more examples, see also the array.prototype.sort() method. let numbers = new uint8array([40, 1...
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TypedArray.prototype[@@iterator]() - JavaScript
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TypedArray.prototype.buffer - JavaScript
the buffer accessor property represents the arraybuffer referenced by a typedarray at construction time. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. description the buffer property is an accessor property whose set accessor function is undefined, meaning that you can only read this property. the value is established when the typedarray is constructed and cannot be changed. typedarray is one of the typedarray objects. examples using the buffer property var buffer = new arraybuffer(8); var uint16 = new uint16array(buffer); uint16.buffer; // arraybuffer { bytelength: 8 } specifications specification...
...only read this property. the value is established when the typedarray is constructed and cannot be changed. typedarray is one of the typedarray objects. examples using the buffer property var buffer = new arraybuffer(8); var uint16 = new uint16array(buffer); uint16.buffer; // arraybuffer { bytelength: 8 } specifications specification ecmascript (ecma-262)the definition of 'typedarray.prototype.buffer' in that specification. ...

TypedArray.prototype.byteOffset - JavaScript
the byteoffset accessor property represents the offset (in bytes) of a typed array from the start of its arraybuffer. description the byteoffset property is an accessor property whose set accessor function is undefined, meaning that you can only read this property. the value is established when a typedarray is constructed and cannot be changed. typedarray is one of the typedarray objects. ...
... typedarray is one of the typedarray objects. examples using the byteoffset property var buffer = new arraybuffer(8); var uint8 = new uint8array(buffer); uint8.byteoffset; // 0 (no offset specified) var uint8 = new uint8array(buffer, 3); uint8.byteoffset; // 3 (as specified when constructing uint8array) specifications specification ecmascript (ecma-262)the definition of 'typedarray.prototype.byteoffset' in that specification. ...

TypedArray.prototype.entries() - JavaScript
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TypedArray.prototype.keys() - JavaScript
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TypedArray.prototype.reverse() - JavaScript
the reverse() method reverses a typed array in place. the first typed array element becomes the last and the last becomes the first. this method has the same algorithm as array.prototype.reverse(). typedarray is one of the typed array types here. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax typedarray.reverse(); return value the reversed array. ...
...teractive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax typedarray.reverse(); return value the reversed array. examples using reverse var uint8 = new uint8array([1, 2, 3]); uint8.reverse(); console.log(uint8); // uint8array [3, 2, 1] specifications specification ecmascript (ecma-262)the definition of 'typedarray.prototype.reverse' in that specification. ...

TypedArray.prototype.values() - JavaScript
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TypeScript support in Svelte - Learn web development
previous overview: client-side javascript frameworks next in the last article we learned about svelte stores and even implemented our own custom store to persist the app's information to web storage. we also had a look at using the transition directive to implement animations on dom elements in svelte. we will now learn how to use typescript in svelte applications. first we'll learn what typescript is and what benefits it can bring us. then we'll see how to configure our project to work with typescript files. finally we will go over our app and see what modifications we have to make to fully take advantage of typescript features. prerequisites: at minimum, it is recommended that you are familiar with the core html, css, and javascript languages, and have kn...
...cations we have to make to fully take advantage of typescript features. prerequisites: at minimum, it is recommended that you are familiar with the core html, css, and javascript languages, and have knowledge of the terminal/command line. you'll need a terminal with node + npm installed to compile and build your app. objective: learn how to configure and use typescript when developing svelte applications. note that our application is fully functional and porting it to typescript is completely optional. there are different opinions about it, and in this chapter we will talk briefly about the pros and cons of using typescript. even if you are not planning to adopt it, this article will be useful for allowing you to learn what it has to offer and help...
...application is fully functional and porting it to typescript is completely optional. there are different opinions about it, and in this chapter we will talk briefly about the pros and cons of using typescript. even if you are not planning to adopt it, this article will be useful for allowing you to learn what it has to offer and help you make your own decision. if you are not interested at all in typescript, you can skip to the next chapter, where we will look at different options for deploying our svelte applications, further resources, and more. ...
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Inheritance and the prototype chain - JavaScript
javascript is a bit confusing for developers experienced in class-based languages (like java or c++), as it is dynamic and does not provide a class implementation per se (the class keyword is introduced in es2015, but is syntactical sugar, javascript remains prototype-based). when it comes to inheritance, javascript only has one construct: objects. each object has a private property which holds a link to another object called its prototype. that prototype object has a prototype of its own, and so on until an object is reached with null as its prototype. by definition, null has no prototype, and acts as the final link in this prototype chain. nearly all objects in javascript are instances of object which sits on the top of a prototype chain. while this confusion is often considered to be on...
...pe chain. nearly all objects in javascript are instances of object which sits on the top of a prototype chain. while this confusion is often considered to be one of javascript's weaknesses, the prototypal inheritance model itself is, in fact, more powerful than the classic model. it is, for example, fairly trivial to build a classic model on top of a prototypal model. inheritance with the prototype chain inheriting properties javascript objects are dynamic "bags" of properties (referred to as own properties). javascript objects have a link to a prototype object. ...
..., for example, fairly trivial to build a classic model on top of a prototypal model. inheritance with the prototype chain inheriting properties javascript objects are dynamic "bags" of properties (referred to as own properties). javascript objects have a link to a prototype object. when trying to access a property of an object, the property will not only be sought on the object but on the prototype of the object, the prototype of the prototype, and so on until either a property with a matching name is found or the end of the prototype chain is reached. following the ecmascript standard, the notation someobject.[[prototype]] is used to designate the prototype of someobject. ...
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Type conversion
implicit convert in js-ctypes, data could be converted implicitly when passing to or returning from a functiontype call, or setting pointer content, an array element or a struct field. ...
... implicit convert in js-ctypes, data could be converted implicitly when passing to or returning from a functiontype call, or setting pointer content, an array element or a struct field. ...
... implicit convert in js-ctypes, data could be converted implicitly when passing to or returning from a functiontype call, or setting pointer content, an array element or a struct field. ...
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ctypes
similar to errno in libc, available on all platforms. cannot be set. winlasterror number|undefined the value of the latest windows error. ...
...similar to errno in libc, available on all platforms. cannot be set. winlasterror number|undefined the value of the latest windows error. ...
...similar to errno in libc, available on all platforms. cannot be set. winlasterror number|undefined the value of the latest windows error. ...
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Using Objective-C from js-ctypes
speech synthesis example let's start with the following objective-c code, which invokes the speech synthesis api to say "hello, firefox!". it uses the default system voice and waits until the speaking is done. ...
... speech synthesis example let's start with the following objective-c code, which invokes the speech synthesis api to say "hello, firefox!". it uses the default system voice and waits until the speaking is done. ...
... speech synthesis example let's start with the following objective-c code, which invokes the speech synthesis api to say "hello, firefox!". it uses the default system voice and waits until the speaking is done. ...
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Using js-ctypes
before you can use js-ctypes, you need to import the ctypes.jsm code module. this is as simple as including the following line of code in the desired javascript scope: components.utils.import("resource://gre/modules/ctypes.jsm") loading a native library once you've imported the code module, you can call the ctypes.open() method to load each native library you wish to use. ...
...e module. this is as simple as including the following line of code in the desired javascript scope: components.utils.import("resource://gre/modules/ctypes.jsm") loading a native library once you've imported the code module, you can call the ctypes.open() method to load each native library you wish to use. ...
...instead, you'll need to create a shim library that uses c functions that then call into the c++ library for you. ...
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Object prototypes - Learn web development
previous overview: objects next prototypes are the mechanism by which javascript objects inherit features from one another. in this article, we explain how prototype chains work and look at how the prototype property can be used to add methods to existing constructors. note: this article covers traditional javascript constructors and classes. in the next article, we talk about the modern way of doing things, which provides easier syntax to achieve the same things — see ecmascript 2015 classes. prerequisites: understanding javascript functions, familiarity with javascript basics (see first steps and building blocks), and oojs basics (see introduction to objects). ...
... the next article, we talk about the modern way of doing things, which provides easier syntax to achieve the same things — see ecmascript 2015 classes. prerequisites: understanding javascript functions, familiarity with javascript basics (see first steps and building blocks), and oojs basics (see introduction to objects). ...
...e, we talk about the modern way of doing things, which provides easier syntax to achieve the same things — see ecmascript 2015 classes. prerequisites: understanding javascript functions, familiarity with javascript basics (see first steps and building blocks), and oojs basics (see introduction to objects). ...
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<input type="file"> - HTML: Hypertext Markup Language
once chosen, the files can be uploaded to a server using form submission, or manipulated using javascript code and the file api. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. value a domstring representing the path to the selected file. ...
...equest. value a domstring representing the path to the selected file. events change and input supported common attributes required additional attributes accept, capture, files, multiple idl attributes files and value dom interface htmlinputelement properties properties that apply only to elements of type file methods select() value a file input's value attribute contains a domstring that represents the path to the selected file(s). if the user selected multiple files, the value represents the first file in the list of files they selected. the other files can be identified using the input's htmlinputelement.files property. note: if multiple files are selected, the strin...
...ted, the string represents the first selected file. javascript can access the other files through the input's files property. if no file is yet selected, the string is "" (empty). the string is prefixed with c:\fakepath\, to prevent malicious software from guessing the user's file structure. ...
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TypedArray - JavaScript
a typedarray object describes an array-like view of an underlying binary data buffer. there is no global property named typedarray, nor is there a directly visible typedarray constructor. instead, there are a number of different global properties, whose values are typed array constructors for specific element types, listed below. on the following pages you will find common properties and methods that can be used with any typed array containing elements of any type. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. ...
...ollowing pages you will find common properties and methods that can be used with any typed array containing elements of any type. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. description ecmascript 2015 defines a typedarray constructor that serves as the [[prototype]] of all typedarray constructors. this constructor is not directly exposed: there is no global %typedarray% or typedarray property. it is only directly accessible through object.getprototypeof(int8array) and similar. ...
... clone https://github.com/mdn/interactive-examples and send us a pull request. description ecmascript 2015 defines a typedarray constructor that serves as the [[prototype]] of all typedarray constructors. this constructor is not directly exposed: there is no global %typedarray% or typedarray property. it is only directly accessible through object.getprototypeof(int8array) and similar. all typedarrays constructors inherit common properties from the %typedarray% constructor function. additionally, all typed array prototypes (typedarray.prototype) have %typedarray%.prototype as their [[prototype]]. the %typedarray% constructor on its own is not particularly useful. ...
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Declaring types
the ctypes object offers a number of constructor methods that let you declare types. every type is represented by a ctype object, which, in turn, provides a constructor method you can call to define values of those types. each type you declare using js-ctypes corresponds to a compatible c declaration. types are declared in terms of other, already defined types. at the core of all this is a set of predefined types provided by js-ctypes. these are all primitive types, upon which all other types are eventually based. primitive types primitive types are those types that represent a single value in memory, as opposed to arrays, structures, or functions. you can define values of these types without declaring new types. for example, to define a new 32-bit integer variable with the value 5: var...
...ined types provided by js-ctypes. these are all primitive types, upon which all other types are eventually based. primitive types primitive types are those types that represent a single value in memory, as opposed to arrays, structures, or functions. you can define values of these types without declaring new types. for example, to define a new 32-bit integer variable with the value 5: var i = ctypes.int32_t(5); you can then pass a pointer to this value to a c function that requires a pointer to a 32-bit integer, like this: some_c_function(i.address()); declaring new primitive types there are times when you want to create new types that are simply new names for existing primitive types. ...
...5: var i = ctypes.int32_t(5); you can then pass a pointer to this value to a c function that requires a pointer to a 32-bit integer, like this: some_c_function(i.address()); declaring new primitive types there are times when you want to create new types that are simply new names for existing primitive types. for example, on windows, you may wish to be able to use the windows-standard dword type name for unsigned 32-bit integers. to declare this type, you can simply do: const dword = ctypes.uint32_t; after doing this, dword is a ctype that can then be used to represent 32-bit unsigned integers. structures structures are declared using the ctypes.structtype() constructor. this method accepts as input the name of the structure and an array of field descriptors, each describing one fie...
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Using COM from js-ctypes
erent windows applications among themselves, microsoft has developed a series of technologies alongside the main windows api. this started out with dynamic data exchange (dde), which was superseded by object linking and embedding (ole) and later by the component object model (com), automation objects, activex controls, and the .net framework. ...
...es of technologies alongside the main windows api. this started out with dynamic data exchange (dde), which was superseded by object linking and embedding (ole) and later by the component object model (com), automation objects, activex controls, and the .net framework. com is c++ and it cannot be written directly with js-ctypes. this documentaion explains how to convert the com c++ code into js-ctypes code. basis and reference for this article bugzilla :: bug 738501 - implement ability to create windows shortcuts from javascript - comment 4 relavent topic bugzilla :: bug 505907 - support c++ calling from jsctypes converting com code to c code to convert com code to js-ctypes, we need to write c++ vtable pointers in c. after that, we can pass a pointer . speech synthesis example let...
...se(); } } // msdn documentation says that even if coinitalize fails, counitialize // must be called couninitialize(); return 0; } to run the code, save it as test.cpp, and run following command in the directory (needs visual studio). $ cl ole32.lib test.cpp vtable needs vtable description here. the order of the vtable is very critical. when used from c or js-ctypes, the order of the vtable methods should match the order of the c++ vtable. __stdcall and __cdecl needs __stdcall and __cdecl (callback_abi) description here. call by reference needs c++ reference (&) and c pointer (*) description here. converted c code now we can translate whole code into c syntax. #include <sapi.h> int main(void) { if (succeeded(coinitialize(null))) { ...
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Function.prototype.bind() - JavaScript
onstructed. the provided this value is ignored, while prepended arguments are provided to the emulated function. polyfill because older browsers are generally also slower browsers, it is far more critical than most people recognize to create performance polyfills to make the browsing experience in outdated browsers slightly less horrible. thus, presented below are two options for function.prototype.bind() polyfills: the first one is much smaller and more performant, but does not work when using the new operator. the second one is bigger and less performant, but it permits some usage of the new operator on bound functions. generally, in most code it's very rare to see new used on a bound function, so it is generally best to go with the first option. // does not work with `new (funca.
...ch smaller and more performant, but does not work when using the new operator. the second one is bigger and less performant, but it permits some usage of the new operator on bound functions. generally, in most code it's very rare to see new used on a bound function, so it is generally best to go with the first option. ...
... when using the new operator. the second one is bigger and less performant, but it permits some usage of the new operator on bound functions. generally, in most code it's very rare to see new used on a bound function, so it is generally best to go with the first option. ...
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The HTML5 input types - Learn web development
previous overview: forms next in the previous article we looked at the <input> element, covering the original values of the type attribute available since the early days of html. now we'll look at the functionality of newer form controls in detail, including some new input types, which were added in html5 to allow collection of specific types of data. prerequisites: basic computer literacy, and a basic understanding of html. objective: to understand the newer input type values available to create native form controls, and how to implement them using html. note: most of the features discussed in this article have wide support across browsers. we'll note any exceptions. if you want more detail on browser support, you should consult our html forms elemen...
... objective: to understand the newer input type values available to create native form controls, and how to implement them using html. note: most of the features discussed in this article have wide support across browsers. we'll note any exceptions. if you want more detail on browser support, you should consult our html forms element reference, and in particular our extensive <input> types reference. because html form control appearance may be quite different from a designer's specifications, web developers sometimes build their own custom form controls. we cover this in an advanced tutorial: how to build custom form widgets. ...
...re detail on browser support, you should consult our html forms element reference, and in particular our extensive <input> types reference. because html form control appearance may be quite different from a designer's specifications, web developers sometimes build their own custom form controls. we cover this in an advanced tutorial: how to build custom form widgets. e-mail address field this type of field is set using the value email for the type attribute: <input type="email" id="email" name="email"> when this type is used, the user is required to type a valid email address into the field. any other content causes the browser to display an error when the form is submitted. you can see this in action in the below screenshot. you can also use the multiple attribute in combination with...
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JavaScript-DOM Prototypes in Mozilla
prototype setup on an xpconnect wrapped dom node in mozilla when a dom node is accessed from javascript in mozilla, the native c++ dom node is wrapped using xpconnect and the wrapper is exposed to javascript as the javascript representation of the dom node. when xpconnect wraps a c++ object it will create a jsobject that is unique to this c++ object. in the case where the c++ object has class info (nsiclassinfo), the jsobject is a more or less empty jsobject which is not really that special. ...
... the dom node. when xpconnect wraps a c++ object it will create a jsobject that is unique to this c++ object. in the case where the c++ object has class info (nsiclassinfo), the jsobject is a more or less empty jsobject which is not really that special. all the methods that are supposed to show up on this jsobject are actually not properties of the object itself, but rather properties of the prototype of the jsobject for the wrapper (unless the c++ object's class info has the flag nsixpcscriptable::dont_share_prototype set, but lets assume that's not the case here). as an example of this let's look at an html image element in a document. var obj = document.images[0]; here, obj will not really have any properties (except for the standard jsobject properties such as constructor, and the non-...
...able::dont_share_prototype set, but lets assume that's not the case here). as an example of this let's look at an html image element in a document. var obj = document.images[0]; here, obj will not really have any properties (except for the standard jsobject properties such as constructor, and the non-standard __parent__, __proto__, etc.), all the dom functionality of obj comes from obj's prototype (obj.__proto__) that xpconnect sets up when exposing the first image in document to javascript. here are a few of the properties of obj's prototype: obj.__proto__ parentnode (getter function) src (getter and setter functions) getelementsbytagname (function) text_node (number property, constant) ... all those properties come from the interfaces that the c++ image object (nshtmlimageel...
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typeof - JavaScript
the typeof operator returns a string indicating the type of the unevaluated operand. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax the typeof operator is followed by its operand: typeof operand typeof(operand) parameters operand an expression representing the object or primitive whose type is to be returned. description the following table summarizes the possible return values of typeof. for more information about types and primitives, see also the javascript data structure page. ...
... a pull request. syntax the typeof operator is followed by its operand: typeof operand typeof(operand) parameters operand an expression representing the object or primitive whose type is to be returned. description the following table summarizes the possible return values of typeof. for more information about types and primitives, see also the javascript data structure page. ...
...ect" (see below) boolean "boolean" number "number" bigint (new in ecmascript 2020) "bigint" string "string" symbol (new in ecmascript 2015) "symbol" function object (implements [[call]] in ecma-262 terms) "function" any other object "object" note: ecmascript 2019 and older permitted implementations to have typeof return any implementation-defined string value for non-callable non-standard exotic objects. the only known browser to have actually taken advantage of this is old internet explorer (see below). examples basic usage // numbers typeof 37 === 'number'; typeof 3.14 === 'number'; typeof(42) === 'number'; typeof math.ln2 === 'number'; typeof infinity === 'number'; typeof nan === 'number'; // de...
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The "codecs" parameter in common media types - Web media technologies
at a fundamental level, you can specify the type of a media file using a simple mime type, such as video/mp4 or audio/mpeg. however, many media types—especially those that support video tracks—can benefit from the ability to more precisely describe the format of the data within them. for instance, just describing a video in an mpeg-4 file with the mime type video/mp4 doesn't say anything about what format the actual media within takes. for that reason, the codecs parameter can be added to the mime type describing media content. with it, container-specific information can be provided. this information may include things like the profile of the video codec, the type used for the audio tracks, and so forth. ...
...4 doesn't say anything about what format the actual media within takes. for that reason, the codecs parameter can be added to the mime type describing media content. with it, container-specific information can be provided. this information may include things like the profile of the video codec, the type used for the audio tracks, and so forth. this guide briefly examines the syntax of the media type codecs parameter and how it's used with the mime type string to provide details about the contents of audio or video media beyond simply indicating the container type. ...
...n be provided. this information may include things like the profile of the video codec, the type used for the audio tracks, and so forth. this guide briefly examines the syntax of the media type codecs parameter and how it's used with the mime type string to provide details about the contents of audio or video media beyond simply indicating the container type. general syntax a basic mime media type is expressed by stating the type of media (audio, video, etc), then a slash character (/), then the container format used to contain the media: audio/mpeg an audio file using the mpeg file type, such as an mp3. video/ogg a video file using the ogg file type. video/mp4 a video file using the mpeg-4 file type. video/quicktime a video file in apple's quicktime format. as noted elsewhere, t...
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<input type="tel"> - HTML: Hypertext Markup Language
<input> elements of type tel are used to let the user enter and edit a telephone number. unlike <input type="email"> and <input type="url"> , the input value is not automatically validated to a particular format before the form can be submitted, because formats for telephone numbers vary so much around the world. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. ...
...lly validated to a particular format before the form can be submitted, because formats for telephone numbers vary so much around the world. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. despite the fact that inputs of type tel are functionally identical to standard text inputs, they do serve useful purposes; the most quickly apparent of these is that mobile browsers — especially on mobile phones — may opt to present a custom keypad optimized for entering phone numbers. using a specific input type for telephone numbers also makes adding custom validation and handling of phone numbers more convenient. note: bro...
...ntical to standard text inputs, they do serve useful purposes; the most quickly apparent of these is that mobile browsers — especially on mobile phones — may opt to present a custom keypad optimized for entering phone numbers. using a specific input type for telephone numbers also makes adding custom validation and handling of phone numbers more convenient. note: browsers that don't support type tel fall back to being a standard text input. value a domstring representing a telephone number, or empty events change and input supported common attributes autocomplete, list, maxlength, minlength, pattern, placeholder, readonly, and size idl attributes list, selectionstart, selectionend, selectiondirection, and value methods select(...
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<input type="time"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. ...
... the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. ...
...ue, valueasdate, valueasnumber, and list. methods select(), stepdown(), and stepup(). value a domstring containing the value of the time entered into the input. ...
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<input type="number"> - HTML: Hypertext Markup Language
value any floating-point number, or empty. ...
...to provide stepper arrows to let the user increase and decrease the value using their mouse or by simply tapping with a fingertip. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. on browsers that don't support inputs of type number, a number input falls back to type text. value any floating-point number, or empty. events change and input supported common attributes autocomplete, list, placeholder, readonly idl attributes list, value, valueasnumber methods select(), stepup(), stepdown() value any floating-point number, or empty. you can set a default...
...pty. events change and input supported common attributes autocomplete, list, placeholder, readonly idl attributes list, value, valueasnumber methods select(), stepup(), stepdown() value any floating-point number, or empty. ...
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<input type="datetime-local"> - HTML: Hypertext Markup Language
<input> elements of type datetime-local create input controls that let the user easily enter both a date and a time, including the year, month, and day as well as the time in hours and minutes. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. the control's ui varies in general from browser to browser; at the moment support is patchy, with only chrome/opera and edge on desktop and most modern versions of mobile browsers having usable implementations. in other browsers, these degrade gracefully to simple <input type="text"> controls. the control is intended to simply represent a local date and time, not necessarily th...
... (in the local time zone), or empty. events change and input supported common attributes autocomplete, list, readonly, and step idl attributes list, value, valueasnumber. methods select(), stepdown(), stepup() value a domstring representing the value of the date entered into the input. ...
...senting the value of the date entered into the input. the format of the date and time value used by this input type is described in local date and time strings in date and time formats used in html. you can set a default value for the input by including a date and time inside the value attribute, like so: <label for="party">enter a date and time for your party booking:</label> <input id="party" type="datetime-local" name="partydate" value="2017-06-01t08:30"> one thing to note is that the displayed date and time formats differ from the actual value; the displayed date and time are formatted according to the user's locale as reported by their operating system, whereas the date/time value is always formatted yyyy-mm-ddthh:mm. when the above value submitted to the server, for example, it will...
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<input type="email"> - HTML: Hypertext Markup Language
<input> elements of type email are used to let the user enter and edit an e-mail address, or, if the multiple attribute is specified, a list of e-mail addresses. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. the input value is automatically validated to ensure that it's either empty or a properly-formatted e-mail address (or list of addresses) before the form can be submitted. the :valid and :invalid css pseudo-classes are automatically applied as appropriate to visually denote whether the current value of the field is a valid e-mail address or not. ...
...request. the input value is automatically validated to ensure that it's either empty or a properly-formatted e-mail address (or list of addresses) before the form can be submitted. the :valid and :invalid css pseudo-classes are automatically applied as appropriate to visually denote whether the current value of the field is a valid e-mail address or not. ...
... a valid e-mail address or not. on browsers that don't support inputs of type email, a email input falls back to being a standard text input. value a domstring representing an e-mail address, or empty events change and input supported common attributes autocomplete, list, maxlength, minlength, multiple, name,pattern, placeholder, readonly, required, size, and type idl attributes list and value methods select() value the <input> element's value attribute contains a domstring which is automatically validated as conforming to e-mail syntax. more specifically, there are three possible value formats that will pass validation: an empty string ("") indicating that the user did not enter a value or that the value was removed. a ...
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JavaScript data types and data structures - JavaScript
programming languages all have built-in data structures, but these often differ from one language to another. this article attempts to list the built-in data structures available in javascript and what properties they have. these can be used to build other data structures. wherever possible, comparisons with other languages are drawn. dynamic typing javascript is a loosely typed and dynamic language. ...
... one language to another. this article attempts to list the built-in data structures available in javascript and what properties they have. these can be used to build other data structures. wherever possible, comparisons with other languages are drawn. dynamic typing javascript is a loosely typed and dynamic language. ...
...ta structures available in javascript and what properties they have. these can be used to build other data structures. wherever possible, comparisons with other languages are drawn. dynamic typing javascript is a loosely typed and dynamic language. ...
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<input type="month"> - HTML: Hypertext Markup Language
the value is a string whose value is in the format "yyyy-mm", where yyyy is the four-digit year and mm is the month number. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. the control's ui varies in general from browser to browser; at the moment support is patchy, with only chrome/opera and edge on desktop — and most modern mobile browser versions — having usable implementations. ...
...t, please clone https://github.com/mdn/interactive-examples and send us a pull request. the control's ui varies in general from browser to browser; at the moment support is patchy, with only chrome/opera and edge on desktop — and most modern mobile browser versions — having usable implementations. in browsers that don't support month inputs, the control degrades gracefully to a simple <input type="text">, although there may be automatic validation of the entered text to ensure it's formatted as expected. for those of you using a browser that doesn't support month, the screenshot below shows what it looks like in chrome and opera. clicking the down arrow on the right hand side brings up a date picker that lets you select the month and year. the microsoft edge month control looks like t...
...pported common attributes autocomplete, list, readonly, and step. idl attributes value methods select(), stepdown(), stepup(). value a domstring representing the value of the month and year entered into the input, in the form yyyy-mm (four or more digit year, then a hyphen ("-"), followed by the two-digit month). ...
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Object.setPrototypeOf() - JavaScript
because this feature is a part of the language, it is still the burden on engine developers to implement that feature performantly (ideally). ...
... because this feature is a part of the language, it is still the burden on engine developers to implement that feature performantly (ideally). ...
...perty) of a specified object to another object or null. warning: changing the [[prototype]] of an object is, by the nature of how modern javascript engines optimize property accesses, currently a very slow operation in every browser and javascript engine. in addition, the effects of altering inheritance are subtle and far-flung, and are not limited to simply the time spent in the object.setprototypeof(...) statement, but may extend to any code that has access to any object whose [[prototype]] has been altered. because this feature is a part of the language, it is still the burden on engine developers to implement that feature performantly (ideally). until engine developers address this issue, if you are concerned about performance, you should avoid setting the [[prototype]] of an object. in...
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Image file type and format guide - Web media technologies
in this guide, we'll cover the image file types generally supported by web browsers, and provide insights that will help you select the most appropriate formats to use for your site's imagery. common image file types there are many image file formats in the world. however, the ones listed below are generally recognized as usable on the web, though bmp is generally not recommended as browser support is potentially constrained; it should usually be avoided for web content. ...
...select the most appropriate formats to use for your site's imagery. common image file types there are many image file formats in the world. however, the ones listed below are generally recognized as usable on the web, though bmp is generally not recommended as browser support is potentially constrained; it should usually be avoided for web content. ...
... none built-in; add-ons required webp web picture format image/webp .webp chrome, edge, firefox, opera the abbreviation for each format links to a longer description of the format, its capabilities, and detailed browser compatibility information; including which versions introduced support and specific special features that may have been introduced later. image file type details the following sections provide a brief overview of each of the image file types supported by web browsers. in the tables below, the term bits per component refers to the number of bits used to represent each color component. for example, an rgb color depth of 8 indicates that each of the red, green, and blue components are represented by an 8-bit value. bit depth, on the other hand, is ...
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Media container formats (file types) - Web media technologies
in this guide, we'll look at the container formats used most commonly on the web, covering basics about their specifications as well as their benefits, limitations, and ideal use cases. webrtc does not use a container at all. instead, it streams the encoded audio and video tracks directly from one peer to another using mediastreamtrack objects to represent each track. ...
...ee codecs used by webrtc for information about codecs commonly used for making webrtc calls, as well as browser compatibility information around codec support in webrtc. common container formats while there are a vast number of media container formats, the ones listed below are the ones you are most likely to encounter. some support only audio while others support both audio and video. the mime types and extensions for each are listed.the most commonly used containers for media on the web are probably mpeg-4 (mp4), quicktime movie (mov), and the wavefile audio file format (wav). however, you may also encounter mp3, ogg, webm, avi, and other formats. not all of these are broadly supported by browsers, however; some combinations of container and codec are sometimes given their own file extensi...
...ons for each are listed.the most commonly used containers for media on the web are probably mpeg-4 (mp4), quicktime movie (mov), and the wavefile audio file format (wav). however, you may also encounter mp3, ogg, webm, avi, and other formats. not all of these are broadly supported by browsers, however; some combinations of container and codec are sometimes given their own file extensions and mime types as a matter of convenience, or because of their ubiquity. for example, an ogg file with only an opus audio track is sometimes referred to as an opus file, and might even have the extension .opus. but it's still actually just an ogg file. in other cases, a particular codec, stored in a certain container type, is so ubiquitous that the pairing is treated in a unique fashion. a good example of thi...
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Recommended Drag Types - Web APIs
the html drag and drop api supports dragging various types of data, including plain text, urls, html code, files, etc. the document describes best practices for common draggable data types. caution: all methods and properties in this document with a moz prefix, such as mozsetdataat(), will only work with gecko-based browsers. dragging text for dragging text, use the text/plain type. the second data parameter should be the dragged string. for example: event.datatransfer.setdata("text/plain", "this is text to drag"); dragging text in textboxes and selections on web pages is done automatically by the browser, so you do not need to handle it yourself. ...
...browsers. dragging text for dragging text, use the text/plain type. the second data parameter should be the dragged string. for example: event.datatransfer.setdata("text/plain", "this is text to drag"); dragging text in textboxes and selections on web pages is done automatically by the browser, so you do not need to handle it yourself. it is recommended to always add data of the text/plain type as a fallback for applications or drop targets that do not support other types, unless there is no logical text alternative. always add this text/plain type last, as it is the least specific and shouldn’t be preferred. note: in older code, you may find text/unicode or the text types. these are equivalent to text/plain, and will store and retrieve plain text data. dragging links dragged hyper...
...r drop targets that do not support other types, unless there is no logical text alternative. always add this text/plain type last, as it is the least specific and shouldn’t be preferred. note: in older code, you may find text/unicode or the text types. these are equivalent to text/plain, and will store and retrieve plain text data. dragging links dragged hyperlinks should include data of two types: text/uri-list, and text/plain. both types should use the link’s url for their data. for example: var dt = event.datatransfer; dt.setdata("text/uri-list", "https://www.mozilla.org"); dt.setdata("text/plain", "https://www.mozilla.org"); as usual, set the text/plain type last, as a fallback for the text/uri-list type. note: the url type is uri-list with an i, not an l. to drag multiple link...
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<input type="range"> - HTML: Hypertext Markup Language
<input> elements of type range let the user specify a numeric value which must be no less than a given value, and no more than another given value. the precise value, however, is not considered important. this is typically represented using a slider or dial control rather than a text entry box like the number input type. because this kind of widget is imprecise, it shouldn't typically be used unless the control's exact value isn't important. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. if the user's browser doesn't support type range, it will fall back and treat it as a text input. value a domstring ...
...value min the minimum permitted value step the stepping interval, used both for user interface and validation purposes list the values of the list attribute is the id of a <datalist> element located in the same document. the <datalist> provides a list of predefined values to suggest to the user for this input. any values in the list that are not compatible with the type are not included in the suggested options. the values provided are suggestions, not requirements: users can select from this predefined list or provide a different value. see the range control with hash marks below for an example of how the options on a range are denoted in supported browsers max the greatest value in the range of permitted values. if the value entered into the element exceeds...
...e -moz-orient non-standard css property impacting the <progress> and <meter> elements, the orient attribute defines the orientation of the range slider. values include horizontal, meaing the range is rendered horizontally, and vertical, where the range is rendered vertically. ...
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<input type="url"> - HTML: Hypertext Markup Language
<input> elements of type url are used to let the user enter and edit a url. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. the input value is automatically validated to ensure that it's either empty or a properly-formatted url before the form can be submitted. the :valid and :invalid css pseudo-classes are automatically applied as appropriate to visually denote whether the current value of the field is a valid url or not. on browsers that don't support inputs of type url, a url input falls back to being a standard text input. value a domstring representing a url, or empty events change and...
...oved. a single properly-formed absolute url. this doesn't necessarily mean the url address exists, but it is at least formatted correctly. in simple terms, this means urlscheme://restofurl. see validation for details on how urls are validated to ensure that they're formatted properly. ...
...llcheck controls whether or not to enable spell checking for the input field, or if the default spell checking configuration should be used list the values of the list attribute is the id of a <datalist> element located in the same document. the <datalist> provides a list of predefined values to suggest to the user for this input. any values in the list that are not compatible with the type are not included in the suggested options. the values provided are suggestions, not requirements: users can select from this predefined list or provide a different value. maxlength the maximum number of characters (as utf-16 code units) the user can enter into the url input. this must be an integer value 0 or higher. if no maxlength is specified, or an invalid value is specified, the url input ...
...And 19 more matches

<input type="image"> - HTML: Hypertext Markup Language
<input> elements of type image are used to create graphical submit buttons, i.e. submit buttons that take the form of an image rather than text. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. value none — the value attribute should not be specified. events none. supported common attributes alt, src, width, height, formaction, formenctype, formmethod, formnovalidate, formtarget idl attributes none. methods none. value <input type="image"> elements do not accept value attributes. the path to the image to be displayed is specified in the src attribu...
...he path to the image to be displayed is specified in the src attribute. ...
... be a non-empty string appropriate as a label for the button. for example, if you have a graphical button that shows an image with an icon and/or image text "login now", you should also set the alt attribute to something like login now. important: while the alt attribute is technically optional, you should always include one to maximize the usability of your content. ...
...And 18 more matches

<input type="search"> - HTML: Hypertext Markup Language
these are functionally identical to text inputs, but may be styled differently by the user agent. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. value a domstring representing the value contained in the search field. events change and input supported common attributes autocomplete, list, maxlength, minlength, pattern, placeholder, required, size. idl attributes value methods select(), setrangetext(), setselectionrange(). ...
...tained in the search field. you can retrieve this using the htmlinputelement.value property in javascript. searchterms = mysearch.value; if no validation constraints are in place for the input (see validation for more details), the value can be any text string or an empty string (""). ...
...llcheck controls whether or not to enable spell checking for the input field, or if the default spell checking configuration should be used list the values of the list attribute is the id of a <datalist> element located in the same document. the <datalist> provides a list of predefined values to suggest to the user for this input. any values in the list that are not compatible with the type are not included in the suggested options. the values provided are suggestions, not requirements: users can select from this predefined list or provide a different value. maxlength the maximum number of characters (as utf-16 code units) the user can enter into the search field. this must be an integer value 0 or higher. if no maxlength is specified, or an invalid value is specified, the search ...
...And 18 more matches

Object.prototype.constructor - JavaScript
's name. the value is only read-only for primitive values such as 1, true, and "test". description all objects (with the exception of objects created with object.create(null)) will have a constructor property. ...
...the example then displays the constructor property for the object thetree. ...
... output: thetree.constructor is function tree(name) { this.name = name } changing the constructor of an object the following example shows how to modify the constructor value of generic objects. only true, 1, and "test" will not be affected (as they have read-only native constructors). this example shows that it is not always safe to rely on the constructor property of an object. ...
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<input type="week"> - HTML: Hypertext Markup Language
<input> elements of type week create input fields allowing easy entry of a year plus the iso 8601 week number during that year (i.e., week 1 to 52 or 53). the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. the control's user interface varies from browser to browser; cross-browser support is currently a bit limited, with only chrome/opera and microsoft edge supporting it at this time. in non-supporting browsers, the control degrades gracefully to function identically to <input type="text">. in chrome/opera the week control provides slots to fill in week and year values, a pop-up calendar interface to select them more v...
..., or empty events change and input supported common attributes autocomplete, list, readonly, and step idl attributes value, valueasdate, valueasnumber, and list. methods select(), stepdown(), and stepup() value a domstring representing the value of the week/year entered into the input. ...
...omstring representing the value of the week/year entered into the input. the format of the date and time value used by this input type is described in format of a valid week string in date and time formats used in html. you can set a default value for the input by including a value inside the value attribute, like so: <label for="week">what week would you like to start?</label> <input id="week" type="week" name="week" value="2017-w01"> one thing to note is that the displayed format may differ from the actual value, which is always formatted yyyy-www. when the above value is submitted to the server, for example, browsers may display it as week 01, 2017, but the submitted value will always look like week=2017-w01. you can also get and set the value in javascript using the input element's v...
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Grammar and types - JavaScript
basics javascript borrows most of its syntax from java, c, and c++, but it has also been influenced by awk, perl, and python. javascript is case-sensitive and uses the unicode character set. for example, the word früh (which means "early" in german) could be used as a variable name. let früh = "foobar" but, the variable früh is not the same as früh because javascript is case sensitive. in javascript, instructions are called statements and are separated by semicolons (;). ...
...pace. (spaces, tabs, and newline characters are considered whitespace.) comments the syntax of comments is the same as in c++ and in many other languages: // a one line comment /* this is a longer, * multi-line comment */ /* you can't, however, /* nest comments */ syntaxerror */ comments behave like whitespace, and are discarded during script execution. note: you might also see a third type of comment syntax at the start of some javascript files, which looks something like this: #!/usr/bin/env node. this is called hashbang comment syntax, and is a special comment used to specify the path to a particular javascript engine that should execute the script. see hashbang comments for more details. declarations javascript has three kinds of variable declarations. var declares a var...
... the variable is in a "temporal dead zone" from the start of the block until the declaration is processed. console.log(x); // referenceerror let x = 3; function hoisting in the case of functions, only function declarations are hoisted—but not the function expressions. /* function declaration */ foo(); // "bar" function foo() { console.log('bar'); } /* function expression */ baz(); // typeerror: baz is not a function var baz = function() { console.log('bar2'); }; global variables global variables are in fact properties of the global object. in web pages, the global object is window, so you can set and access global variables using the window.variable syntax. consequently, you can access global variables declared in one window or frame from another window or frame by specify...
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TypeError: "x" is not a function - JavaScript
some code expects you to provide a function, but that didn't happen. ...
...some code expects you to provide a function, but that didn't happen. ...
...some code expects you to provide a function, but that didn't happen. ...
...And 17 more matches

Properly configuring server MIME types - Learn web development
this article may contain out of date information, as it has not been significantly updated in many years. background by default, many web servers are configured to report a mime type of text/plain or application/octet-stream for unknown content types. as new content types are invented or added to web servers, web administrators may fail to add the new mime types to their web server's configuration. this is a major source of problems for users of gecko-based browsers, which respect the mime types as reported by web servers and web applications. what are mime types? mime types describe the media type of content either in email or served by web servers or web applications and are intended to help guide a web browser in how the content is to be processed and displayed. examples of mi...
...ation. this is a major source of problems for users of gecko-based browsers, which respect the mime types as reported by web servers and web applications. what are mime types? mime types describe the media type of content either in email or served by web servers or web applications and are intended to help guide a web browser in how the content is to be processed and displayed. examples of mime types are: text/html for normal web pages text/plain for plain text text/css for cascading style sheets text/javascript for scripts application/octet-stream meaning "download this file" application/x-java-applet for java applets application/pdf for pdf documents technical background registered values for mime types are available in iana | mime media types. the http specification defines a ...
...for plain text text/css for cascading style sheets text/javascript for scripts application/octet-stream meaning "download this file" application/x-java-applet for java applets application/pdf for pdf documents technical background registered values for mime types are available in iana | mime media types. the http specification defines a superset of mime which is used to describe the media types used on the web. why are correct mime types important? if the web server or application reports an incorrect mime type for content, a web browser has no way, according to the http specification, of knowing that the author actually intended the content to be processed and displayed in a way different from that implied by the reported mime type. some other web browsers, such as microsoft® int...
...And 16 more matches

list-style-type - CSS: Cascading Style Sheets
moreover, because this property is inherited, it can be set on a parent element (commonly <ol> or <ul>) to make it apply to all list items. ...
...ive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. the color of the marker will be the same as the computed color of the element it applies to. only a few elements (<li> and <summary>) have a default value of display: list-item. ...
... color of the element it applies to. only a few elements (<li> and <summary>) have a default value of display: list-item. however, the list-style-type property may be applied to any element whose display value is set to list-item. moreover, because this property is inherited, it can be set on a parent element (commonly <ol> or <ul>) to make it apply to all list items. ...
...And 16 more matches

<input type="date"> - HTML: Hypertext Markup Language
<input> elements of type="date" create input fields that let the user enter a date, either with a textbox that validates the input or a special date picker interface. the resulting value includes the year, month, and day, but not the time. the time and datetime-local input types support time and date+time input. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. the input ui generally varies from browser to browser; see browser compatibility for further details. in unsupported browsers, the control degrades gracefully to <input type="text">. among browsers with custom interfaces for selecting dates are chrome and ope...
...tributes list, value, valueasdate, valueasnumber. methods select(), stepdown(), stepup() value a domstring representing the date entered in the input. the date is formatted according to iso8601, described in format of a valid date string in date and time formats used in html. you can set a default value for the input with a date inside the value attribute, like so: <input type="date" value="2017-06-01"> the displayed date format will differ from the actual value — the displayed date is formatted based on the locale of the user's browser, but the parsed value is always formatted yyyy-mm-dd. you can get and set the date value in javascript with the input element's value and valueasnumber properties. for example: var datecontrol = document.queryselector('input[ty...
...it then reads that value back in string and number formats. ...
...And 16 more matches

<input type="text"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. value a domstring representing the text contained in the text field. events change and input supported common attributes autocomplete, list, maxlength, minlength, pattern, placeholder, readonly, required and size idl attributes list, value methods select(), setrangetext() and setselectionrange(). value the value attribute is a domstring that contains the current value of the text entered into the text field. ...
...s the current value of the text entered into the text field. you can retrieve this using the value property in javascript. let thetext = mytextinput.value; if no validation constraints are in place for the input (see validation for more details), the value may be an empty string (""). ...
...llcheck controls whether or not to enable spell checking for the input field, or if the default spell checking configuration should be used list the values of the list attribute is the id of a <datalist> element located in the same document. the <datalist> provides a list of predefined values to suggest to the user for this input. any values in the list that are not compatible with the type are not included in the suggested options. the values provided are suggestions, not requirements: users can select from this predefined list or provide a different value. maxlength the maximum number of characters (as utf-16 code units) the user can enter into the text input. this must be an integer value 0 or higher. if no maxlength is specified, or an invalid value is specified, the text inpu...
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Intl.DateTimeFormat.prototype.formatToParts() - JavaScript
the intl.datetimeformat.prototype.formattoparts() method allows locale-aware formatting of strings produced by datetimeformat formatters. syntax datetimeformat.formattoparts(date) parameters date optional the date to format. return value an array of objects containing the formatted date in parts. description the formattoparts() method is useful for custom formatting of date strings. it returns an array of objects containing the locale-specific tokens from which it possible to build custom strings while preserving the locale-specific parts. the structure the formattoparts() method returns, looks like this: [ { type: 'day', value: '17' }, { type: 'weekday', value: 'monday' } ] possible types are the following: day the string used for the day, for example "17". dayperiod ...
... hour12: true, timezone: 'utc' }); formatter.format(date); // "monday, 12/17/2012, 3:00:42.000 am" however, in many user interfaces there is a desire to customize the formatting of this string. ...
...matter.format(date); // "monday, 12/17/2012, 3:00:42.000 am" however, in many user interfaces there is a desire to customize the formatting of this string. ...
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nsMsgFolderFlagType
defined in comm-central/ mailnews/ base/ public/ nsmsgfolderflags.idl typedef unsigned long nsmsgfolderflagtype; /// flags about a folder or a newsgroup. [scriptable,uuid(fbe7cba8-3141-4c44-9660-99af6b53f27e)] interface nsmsgfolderflags { /** * @name folder type flags * these flags define the type of folder. exactly one will be set. * @{ */ /// this folder is a newsgroup folder. const nsmsgfolderflagtype newsgroup = 0x00000001; /// this folder is a news server. const nsmsgfolderflagtype newshost = 0x00000002; /// this folder is a mail folder. ...
... interface nsmsgfolderflags { /** * @name folder type flags * these flags define the type of folder. exactly one will be set. * @{ */ /// this folder is a newsgroup folder. const nsmsgfolderflagtype newsgroup = 0x00000001; /// this folder is a news server. const nsmsgfolderflagtype newshost = 0x00000002; /// this folder is a mail folder. const nsmsgfolderflagtype mail = 0x00000004; /** @} */ /** whether this is a directory: newshosts are always directories; * newsgroups can be directories if we are in ``show all groups'' mode; * mail folders will have this bit if they are really directories, not files. ...
...er is a mail folder. const nsmsgfolderflagtype mail = 0x00000004; /** @} */ /** whether this is a directory: newshosts are always directories; * newsgroups can be directories if we are in ``show all groups'' mode; * mail folders will have this bit if they are really directories, not files. * (note that directories may have zero children.) */ const nsmsgfolderflagtype directory = 0x00000008; /** whether the children of this folder are currently hidden in the listing. * this will only be present if the nsmsgfolderflags::directory bit is on. ...
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ArrayType
arraytype represents c arrays syntax returns a new ctype representing an array data type. ctype arraytype() type[ length] ); parameters type: it represents the type of the elements or variable which is going to be present in an array length optional it denotes the number of entries present in an array or the number of elements that an array should contain. if you don't specify this parameter, the array's length is unspecified. return value a ctype represents the newly declared array type. exceptions thrown typeerror type is not a ctype, or type.size is undefined.if the length is specifed but if it is not a valid one,then it is also thrown rangeerror the size of the resulting array can't be represented as both a size_t and as a javascript number. propertie...
...rray's length is unspecified. return value a ctype represents the newly declared array type. exceptions thrown typeerror type is not a ctype, or type.size is undefined.if the length is specifed but if it is not a valid one,then it is also thrown rangeerror the size of the resulting array can't be represented as both a size_t and as a javascript number. properties property type description elementtype ctype the data type of the elements in an array type. read only. length number the number of elements in the array, or undefined if the array type doesn't have a specified length. read only. properties inherited from ctype these properties are available on all ctype objects. ...
...operties property type description elementtype ctype the data type of the elements in an array type. read only. length number the number of elements in the array, or undefined if the array type doesn't have a specified length. read only. properties inherited from ctype these properties are available on all ctype objects. property type description name string the type's name. read only. for primitive types, this is just the name of the corresponding c type. for structure and opaque pointer types, this is simply the string that was passed to the constructor. for other function, pointer, and array types, this should be a valid c type expression. ...
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js-ctypes reference
see library.declare() for instructions on how to declare these functions. ...
...see library.declare() for instructions on how to declare these functions. ...
...see library.declare() for instructions on how to declare these functions. ...
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<input type="button"> - HTML: Hypertext Markup Language
given that a <button>’s label text is inserted between the opening and closing tags, you can include html in the label, even images. ...
...to control custom functionality anywhere on a webpage as required when assigned an event handler function (typically for the click event). the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. ...
...: while <input> elements of type button are still perfectly valid html, the newer <button> element is now the favored way to create buttons. given that a <button>’s label text is inserted between the opening and closing tags, you can include html in the label, even images. value a domstring used as the button's label events click supported common attributes type, and value idl attributes value methods none value an <input type="button"> elements' value attribute contains a domstring that is used as the button's label. ...
...And 15 more matches

lang/type - Archive of obsolete content
functions for working with type detection. globals functions isundefined(value) returns true if value is undefined, false otherwise. let { isundefined } = require('sdk/lang/type'); var foo; isundefined(foo); // true isundefined(0); // false parameters value : mixed the variable to check. returns boolean : boolean indicating if value is undefined. isnull(value) returns true if value is null, false otherwise. let { isnull } = require('sdk/lang/type'); isnull(null); // true isnull(false); // false parameters value : mixed the variable to check. returns boolean : boolean indicating if value is null. isstring(value) returns true if value is a string, false otherwise. ...
...returns boolean : boolean indicating if value is undefined. isnull(value) returns true if value is null, false otherwise. let { isnull } = require('sdk/lang/type'); isnull(null); // true isnull(false); // false parameters value : mixed the variable to check. returns boolean : boolean indicating if value is null. isstring(value) returns true if value is a string, false otherwise. uses typeof operator to check type, and will only properly detect string primitives: for example, a string created with new string() will always return false. let { isstring } = require('sdk/lang/type'); isstring('my string'); // true isstring(100); // false isstring('100'); // true parameters value : mixed the variable to check. returns boolean : boolean indicating if value is a string. isnumber(v...
...primitives: for example, a string created with new string() will always return false. let { isstring } = require('sdk/lang/type'); isstring('my string'); // true isstring(100); // false isstring('100'); // true parameters value : mixed the variable to check. returns boolean : boolean indicating if value is a string. isnumber(value) returns true if value is a number, false otherwise. uses typeof operator to check type, and will only properly detect number primitives: for example, a number created with new number() will always return false. let { isnumber } = require('sdk/lang/type'); isnumber(3.1415); // true isnumber(100); // true isnumber('100'); // false parameters value : mixed the variable to check. returns boolean : boolean indicating if value is a number. isregexp(value)...
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How Mozilla determines MIME Types
introduction all data handling in mozilla is based on the mime type of the content. this means that every time an uri is loaded, mozilla must find out its mime type. the several ways how this happens are described in this document. content-type "hints" mozilla has a concept of "content-type hints". this means that, for example, if mozilla encounters a <link type="text/css" rel="stylesheet" href="..."> element, a type of text/css will be assumed. this is, however, overridden by the actual mime type the server sends (if any). (for this specific example, the server override only happens in standards-compliant mode. see mozilla's quirks mode or web author faq). similar handling happens for <a href="..." type="foo/bar">, starting in mozilla 1.6alpha. http for http uris mozilla usually...
...lement, a type of text/css will be assumed. this is, however, overridden by the actual mime type the server sends (if any). (for this specific example, the server override only happens in standards-compliant mode. see mozilla's quirks mode or web author faq). similar handling happens for <a href="..." type="foo/bar">, starting in mozilla 1.6alpha. http for http uris mozilla usually gets a mime type sent from the server, and uses it. contrary to internet explorer's mime type guessing, mozilla will generally not sniff the type of the document. ...
... faq). similar handling happens for <a href="..." type="foo/bar">, starting in mozilla 1.6alpha. http for http uris mozilla usually gets a mime type sent from the server, and uses it. contrary to internet explorer's mime type guessing, mozilla will generally not sniff the type of the document. however, starting in mozilla 1.7alpha, mozilla does do content sniffing, like this: when the content-type sent by the server is one of (case-sensitively) text/plain text/plain; charset=iso-8859-1 text/plain; charset=iso-8859-1 and the server did not send a content-encoding header, mozilla will sniff the first block of data it gets and check for non-text bytes. text bytes are 9-13, 27, and 31-255. ...
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ValidityState.typeMismatch - Web APIs
a valid email address includes an email prefix and a domain, with or without a top level domain. ...
...a valid email address includes an email prefix and a domain, with or without a top level domain. ...
...a valid email address includes an email prefix and a domain, with or without a top level domain. ...
...And 14 more matches

Link types - HTML: Hypertext Markup Language
in html, link types indicate the relationship between two documents, in which one links to the other using an <a>, <area>, <form>, or <link> element. list of the defined link types and their significance in html link type description allowed in these elements not allowed in these elements alternate if the element is <link> and the rel attribute also contains the stylesheet type, the link defines an alternative style sheet; in that case the title attribute must be present and not be the empty string. if the type is set to application/rss+xml or application/atom+xml, the link defines a syndication feed. the first one defined on the page is the default. ...
...el attribute also contains the stylesheet type, the link defines an alternative style sheet; in that case the title attribute must be present and not be the empty string. if the type is set to application/rss+xml or application/atom+xml, the link defines a syndication feed. the first one defined on the page is the default. ...
...on/rss+xml or application/atom+xml, the link defines a syndication feed. the first one defined on the page is the default. otherwise, the link defines an alternative page, of one of these types: for another medium, like a handheld device (if the media attribute is set) in another language (if the hreflang attribute is set), in another format, such as a pdf (if the type attribute is set) a combination of these <a>, <area>, <link> <form> archives defines a hyperlink to a document that contains an archive link to this one. for example, a blog entry could link to a monthly index page this way. note: although recognized, the singular archive is incorrect and must be avoided. <a>, <area>, <link> <form> ...
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<input type="radio"> - HTML: Hypertext Markup Language
only one radio button in a given group can be selected at the same time. radio buttons are typically rendered as small circles, which are filled or highlighted when selected. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. they are called radio buttons because they look and operate in a similar manner to the push buttons on old-fashioned radios, such as the one shown below. ...
... preferred contact method, you might create three radio buttons, each with the name property set to contact but one with the value email, one with the value phone, and one with the value mail. the user never sees the value or the name (unless you expressly add code to display it). ...
...alue email, one with the value phone, and one with the value mail. the user never sees the value or the name (unless you expressly add code to display it). ...
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JavaScript typed arrays - JavaScript
javascript typed arrays are array-like objects that provide a mechanism for reading and writing raw binary data in memory buffers. as you may already know, array objects grow and shrink dynamically and can have any javascript value. javascript engines perform optimizations so that these arrays are fast. however, as web applications become more and more powerful, adding features such as audio and video manipulation, access to raw data using websockets, and so forth, it has become clear that there are times when it would be helpful for javascript code to be able to quickly and easily manipulate raw binary data. this is where typed arrays come in. ...
... these arrays are fast. however, as web applications become more and more powerful, adding features such as audio and video manipulation, access to raw data using websockets, and so forth, it has become clear that there are times when it would be helpful for javascript code to be able to quickly and easily manipulate raw binary data. this is where typed arrays come in. ...
...access to raw data using websockets, and so forth, it has become clear that there are times when it would be helpful for javascript code to be able to quickly and easily manipulate raw binary data. this is where typed arrays come in. each entry in a javascript typed array is a raw binary value in one of a number of supported formats, from 8-bit integers to 64-bit floating-point numbers. however, typed arrays are not to be confused with normal arrays, as calling array.isarray() on a typed array returns false. moreover, not all methods available for normal arrays are supported by typed arrays (e.g. push and pop). buffers and views: typed array architecture to achieve maximum flexibility and efficiency, javascript typed arrays split the implementation into buffers and views. a buffer (implemen...
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Object.prototype.__proto__ - JavaScript
warning: changing the [[prototype]] of an object is, by the nature of how modern javascript engines optimize property accesses, a very slow operation, in every browser and javascript engine. the effects on the performance of altering inheritance are subtle and far-flung, and are not limited to simply the time spent in obj.__proto__ = ... statements, but may extend to any code that has access to any object whose [[prototype]] has been altered. if you care about performance you should avoid setting the [[prototype]] of an object. instead, create a new object with the desired [[prototype]] using object.create(). ...
...re subtle and far-flung, and are not limited to simply the time spent in obj.__proto__ = ... statements, but may extend to any code that has access to any object whose [[prototype]] has been altered. if you care about performance you should avoid setting the [[prototype]] of an object. instead, create a new object with the desired [[prototype]] using object.create(). warning: while object.prototype.__proto__ is supported today in most browsers, its existence and exact behavior has only been standardized in the ecmascript 2015 specification as a legacy feature to ensure compatibility for web browsers. ...
... the use of __proto__ is controversial and discouraged. ...
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Reflect.getPrototypeOf() - JavaScript
the static reflect.getprototypeof() method is almost the same method as object.getprototypeof(). it returns the prototype (i.e. the value of the internal [[prototype]] property) of the specified object. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax reflect.getprototypeof(target) parameters target the target object of which to get the prototype. return value the prototype of the given object. if there are no inherited properties, null is returned. exceptions a typeerror, if target is not an object. description the reflect.getprototypeof method returns the prototype (i.e. the value of the intern...
... a pull request. syntax reflect.getprototypeof(target) parameters target the target object of which to get the prototype. return value the prototype of the given object. if there are no inherited properties, null is returned. exceptions a typeerror, if target is not an object. description the reflect.getprototypeof method returns the prototype (i.e. the value of the internal [[prototype]] property) of the specified object. ...
...rget the target object of which to get the prototype. return value the prototype of the given object. if there are no inherited properties, null is returned. exceptions a typeerror, if target is not an object. description the reflect.getprototypeof method returns the prototype (i.e. the value of the internal [[prototype]] property) of the specified object. ...
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RTCIceCandidateStats.networkType - Web APIs
the permitted values are: bluetooth a bluetooth connection is used by the described connection. ...
... the permitted values are: bluetooth a bluetooth connection is used by the described connection. ...
... the permitted values are: bluetooth a bluetooth connection is used by the described connection. ...
...And 11 more matches

OpenType font features guide - CSS: Cascading Style Sheets
font features or variants refer to different glyphs or character styles contained within an opentype font. these include things like ligatures (special glyphs that combine characters like 'fi' or 'ffl'), kerning (adjustments to the spacing between specific letterform pairings), fractions, numeral styles, and a number of others. these are all referred to as opentype features, and are made available to use on the web via specific properties and a low-level control property — font-feature-settings. this article provides you with all you need to know about using opentype font features in css. some fonts will have one or more of these features enabled by default (kerning and default ligatures are common examples), while others are left to the designer or developer to choose to enable in specifi...
...uch as stylistic sets (which might include several specific variants of glyphs meant to be used together), alternates (which might be one or more variants of the letter 'a'), or even language-specific alterations for east asian languages. in the latter case, these alterations are actually necessary to properly express the language, so they go beyond the more stylistic preference of most other opentype features. caution: there are many css attributes defined to leverage font features, but unfortunately many are not fully implemented. they are all defined and shown here, but many will only work using the lower-level font-feature-settings property. it's possible to write css to work both ways but this can become cumbersome. the issue with simply using font-feature-settings for everything is tha...
...ith simply using font-feature-settings for everything is that every time you want to change one of the individual features, you have to redefine the entire string (similar to manipulating variable fonts with font-variation-settings). discovering availability of features in fonts this is sometimes the trickiest thing to work out if you don't have any documentation that came with the fonts (many type designers and foundries will provide sample pages and css just for this very reason). but there are some sites that make it easier to figure out. you can visit wakamaifondue.com, drop your font file on the circle where instructed and in a few moments you'll have a full report on all the capabilities and features of your font. axis-praxis.org also offers a similar capability, with the ability to c...
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<input type="checkbox"> - HTML: Hypertext Markup Language
the exact appearance depends upon the operating system configuration under which the browser is running. generally this is a square but it may have rounded corners. a checkbox allows you to select single values for submission in a form (or not). the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. ...
...ge and input supported common attributes checked idl attributes checked, indeterminate and value methods select() value a domstring representing the value of the checkbox. this is never seen on the client-side, but on the server this is the value given to the data submitted with the checkbox's name. take the following example: <form> <div> <input type="checkbox" id="subscribenews" name="subscribe" value="newsletter"> <label for="subscribenews">subscribe to newsletter?</label> </div> <div> <button type="submit">subscribe</button> </div> </form> in this example, we've got a name of subscribe, and a value of newsletter. when the form is submitted, the data name/value pair will be subscribe=newsletter. if the value attribute was ...
...for the checkbox is on, so the submitted data in that case would be subscribe=on. note: if a checkbox is unchecked when its form is submitted, there is no value submitted to the server to represent its unchecked state (e.g. value=unchecked); the value is not submitted to the server at all. if you wanted to submit a default value for the checkbox when it is unchecked, you could include an <input type="hidden"> inside the form with the same name and value, generated by javascript perhaps. additional attributes in addition to the common attributes shared by all <input> elements, "checkbox" inputs support the following attributes: attribute description checked boolean; if present, the checkbox is toggled on by default indeterminate a boolean which, if ...
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<input type="password"> - HTML: Hypertext Markup Language
<input> elements of type password provide a way for the user to securely enter a password. the element is presented as a one-line plain text editor control in which the text is obscured so that it cannot be read, usually by replacing each character with a symbol such as the asterisk ("*") or a dot ("•"). this character will vary depending on the user agent and os. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. ...
...ter will vary depending on the user agent and os. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. specifics of how the entry process works may vary from browser to browser; mobile devices, for example, often display the typed character for a moment before obscuring it, to allow the user to be sure they pressed the key they meant to press; this is helpful given the small size of keys and the ease with which the wrong one can be pressed, especially on virtual keyboards. note: any forms involving sensitive information like passwords (e.g. login forms) should be served over https; many browsers now implement mechanisms...
...lue passes validation; see validation for more information. note: the line feed (u+000a) and carriage return (u+000d) characters are not permitted in a password value. when setting the value of a password control, line feed and carriage return characters are stripped out of the value. ...
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itemtype - HTML: Hypertext Markup Language
the global attribute itemtype specifies the url of the vocabulary that will be used to define itemprop's (item properties) in the data structure. itemscope is used to set the scope of where in the data structure the vocabulary set by itemtype will be active. google and other major search engines support the schema.org vocabulary for structured data. this vocabulary defines a standard set of type names and property names. for example, musicevent indicates a concert performance, with startdate and location properties specifying the concert's key details. in this case, musicevent would be the url used by itemtype, with startdate and location as itemprop's which musicevent defines. ...
...chema.org vocabulary for structured data. this vocabulary defines a standard set of type names and property names. for example, musicevent indicates a concert performance, with startdate and location properties specifying the concert's key details. in this case, musicevent would be the url used by itemtype, with startdate and location as itemprop's which musicevent defines. note: more about itemtype attributes can be found at http://schema.org/thing the itemtype attribute must have a value that is an unordered set of unique tokens which are case-sensitive, each is a valid and absolute url, and all defined to use the same vocabulary. the attribute's value must have at least one token. ...
...with startdate and location as itemprop's which musicevent defines. note: more about itemtype attributes can be found at http://schema.org/thing the itemtype attribute must have a value that is an unordered set of unique tokens which are case-sensitive, each is a valid and absolute url, and all defined to use the same vocabulary. the attribute's value must have at least one token. the item types must all be types defined in applicable specifications (such as schema.org), and must all be defined to use the same vocabulary. the itemtype attribute can only be specified on elements which have an itemscope attribute specified. the itemid attribute can only be specified on elements which have both an itemscope attribute and an itemtype attribute specified. they must only be specified on ele...
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TypedArray.from() - JavaScript
the typedarray.from() method creates a new typed array from an array-like or iterable object. this method is nearly the same as array.from(). the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax typedarray.from(source[, mapfn[, thisarg]]) where typedarray is one of: int8array uint8array uint8clampedarray int16array uint16array int32array uint32array float32array float64array bigint64array biguint64array parameters source an array-like or iterable object to convert to a typed array. mapfn optional map function to call on every element of the typed array. thisarg optional value to use a...
... int8array uint8array uint8clampedarray int16array uint16array int32array uint32array float32array float64array bigint64array biguint64array parameters source an array-like or iterable object to convert to a typed array. mapfn optional map function to call on every element of the typed array. thisarg optional value to use as this when executing mapfn. return value a new typedarray instance. ...
...mpedarray int16array uint16array int32array uint32array float32array float64array bigint64array biguint64array parameters source an array-like or iterable object to convert to a typed array. mapfn optional map function to call on every element of the typed array. thisarg optional value to use as this when executing mapfn. return value a new typedarray instance. description typedarray.from() lets you create typed arrays from: array-like objects (objects with a length property and indexed elements); or iterable objects (objects where you can get its elements, such as map and set). typedarray.from() has the optional parameter mapfn, which allows you to execute a map() function on each element of the typed array (or subclass object) that is being created. this means t...
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JS_GetTypeName
obsolete since jsapi 34this feature is obsolete. although it may still work in some browsers, its use is discouraged since it could be removed at any time. try to avoid using it. returns a pointer to the string literal description of a specified js data type. syntax const char * js_gettypename(jscontext *cx, jstype type); name type description cx jscontext * pointer to a js context from which to derive runtime information. ...
...l work in some browsers, its use is discouraged since it could be removed at any time. try to avoid using it. returns a pointer to the string literal description of a specified js data type. syntax const char * js_gettypename(jscontext *cx, jstype type); name type description cx jscontext * pointer to a js context from which to derive runtime information. type jstype one of jstype_void, jstype_object, jstype_function, jstype_string, jstype_number, or jstype_boolean. ...
...literal description of a specified js data type. syntax const char * js_gettypename(jscontext *cx, jstype type); name type description cx jscontext * pointer to a js context from which to derive runtime information. type jstype one of jstype_void, jstype_object, jstype_function, jstype_string, jstype_number, or jstype_boolean. description js_gettypename returns a pointer to a string literal description of a specified js data type, type. ...
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PerformanceEntry.entryType - Web APIs
resource performanceresourcetiming url the resolved url of the requested resource. ...
... resource performanceresourcetiming url the resolved url of the requested resource. ...
... resource performanceresourcetiming url the resolved url of the requested resource. ...
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StructType
structtype represents c structures. syntax returns a ctype object describing a new structure data type. this data type provides the ability to define and manipulate values of the c struct type. note: at this time, there isn't a way to denote a packed structure (that is, one created in c using #pragma pack). ctype structtype( name[, fields] ); parameters name the name of the structure. must be a string. fields optional an array of field descriptors, describing all the entries in the structure. if this isn't specified, the structure is considered opaque and you can't access its contents directly. you can call the resulting type's define() method to assign it a non-opaque type later. see opaque structures for further explanation and an example. ...
...the structure. must be a string. fields optional an array of field descriptors, describing all the entries in the structure. if this isn't specified, the structure is considered opaque and you can't access its contents directly. you can call the resulting type's define() method to assign it a non-opaque type later. see opaque structures for further explanation and an example. return value a ctype object describing the newly created struct data type. exceptions thrown typeerror the name is not a string, or one or more of the fields does not have a defined size. rangeerror the size of the structure, in bytes, cannot be represented both as a size_t and as a javascript number. describing fields the fields array is comprised of field descriptors, one for each field in the structure. ...
...exceptions thrown typeerror the name is not a string, or one or more of the fields does not have a defined size. rangeerror the size of the structure, in bytes, cannot be represented both as a size_t and as a javascript number. describing fields the fields array is comprised of field descriptors, one for each field in the structure. each field descriptor contains the field's name and its type, such as {'serialnumber': ctypes.int}. a complete field descriptor list might look like this: [ {'serialnumber': ctypes.int}, {'username': ctypes.char.ptr} ] properties property type description fields ctype[] a sealed array of field descriptors. read only. properties inherited from ctype these properties are available on all ctype objects. prop...
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PerformanceObserverEntryList.getEntriesByType() - Web APIs
the items will be in chronological order based on the entries' starttime. ...
...the items will be in chronological order based on the entries' starttime. ...
...the items will be in chronological order based on the entries' starttime. ...
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RTCIceServer.credentialType - Web APIs
this process is detailed in rfc 7635. this property was formerly called token. ...
...this process is detailed in rfc 7635. this property was formerly called token. ...
...this process is detailed in rfc 7635. this property was formerly called token. ...
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TextEncoder.prototype.encodeInto() - Web APIs
this is potentially more performant than the older encode() method especially when the target buffer is a view into a wasm heap. syntax b1 = encoder.encodeinto(string, uint8array); parameters string is a usvstring containing the text to encode. uint8array is a uint8array object instance to place the resulting utf-8 encoded text into. return value a textencoderencodeintoresult dictionary, which contains two members: read the number of utf-16 units of code from the source that has been converted over to utf-8. ...
...an string.length if uint8array did not have enough space. written the number of bytes modified in the destination uint8array. the bytes written are guaranteed to form complete utf-8 byte sequences. encode into a specific position encoder.encodeinto always puts its output at the start of the array. however, it is sometimes useful to make the output start at a particular index. the solution is typedarray.prototype.subarray(). observe. var encoder = new textencoder; function encodeintoatposition(string, u8array, position) { return encoder.encodeinto(string, position ? u8array.subarray(position|0) : u8array); } var u8array = new uint8array(8); encodeintoatposition("hello", u8array, 2); console.log( "" + u8array.join() ); // 0,0,104,101,108,108,111,0 buffer sizing to convert a javascr...
...t8array(string.length); let encodedresults = textencoder.encodeinto(string, utf8); resultpara.textcontent += 'bytes read: ' + encodedresults.read + ' | bytes written: ' + encodedresults.written + ' | encoded result: ' + utf8; polyfill the polyfill below may be a bit long because of the switch cases and utilization of native textencoder.prototype.encode in safari when available, but it is well worth the length because of the gains in performance. (function(window){ "use strict"; var log = math.log; var ln2 = math.ln2; var clz32 = math.clz32 || function(x) {return 31 - log(x >>> 0) / ln2 | 0}; var fromcharcode = string.fromcharcode; var patchedu8array = window.uint8array || array; var textencoderprototype = tex...
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<input type="submit"> - HTML: Hypertext Markup Language
<input> elements of type submit are rendered as buttons. when the click event occurs (typically because the user clicked the button), the user agent attempts to submit the form to the server. <input type="submit" value="send request"> value a domstring used as the button's label events click supported common attributes type and value idl attributes value methods none value an <input type="submit"> element's value attribute contains a domstring which is displayed as the button's label. buttons do not have a true value otherwise. <input type="submit" value="send request"> if you don't specify a value, the button will have a default label, chosen by the user agent. this label is likely to be something along the lines...
...ng which is displayed as the button's label. buttons do not have a true value otherwise. <input type="submit" value="send request"> if you don't specify a value, the button will have a default label, chosen by the user agent. ...
...xample of a submit button with a default label in your browser: <input type="submit"> additional attributes in addition to the attributes shared by all <input> elements, submit button inputs support the following attributes: attribute description formaction the url to which to submit the form's data; overrides the form's action attribute, if any formenctype a string specifying the encoding type to use for the form data formmethod the http method (get or post) to use when submitting the form. formnovalidate a boolean which, if present, means the form's fields will not be subjected to constraint validation before submitting the data to the server formtarget the browsing context into which to load the response ret...
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Content-Type - HTTP
the content-type entity header is used to indicate the media type of the resource. in responses, a content-type header tells the client what the content type of the returned content actually is. browsers will do mime sniffing in some cases and will not necessarily follow the value of this header; to prevent this behavior, the header x-content-type-options can be set to nosniff. in requests, (such as post or put), the client tells the server what type of data is actually sent. ...
...content-type header tells the client what the content type of the returned content actually is. browsers will do mime sniffing in some cases and will not necessarily follow the value of this header; to prevent this behavior, the header x-content-type-options can be set to nosniff. in requests, (such as post or put), the client tells the server what type of data is actually sent. header type entity header forbidden header name no cors-safelisted response header yes cors-safelisted request header yes, with the additional restriction that values can't contain a cors-unsafe request header byte: 0x00-0x1f (except 0x08 (tab)), "():<>?@[\]{}, and 0x7f (delete). ...
... charset the character encoding standard. ...
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Warning: String.x is deprecated; use String.prototype.x instead - JavaScript
the javascript warning about string generics occurs in firefox versions prior to 68. string generics have been removed starting with firefox 68. ...
... the javascript warning about string generics occurs in firefox versions prior to 68. string generics have been removed starting with firefox 68. ...
...pt warning about string generics occurs in firefox versions prior to 68. string generics have been removed starting with firefox 68. ...
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TypeError: invalid 'instanceof' operand 'x' - JavaScript
the instanceof operator expects the right hand side operands to be a constructor object, i.e. ...
... the instanceof operator expects the right hand side operands to be a constructor object, i.e. ...
... the instanceof operator expects the right hand side operands to be a constructor object, i.e. ...
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Object.prototype.toString() - JavaScript
epresenting the object. description every object has a tostring() method that is automatically called when the object is to be represented as a text value or when an object is referred to in a manner in which a string is expected. by default, the tostring() method is inherited by every object descended from object. if this method is not overridden in a custom object, tostring() returns "[object type]", where type is the object type. the following code illustrates this: const o = new object(); o.tostring(); // returns [object object] note: starting in javascript 1.8.5, tostring() called on null returns [object null], and undefined returns [object undefined], as defined in the 5th edition of ecmascript and subsequent errata. see using tostring() to detect object class. parameters for ...
...r hexadecimal numbers. examples overriding the default tostring method you can create a function to be called in place of the default tostring() method. the tostring() method takes no arguments and should return a string. the tostring() method you create can be any value you want, but it will be most useful if it carries information about the object. ...
...rriding the default tostring method you can create a function to be called in place of the default tostring() method. the tostring() method takes no arguments and should return a string. the tostring() method you create can be any value you want, but it will be most useful if it carries information about the object. ...
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CType
all data types declared using the js-ctypes api are represented by ctype objects. these objects have assorted methods and properties that let you create objects of these types, find out information about them, and so forth. the specific properties and methods on each object vary depending on the data type represented. there are several kinds of types: primitive types these are typical unstructured data, such as the predefined types listed in predefined data types. big integer types the int64 and uint64 types provide access to 64-bit integer values, which javascript doesn't currently support. pointertype these represent pointers to data in memory. functiontype these represent callable c functions. structtype these represent c structures. arraytype these represent c arrays. met...
...sted in predefined data types. big integer types the int64 and uint64 types provide access to 64-bit integer values, which javascript doesn't currently support. pointertype these represent pointers to data in memory. functiontype these represent callable c functions. structtype these represent c structures. arraytype these represent c arrays. method overview methods available on all ctype objects ctype array([n]) string tosource() string tostring() properties properties of all ctype objects these properties are available on all ctype objects. property type description name string the type's name. read only. for primitive types, this is just the name of the corresponding c type. for structure and opaque p...
...s ctype array([n]) string tosource() string tostring() properties properties of all ctype objects these properties are available on all ctype objects. property type description name string the type's name. read only. for primitive types, this is just the name of the corresponding c type. for structure and opaque pointer types, this is simply the string that was passed to the constructor. for other function, pointer, and array types, this should be a valid c type expression. ptr ctype returns a ctype representing the data type "pointer to this type". this is the result of calling ctypes.pointertype(the_type). read only. size number the size of the type, in bytes. this is the same...
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Using the CSS Typed Object Model - Web APIs
the css typed object model api exposes css values as typed javascript objects to allow their performant manipulation. converting css object model value strings into meaningfully-typed javascript representations and back (via htmlelement.style) can incur a significant performance overhead. the css typed om makes css manipulation more logical and performant by providing object features (rather than cssom string manipulation), providing access to types, methods, and an object model for css values. this article provides an introduction to all of its main features. computedstylemap() with the css typed om api, we can access all the css properties and values — including custom properties — that are impacting an element. let's see how this works by creating our first example, which ...
...r: red , are properties. as such, they are accessible via get(). you'll note that custom properties retain the value as written in the stylesheet, whereas computed styles will be listed as the computed value — color was listed as an rgb() value and the font-weight returned was 700 even though we use a named color and and the bold keyword. cssunitvalue and csskeywordvalue the power of the css typed om is that values are separate from units; parsing and concatenating string values may become be a thing of the past. every css property in a style map has a value. if the value is a keyword, the object returned is a csskeywordvalue. if the value is numeric, a cssunitvalue is returned. csskeywordvalue is a class that defines keywords like inherit, initial, unset, and other strings you don't quo...
...style map has a value. if the value is a keyword, the object returned is a csskeywordvalue. if the value is numeric, a cssunitvalue is returned. csskeywordvalue is a class that defines keywords like inherit, initial, unset, and other strings you don't quote, such as auto and grid. this subclass gives you a value property via csskeywordvalue.value. cssunitvalue is returned if the value is a unit type. it is a class that defines numbers with units of measurement like 20px, 40%, 200ms, or 7. it is returned with two properties: a value and a unit. with this type we can access the numeric value — cssunitvalue.value — and its unit — cssunitvalue.unit. let's write a plain paragraph, apply no styles, and inspect a few of its css properties by returning a table with the unit and value: <p> ...
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Node.nodeType - Web APIs
node.text_node 3 the actual text inside an element or attr. node.cdata_section_node 4 a cdatasection, such as <!cdata[[ … ]]>. node.processing_instruction_node 7 a processinginstruction of an xml document, such as <?xml-stylesheet … ?>. ...
... node.text_node 3 the actual text inside an element or attr. node.cdata_section_node 4 a cdatasection, such as <!cdata[[ … ]]>. node.processing_instruction_node 7 a processinginstruction of an xml document, such as <?xml-stylesheet … ?>. ...
... node.text_node 3 the actual text inside an element or attr. node.cdata_section_node 4 a cdatasection, such as <!cdata[[ … ]]>. node.processing_instruction_node 7 a processinginstruction of an xml document, such as <?xml-stylesheet … ?>. ...
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mask-type - CSS: Cascading Style Sheets
values luminance is a keyword indicating that the associated mask image is a luminance mask, i.e., that its relative luminance values must be used when applying it. ...
... values luminance is a keyword indicating that the associated mask image is a luminance mask, i.e., that its relative luminance values must be used when applying it. ...
... values luminance is a keyword indicating that the associated mask image is a luminance mask, i.e., that its relative luminance values must be used when applying it. ...
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Array.prototype.reduceRight() - JavaScript
the reduceright() method applies a function against an accumulator and each value of the array (from right-to-left) to reduce it to a single value. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. see also array.prototype.reduce() for left-to-right. syntax arr.reduceright(callback(accumulator, currentvalue[, index[, array]])[, initialvalue]) parameters callback function to execute on each value in the array, taking four arguments: accumulator the value previously returned in the last invocation of the callback, or initialvalue, if supplied. (see below.) currentvalue the current element being processe...
...indexoptional the index of the current element being processed in the array. arrayoptional the array reduceright() was called upon. initialvalueoptional value to use as accumulator to the first call of the callback. if no initial value is supplied, the last element in the array will be used and skipped. calling reduce or reduceright on an empty array without an initial value creates a typeerror. return value the value that results from the reduction. description reduceright executes the callback function once for each element present in the array, excluding holes in the array, receiving four arguments: the initial value (or value from the previous callback call), the value of the current element, the current index, and the array over which iteration is occurring. the call to ...
...ne of two values. if an initialvalue was provided in the call to reduceright, then accumulator will be equal to initialvalue and currentvalue will be equal to the last value in the array. if no initialvalue was provided, then accumulator will be equal to the last value in the array and currentvalue will be equal to the second-to-last value. if the array is empty and no initialvalue was provided, typeerror would be thrown. if the array has only one element (regardless of position) and no initialvalue was provided, or if initialvalue is provided but the array is empty, the solo value would be returned without calling callback. some example run-throughs of the function would look like this: [0, 1, 2, 3, 4].reduceright(function(accumulator, currentvalue, index, array) { return accumulator + c...
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PR_GetDescType
pr_desc_socket_tcp the prfiledesc object represents a tcp socket. ...
... pr_desc_socket_tcp the prfiledesc object represents a tcp socket. ...
... pr_desc_socket_tcp the prfiledesc object represents a tcp socket. ...
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libmime content type handlers
warning: the content of this article may be out of date. it was imported from mozilla.org and last updated in 2001. by richard h. pizzarro <rhp@netscape.com> contents overview api's plugin location/installation sample content type handler plugin overview the libmime module implements a general-purpose mime parser and one of the primary methods provided by the parser is the ability to emit an html representation of an input stream. the primary use of libmime is to parse and render rfc822 messages for use by the messenger component of seamonkey. a necessary capability of this module is to dynamically add the ability to decode and render various content types. this functionality will be accomplished via content type handler plugins for libmime. libmime has a homegrow...
...tream. the primary use of libmime is to parse and render rfc822 messages for use by the messenger component of seamonkey. a necessary capability of this module is to dynamically add the ability to decode and render various content types. this functionality will be accomplished via content type handler plugins for libmime. libmime has a homegrown object system written in c, and since the content type handler plugins need to exist in this module, a description of the libmime object system should be reviewed and understood. api's content type handler plugins are dynamically loaded and need to access internal pointers, functions that are part of the c based object system. the following xp-com interface is implemented by libmime and is necessary for content type handler plugin development. /* ...
..., a description of the libmime object system should be reviewed and understood. api's content type handler plugins are dynamically loaded and need to access internal pointers, functions that are part of the c based object system. the following xp-com interface is implemented by libmime and is necessary for content type handler plugin development. /* * this interface is implemented by content type handlers that will be * called upon by libmime to process various attachments types. ...
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PointerType
pointertype represents c pointer. syntax returns a new ctype object describing a new pointer data type. ctype pointertype( type ); parameters type specifies the type to which the pointer type points. this can be any ctype object to declare the new type as a pointer to that type. return value a ctype object describing the newly created data type. exceptions thrown typeerror thrown if the parameter isn't a ctype. examples creating a type "pointer to 32-bit integer" looks like this: var intptrtype = new ctypes.pointertype(ctypes.int32_t); properties property type description targettype ctype the type of object the pointer points to. read only. properties inherited from ctype these properties are available on all ctype objects. ...
...sn't a ctype. examples creating a type "pointer to 32-bit integer" looks like this: var intptrtype = new ctypes.pointertype(ctypes.int32_t); properties property type description targettype ctype the type of object the pointer points to. read only. properties inherited from ctype these properties are available on all ctype objects. property type description name string the type's name. read only. for primitive types, this is just the name of the corresponding c type. for structure and opaque pointer types, this is simply the string that was passed to the constructor. for other function, pointer, and array types, this should be a valid c type expression. ...
... objects. property type description name string the type's name. read only. for primitive types, this is just the name of the corresponding c type. for structure and opaque pointer types, this is simply the string that was passed to the constructor. for other function, pointer, and array types, this should be a valid c type expression. ptr ctype returns a ctype representing the data type "pointer to this type". this is the result of calling ctypes.pointertype(the_type). read only. size number the size of the type, in bytes. this is the same value as the c sizeof. read only. note: ctypes.void_t.size is undefined. ...
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TypeError: More arguments needed - JavaScript
there is an error with how a function is called. more arguments need to be provided. ...
... there is an error with how a function is called. more arguments need to be provided. ...
... there is an error with how a function is called. more arguments need to be provided. ...
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TypeError: invalid arguments - JavaScript
the javascript exception "invalid arguments" occurs when typed array constructors are provided with a wrong argument. message typeerror: invalid arguments (firefox) error type typeerror what went wrong? ...
... the javascript exception "invalid arguments" occurs when typed array constructors are provided with a wrong argument. message typeerror: invalid arguments (firefox) error type typeerror what went wrong? ...
... the javascript exception "invalid arguments" occurs when typed array constructors are provided with a wrong argument. message typeerror: invalid arguments (firefox) error type typeerror what went wrong? ...
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Array.prototype.reduce() - JavaScript
otherwise, it starts from index 1. array optional the array reduce() was called upon. initialvalue optional a value to use as the first argument to the first call of the callback. if no initialvalue is supplied, the first element in the array will be used as the initial accumulator value and skipped as currentvalue. calling reduce() on an empty array without an initialvalue will throw a typeerror. return value the single value that results from the reduction. description the reduce() method executes the callback once for each assigned value present in the array, taking four arguments: accumulator currentvalue currentindex array the first time the callback is called, accumulator and currentvalue can be one of two values. if initialvalue is provided in the call to reduce()...
...in the array. if no initialvalue is provided, then accumulator will be equal to the first value in the array, and currentvalue will be equal to the second. note: if initialvalue is not provided, reduce() will execute the callback function starting at index 1, skipping the first index. if initialvalue is provided, it will start at index 0. ...
...ndex 0. if the array is empty and no initialvalue is provided, typeerror will be thrown. if the array only has one element (regardless of position) and no initialvalue is provided, or if initialvalue is provided but the array is empty, the solo value will be returned without calling callback. ...
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Object.prototype.valueOf() - JavaScript
cted. by default, the valueof method is inherited by every object descended from object. every built-in core object overrides this method to return an appropriate value. if an object has no primitive value, valueof returns the object itself. you can use valueof within your own code to convert a built-in object into a primitive value. when you create a custom object, you can override object.prototype.valueof() to call a custom method instead of the default object method. overriding valueof for custom objects you can create a function to be called in place of the default valueof method. your function must take no arguments. suppose you have an object type mynumbertype and you want to create a valueof method for it. the following code assigns a user-defined function to the object's valueof m...
...ll a custom method instead of the default object method. overriding valueof for custom objects you can create a function to be called in place of the default valueof method. your function must take no arguments. suppose you have an object type mynumbertype and you want to create a valueof method for it. the following code assigns a user-defined function to the object's valueof method: mynumbertype.prototype.valueof = function() { return customprimitivevalue; }; with the preceding code in place, any time an object of type mynumbertype is used in a context where it is to be represented as a primitive value, javascript automatically calls the function defined in the preceding code. an object's valueof method is usually invoked by javascript, but you can invoke it yourself as follows: mynum...
...ototype.valueof = function() { return customprimitivevalue; }; with the preceding code in place, any time an object of type mynumbertype is used in a context where it is to be represented as a primitive value, javascript automatically calls the function defined in the preceding code. an object's valueof method is usually invoked by javascript, but you can invoke it yourself as follows: mynumbertype.valueof() note: objects in string contexts convert via the tostring() method, which is different from string objects converting to string primitives using valueof. all objects have a string conversion, if only "[object type]". but many objects do not convert to number, boolean, or function. ...
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mimeTypes.rdf corruption - SVG: Scalable Vector Graphics
symptoms previously you were able to open and display svg content with mozilla, but for no apparent reason its behaviour changes and now it always pops up the "open or save file" dialog when you try to open local svg files, and displays the "additional plugins are required to display all the media on this page" bar when you try to view html with embedded svg. ...
...for legitimate reasons when the svg or its embedding html is broken or served incorrectly over the network (see the svg faq). if the blue square with the white cross displays when you load this scripting across embed demo, then you are not experiencing this problem. if it doesn't, then you almost certainly are. background mozilla decides if and how it can open files by using their media (mime) type. it obtains the media type for files in various ways. for files loaded over the network via http, it requires and uses the value assigned to the content-type http header. for files loaded locally, it first looks in a cache of filename extension to media type mappings (stored in a mozilla profile file called mimetypes.rdf), and if it doesn't find a media type there, it asks the operating system. a...
...rious ways. for files loaded over the network via http, it requires and uses the value assigned to the content-type http header. for files loaded locally, it first looks in a cache of filename extension to media type mappings (stored in a mozilla profile file called mimetypes.rdf), and if it doesn't find a media type there, it asks the operating system. actually, in mozilla firefox 1.5, the media type for files embedded into html using the html <embed> and <object> tags is (unfortunately) obtained in the same way as it's obtained for local files instead of using the http headers as it should. this bug has been fixed in trunk builds. ...
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I/O Types
this chapter describes the most common nspr types, enumerations, and structures used with the functions described in i/o functions and network addresses. these include the types used for system access, normal file i/o, and socket (network) i/o. types unique to a particular function are described with the function itself. for sample code that illustrates basic i/o operations, see introduction to nspr. directory type file descriptor types file info types network address types types used with socket options functions type used with memory-mapped i/o offset interpretation for seek functions directory type prdir file descriptor types nspr represents i/o objects, such as open files and sockets, by file descriptors of type prfiledesc. this section introduces prfiledesc and related...
... prfiledesc priomethods prfileprivate prdescidentity note that the nspr documentation follows the unix convention of using the termfiles to refer to many kinds of i/o objects. to refer specifically to the files in a file system (that is, disk files), this documentation uses the termnormal files. prfiledesc has an object-oriented flavor. ...
...entation follows the unix convention of using the termfiles to refer to many kinds of i/o objects. to refer specifically to the files in a file system (that is, disk files), this documentation uses the termnormal files. prfiledesc has an object-oriented flavor. an i/o function on a prfiledesc structure is carried out by invoking the corresponding "method" in the i/o methods table (a structure of type priomethods) of the prfiledesc structure (the "object"). different kinds of i/o objects (such as files and sockets) have different i/o methods tables, thus implementing different behavior in response to the same i/o function call. nspr supports the implementation of layered i/o. each layer is represented by a prfiledesc structure, and the prfiledesc structures for the layers are chained together...
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NSPR Types
this chapter describes the most common nspr types. other chapters describe more specialized types when describing the functions that use them. calling convention types are used for externally visible functions and globals. algebraic types of various lengths are used for integer algebra. miscellaneous types are used for representing size, pointer difference, boolean values, and return values. for information on naming conventions for nspr types, functions, and macros, see nspr naming conventions. calling convention types these types are used to support cross-platform declarations of prototypes and implementations: pr_extern is used for declarations of external functions or variables. pr_implement is used for definitions of external functions or variables. pr_callback is used for ...
... pr_extern is used for declarations of external functions or variables. pr_implement is used for definitions of external functions or variables. pr_callback is used for definitions and declarations of functions that are called via function pointers. a typical example is a function implemented in an application but called from a shared library. ...
...cal example is a function implemented in an application but called from a shared library. ...
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FunctionType
functiontype represents c function. syntax returns a new ctype object describing a c function. ctype functiontype( abi, returntype[, argtype1, ...] ); parameters abi the abi type for the function; this is one of the abi constants. returntype a ctype indicating the type of the value returned by the function. argtype1... argtypen zero or more ctype objects indicating the types of each of the parameters passed into the c function. return value a ctype describing the function type. the equivalent c function type declaration would be: returntype (*) ([argtype1, ..., argtypen]); exceptions thrown typeerror abi is not a valid abi constants, or returntype or any of the argument types are not valid ctype objects. ...
...dicating the types of each of the parameters passed into the c function. return value a ctype describing the function type. the equivalent c function type declaration would be: returntype (*) ([argtype1, ..., argtypen]); exceptions thrown typeerror abi is not a valid abi constants, or returntype or any of the argument types are not valid ctype objects. properties property type description abi one of the abi constants the abi of the function. read only. argtypes ctype[] a sealed array of the argument types. read only. returntype ctype the return type of the function. read only. properties inherited from ctype these properties are available on all ctype objects. ...
...rties property type description abi one of the abi constants the abi of the function. read only. argtypes ctype[] a sealed array of the argument types. read only. returntype ctype the return type of the function. read only. properties inherited from ctype these properties are available on all ctype objects. property type description name string the type's name. read only. for primitive types, this is just the name of the corresponding c type. for structure and opaque pointer types, this is simply the string that was passed to the constructor. for other function, pointer, and array types, this should be a valid c type expression. ...
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CSS Typed Object Model API - Web APIs
this is easier for authors (for example, numeric values are reflected with actual js numbers, and have unit-aware mathematical operations defined for them). ...
...this is easier for authors (for example, numeric values are reflected with actual js numbers, and have unit-aware mathematical operations defined for them). ...
...ly and more reliably than string parsing and concatenation. this is easier for authors (for example, numeric values are reflected with actual js numbers, and have unit-aware mathematical operations defined for them). it is also generally faster, as values can be directly manipulated and then cheaply translated back into underlying values without having to both build and parse strings of css. css typed om both allows for the performant manipulation of values assigned to css properties while enabling maintainable code that is both more understand and easier to write. interfaces cssstylevalue the cssstylevalue interface of the the css typed object model api is the base class of all css values accessible through the typed om api. an instance of this class may be used anywhere a string is expec...
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DataTransfer.types - Web APIs
the datatransfer.types read-only property returns an array of the drag data formats (as strings) that were set in the dragstart event. the order of the formats is the same order as the data included in the drag operation. the formats are unicode strings giving the type or format of the data, generally given by a mime type. some values that are not mime types are special-cased for legacy reasons (for example "text"). syntax datatransfer.types; return value an array of the data formats used in the drag operation. each format is string. if the drag operation included no data, this list will be empty. if any files are included in the drag operation, then one of the types will be the string files. example this example shows the use of the types and items properties. ...
...cy reasons (for example "text"). syntax datatransfer.types; return value an array of the data formats used in the drag operation. each format is string. if the drag operation included no data, this list will be empty. if any files are included in the drag operation, then one of the types will be the string files. example this example shows the use of the types and items properties. ...
...es; return value an array of the data formats used in the drag operation. each format is string. if the drag operation included no data, this list will be empty. if any files are included in the drag operation, then one of the types will be the string files. example this example shows the use of the types and items properties. ...
...And 6 more matches

Event.type - Web APIs
the type read-only property of the event interface returns a string containing the event's type. it is set when the event is constructed and is the name commonly used to refer to the specific event, such as click, load, or error. for a list of available event types, see the event reference. syntax let eventtype = event.type; value a domstring containing the type of event. example this example logs the event type whenever you press a keyboard key or click a mouse button. ...
... the name commonly used to refer to the specific event, such as click, load, or error. for a list of available event types, see the event reference. syntax let eventtype = event.type; value a domstring containing the type of event. example this example logs the event type whenever you press a keyboard key or click a mouse button. ...
...uch as click, load, or error. for a list of available event types, see the event reference. syntax let eventtype = event.type; value a domstring containing the type of event. example this example logs the event type whenever you press a keyboard key or click a mouse button. ...
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MediaRecorder.mimeType - Web APIs
the mimetype read-only property returns the mime media type that was specified when creating the mediarecorder object, or, if none was specified, which was chosen by the browser. this is the file format of the file that would result from writing all of the recorded data to disk. keep in mind that not all codecs are supported by a given container; if you write media using a codec that is not supported by a given media container, the resulting file may not work reliably if at all when you try to play it back. see our media type and format guide for information about container and codec support across browsers. note: the term "mime type" is officially considered to be historical; these strings are now officially known as media types. mdn web docs content uses the terms interchangeably. synt...
... media container, the resulting file may not work reliably if at all when you try to play it back. see our media type and format guide for information about container and codec support across browsers. note: the term "mime type" is officially considered to be historical; these strings are now officially known as media types. mdn web docs content uses the terms interchangeably. syntax var mimetype = mediarecorder.mimetype value the mime media type which describes the format of the recorded media, as a domstring. this string may include the codecs parameter, giving details about the codecs and the codec configurations used by the media recorder. ...
... example ... ...
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scroll-snap-type - CSS: Cascading Style Sheets
the scroll-snap-type css property sets how strictly snap points are enforced on the scroll container in case there is one. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. specifying any precise animations or physics used to enforce those snap points is not covered by this property but instead left up to the user agent. ...
...e for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. specifying any precise animations or physics used to enforce those snap points is not covered by this property but instead left up to the user agent. ...
...xample is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. specifying any precise animations or physics used to enforce those snap points is not covered by this property but instead left up to the user agent. ...
...And 6 more matches

<input type="reset"> - HTML: Hypertext Markup Language
<input> elements of type "reset" are rendered as buttons, with a default click event handler that resets all of the inputs in the form to their initial values. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. you should usually avoid including reset buttons in your forms. they're rarely useful, and are instead more likely to frustrate users who click them by mistake (often while trying to click the submit button). ...
.../github.com/mdn/interactive-examples and send us a pull request. you should usually avoid including reset buttons in your forms. they're rarely useful, and are instead more likely to frustrate users who click them by mistake (often while trying to click the submit button). ...
...ding reset buttons in your forms. they're rarely useful, and are instead more likely to frustrate users who click them by mistake (often while trying to click the submit button). value a domstring used as the button's label events click supported common attributes type and value idl attributes value methods none value an <input type="reset"> element's value attribute contains a domstring that is used as the button's label. ...
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X-Content-Type-Options - HTTP
the x-content-type-options response http header is a marker used by the server to indicate that the mime types advertised in the content-type headers should not be changed and be followed. this is a way to opt out of mime type sniffing, or, in other words, to say that the mime types are deliberately configured. this header was introduced by microsoft in ie 8 as a way for webmasters to block content sniffing that was happening and could transform non-executable mime types into executable mime types. since then, other browsers have introduced it, even if their mime sniffing algorithms were less aggressive. starting with firefox 72, the opting out of mime sniffing is also applied to top-level documents if a content-type is provided. this can cause html web pages to be downloaded instead of bei...
...rm non-executable mime types into executable mime types. since then, other browsers have introduced it, even if their mime sniffing algorithms were less aggressive. starting with firefox 72, the opting out of mime sniffing is also applied to top-level documents if a content-type is provided. this can cause html web pages to be downloaded instead of being rendered when they are served with a mime type other than text/html. make sure to set both headers correctly. site security testers usually expect this header to be set. note: x-content-type-options only apply request-blocking due to nosniff for request destinations of "script" and "style". however, it also enables cross-origin read blocking (corb) protection for html, txt, json and xml files (excluding svg image/svg+xml). header ...
... other than text/html. make sure to set both headers correctly. site security testers usually expect this header to be set. note: x-content-type-options only apply request-blocking due to nosniff for request destinations of "script" and "style". however, it also enables cross-origin read blocking (corb) protection for html, txt, json and xml files (excluding svg image/svg+xml). ...
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TypeError: property "x" is non-configurable and can't be deleted - JavaScript
what went wrong? it was attempted to delete a property, but that property is non-configurable. ...
... what went wrong? it was attempted to delete a property, but that property is non-configurable. ...
... what went wrong? it was attempted to delete a property, but that property is non-configurable. ...
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Function.prototype.apply() - JavaScript
ndefined or null a similar outcome can be achieved using the array spread syntax. you can assign a different this object when calling an existing function. this refers to the current object (the calling object). with apply, you can write a method once, and then inherit it in another object, without having to rewrite the method for the new object. apply is very similar to call(), except for the type of arguments it supports. you use an arguments array instead of a list of arguments (parameters). with apply, you can also use an array literal, for example, func.apply(this, ['eat', 'bananas']), or an array object, for example, func.apply(this, new array('eat', 'bananas')). you can also use arguments for the argsarray parameter. arguments is a local variable of a function. it can be used for al...
... min = math.min(submin, min); } return min; } let min = minofarray([5, 6, 2, 3, 7]); using apply to chain constructors you can use apply to chain constructors for an object (similar to java). in the following example we will create a global function method called construct, which will enable you to use an array-like object with a constructor instead of an arguments list. ...
...y([5, 6, 2, 3, 7]); using apply to chain constructors you can use apply to chain constructors for an object (similar to java). in the following example we will create a global function method called construct, which will enable you to use an array-like object with a constructor instead of an arguments list. ...
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Object.prototype.__noSuchMethod__ - Archive of obsolete content
object, with which you can achieve the below (and more). syntax obj.__nosuchmethod__ = fun parameters fun a function that takes the form function (id, args) { . . . ...
...exist on an object results in a typeerror being thrown. this behavior can be circumvented by defining a function at that object's __nosuchmethod__ member. the function takes two arguments, the first is the name of the method attempted and the second is an array of the arguments that were passed in the method call. the second argument is an actual array (that is, it inherits through the array.prototype chain) and not the array-like arguments object. if this method cannot be called, either as if undefined by default, if deleted, or if manually set to a non-function, the javascript engine will revert to throwing typeerrors. examples simple test of __nosuchmethod__ var o = { __nosuchmethod__: function(id, args) { console.log(id, '(' + args.join(', ') + ')'); ...
...hmethod__ to simulate multiple inheritance an example of code that implements a primitive form of multiple inheritance is shown below. ...
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Effective connection type - MDN Web Docs Glossary: Definitions of Web-related terms
2g 1400ms 70 kbps the network is suited for transfers of small images. ...
... 2g 1400ms 70 kbps the network is suited for transfers of small images. ...
... 2g 1400ms 70 kbps the network is suited for transfers of small images. ...
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CSSPseudoElement.type - Web APIs
the type read-only property of the csspseudoelement interface returns the type of the pseudo-element as a string, represented in the form of a css selector. ...
... the type read-only property of the csspseudoelement interface returns the type of the pseudo-element as a string, represented in the form of a css selector. ...
... the type read-only property of the csspseudoelement interface returns the type of the pseudo-element as a string, represented in the form of a css selector. ...
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DocumentType - Web APIs
the documenttype interface represents a node containing a doctype. <div id="interfacediagram" style="display: inline-block; position: relative; width: 100%; padding-bottom: 11.666666666666666%; vertical-align: middle; overflow: hidden;"><svg style="display: inline-block; position: absolute; top: 0; left: 0;" viewbox="-50 0 600 70" preserveaspectratio="xminymin meet"><a xlink:href="/docs/web/api/eventtarget" target="_top"><rect x="1" y="1" width="110" height="50" fill="#fff" stroke="#d4dde4" stroke-width="2px" /><text x="56" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">eventtarget</text></a><polyline points="111,25 121,20 121,30 111,25" stroke="#d4dde4" fill="none"/><line x1="121" y1="25" x2...
...0" fill="#fff" stroke="#d4dde4" stroke-width="2px" /><text x="188.5" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">node</text></a><polyline points="226,25 236,20 236,30 226,25" stroke="#d4dde4" fill="none"/><line x1="236" y1="25" x2="266" y2="25" stroke="#d4dde4"/><a xlink:href="/docs/web/api/documenttype" target="_top"><rect x="266" y="1" width="120" height="50" fill="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="326" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">documenttype</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties inherits properties fr...
...8" stroke="#d4dde4" stroke-width="2px" /><text x="326" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">documenttype</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties inherits properties from its parent, node, and implements the childnode interface. documenttype.entities read only a namednodemap of entities declared in the dtd. every node in this map implements the entity interface. ...
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PerformanceNavigationTiming.type - Web APIs
example the following example illustrates this property's usage. ...
... example the following example illustrates this property's usage. ...
...r's address bar, form submission, or initializing through a script operation other than reload and back_forward as listed below. reload navigation is through the browser's reload operation or location.reload(). back_forward navigation is through the browser's history traversal operation. prerender navigation is initiated by a prerender hint. this property is read only . ...
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<input type="hidden"> - HTML: Hypertext Markup Language
events none. ...
...is submitted. for example, the id of the content that is currently being ordered or edited, or a unique security token. hidden inputs are completely invisible in the rendered page, and there is no way to make it visible in the page's content. note: there is a live example below the following line of code — if it is working correctly, you should see nothing! <input id="prodid" name="prodid" type="hidden" value="xm234jq"> value a domstring representing the value of the hidden data you want to pass back to the server. events none. supported common attributes autocomplete idl attributes value methods none. note: the input and change events do not apply to this input type. hidden inputs cannot be focused even using javas...
...ayed to the user in the page's content, it is visible—and can be edited—using any browser's developer tools or "view source" functionality. do not rely on hidden inputs as a form of security. additional attributes in addition to the attributes common to all <input> elements, hidden inputs offer the following attributes: attribute description name like all input types, the name of the input to report when submitting the form; the special value _charset_ causes the hidden input's value to be reported as the character encoding used to submit the form name this is actually one of the common attributes, but it has a special meaning available for hidden inputs. normally, the name attribute functions on hidden inputs just like on any other input. however, w...
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TypeError: setting getter-only property "x" - JavaScript
there is an attempt to set a new value to a property for which only a getter is specified. ...
... there is an attempt to set a new value to a property for which only a getter is specified. ...
... there is an attempt to set a new value to a property for which only a getter is specified. ...
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TypeError: invalid assignment to const "x" - JavaScript
a constant is a value that cannot be altered by the program during normal execution. it cannot change through re-assignment, and it can't be redeclared. ...
... a constant is a value that cannot be altered by the program during normal execution. it cannot change through re-assignment, and it can't be redeclared. ...
... a constant is a value that cannot be altered by the program during normal execution. it cannot change through re-assignment, and it can't be redeclared. ...
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TypeError: "x" is not a non-null object - JavaScript
null is not an object and won't work. you must provide a proper object in the given situation. ...
...null is not an object and won't work. you must provide a proper object in the given situation. ...
...null is not an object and won't work. you must provide a proper object in the given situation. ...
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Array.prototype.filter() - JavaScript
re, it may not be present in all implementations of the standard. you can work around this by inserting the following code at the beginning of your scripts, allowing use of filter() in ecma-262 implementations which do not natively support it. ...
...implementations of the standard. you can work around this by inserting the following code at the beginning of your scripts, allowing use of filter() in ecma-262 implementations which do not natively support it. this algorithm is exactly equivalent to the one specified in ecma-262, 5th edition, assuming that fn.call evaluates to the original value of function.prototype.bind(), and that array.prototype.push() has its original value. ...
... this by inserting the following code at the beginning of your scripts, allowing use of filter() in ecma-262 implementations which do not natively support it. this algorithm is exactly equivalent to the one specified in ecma-262, 5th edition, assuming that fn.call evaluates to the original value of function.prototype.bind(), and that array.prototype.push() has its original value. ...
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Array.prototype.find() - JavaScript
isfies the provided testing function. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. if you need the index of the found element in the array, use findindex(). if you need to find the index of a value, use array.prototype.indexof(). (it’s similar to findindex(), but checks each element for equality with the value instead of using a testing function.) if you need to find if a value exists in an array, use array.prototype.includes(). again, it checks each element for equality with the value instead of using a testing function. if you need to find if any element satisfies the provided testing function, use array.
...xof(). (it’s similar to findindex(), but checks each element for equality with the value instead of using a testing function.) if you need to find if a value exists in an array, use array.prototype.includes(). again, it checks each element for equality with the value instead of using a testing function. if you need to find if any element satisfies the provided testing function, use array.prototype.some(). syntax arr.find(callback(element[, index[, array]])[, thisarg]) parameters callback function to execute on each value in the array, taking 3 arguments: element the current element in the array. index optional the index (position) of the current element in the array. array optional the array that find was called on. thisarg optional object to use as this inside ...
...ns. if an existing, yet-unvisited element of the array is changed by callback, its value passed to the callback will be the value at the time find visits that element's index. elements that are deleted are still visited. polyfill this method has been added to the ecmascript 2015 specification and may not be available in all javascript implementations yet. however, you can polyfill array.prototype.find with the following snippet: // https://tc39.github.io/ecma262/#sec-array.prototype.find if (!array.prototype.find) { object.defineproperty(array.prototype, 'find', { value: function(predicate) { // 1. let o be ? toobject(this value). if (this == null) { throw typeerror('"this" is null or not defined'); } var o = object(this); // 2. let len be ? ...
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Array.prototype.indexOf() - JavaScript
ront to back. if the provided index is 0, then the whole array will be searched. default: 0 (entire array is searched). return value the first index of the element in the array; -1 if not found. description indexof() compares searchelement to elements of the array using strict equality (the same method used by the === or triple-equals operator). ...
...see string.prototype.indexof(). polyfill indexof() was added to the ecma-262 standard in the 5th edition; as such it may not be present in all browsers. you can work around this by utilizing the following code at the beginning of your scripts. this will allow you to use indexof() when there is still no native support. this algorithm matches the one specified in ecma-262, 5th edition, assuming typeerror and math.abs() have their original values. // this version tries to optimize by only checking for "in" when looking for undefined and // skipping the definitely fruitless nan search. other parts are merely cosmetic conciseness. // whether it is actually faster remains to be seen. ...
...native support. this algorithm matches the one specified in ecma-262, 5th edition, assuming typeerror and math.abs() have their original values. // this version tries to optimize by only checking for "in" when looking for undefined and // skipping the definitely fruitless nan search. other parts are merely cosmetic conciseness. // whether it is actually faster remains to be seen. ...
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Array.prototype.some() - JavaScript
! polyfill some() was added to the ecma-262 standard in the 5th edition, and it may not be present in all implementations of the standard. you can work around this by inserting the following code at the beginning of your scripts, allowing use of some() in implementations which do not natively support it. ...
... all implementations of the standard. you can work around this by inserting the following code at the beginning of your scripts, allowing use of some() in implementations which do not natively support it. this algorithm is exactly the one specified in ecma-262, 5th edition, assuming object and typeerror have their original values and that fun.call evaluates to the original value of function.prototype.call(). ...
...lowing use of some() in implementations which do not natively support it. this algorithm is exactly the one specified in ecma-262, 5th edition, assuming object and typeerror have their original values and that fun.call evaluates to the original value of function.prototype.call(). ...
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Function.prototype.toString() - JavaScript
stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax function.tostring() return value a string representing the source code of the function. ...
...from object; it does not inherit object.prototype.tostring. for user-defined function objects, the tostring method returns a string containing the source text segment which was used to define the function. javascript calls the tostring method automatically when a function is to be represented as a text value, e.g. when a function is concatenated with a string. the tostring() method will throw a typeerror exception ("function.prototype.tostring called on incompatible object"), if its this value object is not a function object. ...
...urce text segment which was used to define the function. javascript calls the tostring method automatically when a function is to be represented as a text value, e.g. when a function is concatenated with a string. the tostring() method will throw a typeerror exception ("function.prototype.tostring called on incompatible object"), if its this value object is not a function object. ...
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Object.prototype.toLocaleString() - JavaScript
com/mdn/interactive-examples and send us a pull request. syntax obj.tolocalestring() return value a string representing the object. description object's tolocalestring returns the result of calling tostring(). this function is provided to give objects a generic tolocalestring method, even though not all may use it. see the list below. ...
...pull request. syntax obj.tolocalestring() return value a string representing the object. description object's tolocalestring returns the result of calling tostring(). this function is provided to give objects a generic tolocalestring method, even though not all may use it. see the list below. ...
...ng() return value a string representing the object. description object's tolocalestring returns the result of calling tostring(). this function is provided to give objects a generic tolocalestring method, even though not all may use it. see the list below. ...
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Promise.prototype.catch() - JavaScript
this means that you have to provide an onrejected function even if you want to fall back to an undefined result value - for example obj.catch(() => {}). the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. ...
...nrejected); p.catch(function(reason) { // rejection }); parameters onrejected a function called when the promise is rejected. this function has one argument: reason the rejection reason. the promise returned by catch() is rejected if onrejected throws an error or returns a promise which is itself rejected; otherwise, it is resolved. return value internally calls promise.prototype.then on the object upon which it was called, passing the parameters undefined and the received onrejected handler. returns the value of that call, which is a promise. note the examples below are throwing instances of error. this is considered good practice in contrast to throwing strings; otherwise, the part doing the catching would have to perform checks to see if the argument was a string or ...
...ll, which is a promise. note the examples below are throwing instances of error. this is considered good practice in contrast to throwing strings; otherwise, the part doing the catching would have to perform checks to see if the argument was a string or an error, and you might lose valuable information like stack traces. ...
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handler.getPrototypeOf() - JavaScript
the handler.getprototypeof() method is a trap for the [[getprototypeof]] internal method. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax const p = new proxy(obj, { getprototypeof(target) { ... } }); parameters the following parameter is passed to the getprototypeof() method. this is bound to the handler. target the target object. return value the getprototypeof() method must return an object or null. ...
...us a pull request. syntax const p = new proxy(obj, { getprototypeof(target) { ... } }); parameters the following parameter is passed to the getprototypeof() method. this is bound to the handler. target the target object. return value the getprototypeof() method must return an object or null. description interceptions this trap can intercept these operations: object.getprototypeof() reflect.getprototypeof() __proto__ object.prototype.isprototypeof() instanceof invariants if the following invariants are violated, the proxy will throw a typeerror: getprototypeof() method must return an object or null. if target is not extensible, object.getprototypeof(proxy) method must return the same value as object.getprototypeof(target). examples basic usage const obj = ...
...ototype.isprototypeof() instanceof invariants if the following invariants are violated, the proxy will throw a typeerror: getprototypeof() method must return an object or null. if target is not extensible, object.getprototypeof(proxy) method must return the same value as object.getprototypeof(target). ...
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TypeError - JavaScript
the typeerror object represents an error when an operation could not be performed, typically (but not exclusively) when a value is not of the expected type. a typeerror may be thrown when: an operand or argument passed to a function is incompatible with the type expected by that operator or function; or when attempting to modify a value that cannot be changed; or when attempting to use a value in an inappropriate way. constructor typeerror() creates a new typeerror object. instance properties typeerror.prototype.message error message. although ecma-262 specifies that typeerror should provide its own message property, in spidermonkey, it inherits error.prototype.message. typeerror.prototype.name error name. inherited from error. ...
...changed; or when attempting to use a value in an inappropriate way. constructor typeerror() creates a new typeerror object. instance properties typeerror.prototype.message error message. although ecma-262 specifies that typeerror should provide its own message property, in spidermonkey, it inherits error.prototype.message. typeerror.prototype.name error name. inherited from error. typeerror.prototype.filename path to file that raised this error. inherited from error. typeerror.prototype.linenumber line number in file that raised this error. inherited from error. typeerror.prototype.columnnumber column number in line that raised this error. inherited from error. ...
...rmonkey, it inherits error.prototype.message. typeerror.prototype.name error name. inherited from error. typeerror.prototype.filename path to file that raised this error. inherited from error. typeerror.prototype.linenumber line number in file that raised this error. inherited from error. typeerror.prototype.columnnumber column number in line that raised this error. inherited from error. typeerror.prototype.stack stack trace. inherited from error. ...
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Content type - SVG: Scalable Vector Graphics
angle <angle> angles are specified in one of two ways. when used in the value of a property in a stylesheet, an <angle> is defined as follows: angle ::= number (~"deg" | ~"grad" | ~"rad")? where deg indicates degrees, grad indicates grads and rad indicates radians. for properties defined in css2, an angle unit identifier must be provided. for angle values in svg-specific properties and their corresponding presentation attributes, the angle unit identifier is optional. if not provided, the angle value is assumed to be in degrees. ...
...r in css2, the angle identifier, if specified, must be in lower case. when angles are used in an svg attribute, <angle> is instead defined as follows: angle ::= number ("deg" | "grad" | "rad")? the unit identifiers in such <angle> values must be in lower case. in the svg dom, <angle> values are represented using svgangle or svganimatedangle objects. anything <anything> the basic type <anything> is a sequence of zero or more characters. specifically: anything ::= char* where char is the production for a character, as defined in xml 1.0 , section 2.2. clock-value <clock-value> clock values have the same syntax as in smil animation specification. the grammar for clock values is repeated here: clock-val ::= full-clock-val | partial-clock-val ...
... = 10.5 seconds = 10 seconds and 500 milliseconds timecount values: 3.2h = 3.2 hours = 3 hours and 12 minutes 45min = 45 minutes 30s = 30 seconds 5ms = 5 milliseconds 12.467 = 12 seconds and 467 milliseconds fractional values are just (base 10) floating point definitions of seconds. thus: 00.5s = 500 milliseconds 00:00.005 = 5 milliseconds color <color> the basic type <color> is a css2 compatible specification for a color in the srgb color space. <color> applies to svg's use of the color attribute and is a component of the definitions of attributes fill, stroke, stop-color, flood-color, and lighting-color, which also offer optional icc-based color specifications. svg supports all of the syntax alternatives for <color> defined in css2 syntax and basic data ty...
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textbox.type - Archive of obsolete content
« xul reference home type type: one of the values below you can set the type attribute to one of the values below for a more specialized type of textbox. don't set the type if you wish to use a regular textbox. autocomplete a textbox that supports autocomplete. for more information about autocomplete textboxes, see the autocomplete documentation (xpfe [thunderbird/seamonkey]) (firefox) number a textbox that only allows the user to enter numbers. in addition, arrow buttons appear next to the textbox to let the user step through values. there are several attributes that allow the number textbox to be configured, including decimalplaces, min, max, increment, wraparound, hidespinbuttons, and textbox.value. ...
...derbird/seamonkey]) (firefox) number a textbox that only allows the user to enter numbers. in addition, arrow buttons appear next to the textbox to let the user step through values. there are several attributes that allow the number textbox to be configured, including decimalplaces, min, max, increment, wraparound, hidespinbuttons, and textbox.value. password a textbox that hides what is typed, used for entering passwords. search a textbox intended for searching. the command event will fire as the user modifies the value. a listener for the command event should update search results. if the searchbutton attribute is set to true, the command event is only fired if the user presses the search button or presses the enter key. you may specify grey text to appear when the search box i...
.... if the searchbutton attribute is set to true, the command event is only fired if the user presses the search button or presses the enter key. you may specify grey text to appear when the search box is empty using the emptytext attribute, and a timeout may be set for the command event using the timeout attribute (defaults to 500). ...
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Mozilla's DOCTYPE sniffing - Archive of obsolete content
irefox 4 / thunderbird 3.3 / seamonkey 2.1) this feature is obsolete. although it may still work in some browsers, its use is discouraged since it could be removed at any time. try to avoid using it. this page describes behavior of the old html parser in firefox 3.6 and older. it has been replaced by a new html 5 parser in firefox 4 and newer. this document describes how mozilla uses the doctype declaration to determine strict mode vs. quirks mode. the code that makes this determination is currently in determineparsemode() in nsparser.cpp. see bug 1312 and bug 55264 for some of the history of the mode determination. see bug 153032 for the creation of the almost-standards mode around mozilla 1.0. the goals that led to choosing this behavior were the following: almost all existing text/...
...choosing this behavior were the following: almost all existing text/html pages on the web that need to be in quirks mode to be displayed correctly should be displayed using quirks mode. (almost all, rather than all, to allow for the following points as well.) authors writing web pages to current standards should be able to trigger strict mode. ...
...itten using any public identifiers in doctype declarations that appear in the future should be displayed using strict mode. in other words, the algorithm is the best approximation we can find for determining which pages were written after mozilla became a known important user-agent on the web. full standards mode the following trigger full standards mode: any document sent with an xml mime type such as text/xml, application/xml, or application/xhtml+xml (since sniffing only occurs for documents sent as text/html). any "doctype html system" as opposed to "doctype html public", except for the ibm doctype noted below a doctype declaration without a dtd, i.e., <!doctype html>. a doctype declaration with an internal subset. ...
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js-ctypes
js-ctypes allows application and extension code to call back and forth to native code written in c. c++ support is possible through vtable pointers see using com from js-ctypes. for a discussion on extended c++ support see bug 505907. other work made possible by js-ctypes is jni, this is elaborated on in the jni.jsm section and not the js-ctypes section due to the jsm abstracting away all of the js-ctypes. unlike binary xpcom components, it allows developers to ship a single binary for use with multiple versions of firefox. note: js-ctypes is only available from chrome code; that is, ctypes is not available to websites, only application and extension code. ...
...d not the js-ctypes section due to the jsm abstracting away all of the js-ctypes. unlike binary xpcom components, it allows developers to ship a single binary for use with multiple versions of firefox. note: js-ctypes is only available from chrome code; that is, ctypes is not available to websites, only application and extension code. documentation if you are brand new to js-ctypes, and have no idea about it, the pages you should read first is - ctypes.open followed by standard os libraries. ...
...hip a single binary for use with multiple versions of firefox. note: js-ctypes is only available from chrome code; that is, ctypes is not available to websites, only application and extension code. documentation if you are brand new to js-ctypes, and have no idea about it, the pages you should read first is - ctypes.open followed by standard os libraries. ...
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BiquadFilterNode.type - Web APIs
frequencies below the cutoff pass through; frequencies above it are attenuated. the cutoff frequency. indicates how peaked the frequency is around the cutoff. the greater the value is, the greater is the peak. ...
...frequencies below the cutoff pass through; frequencies above it are attenuated. the cutoff frequency. indicates how peaked the frequency is around the cutoff. the greater the value is, the greater is the peak. ...
...frequencies below the cutoff pass through; frequencies above it are attenuated. the cutoff frequency. indicates how peaked the frequency is around the cutoff. the greater the value is, the greater is the peak. ...
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Client.type - Web APIs
the value can be one of "window" "worker" "sharedworker" example // service worker client (e.g. ...
...the value can be one of "window" "worker" "sharedworker" example // service worker client (e.g. ...
...the value can be one of "window" "worker" "sharedworker" example // service worker client (e.g. ...
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XMLHttpRequestResponseType - Web APIs
see html in xmlhttprequest to learn more about using xhr to fetch html content. ...
...see html in xmlhttprequest to learn more about using xhr to fetch html content. ...
...see html in xmlhttprequest to learn more about using xhr to fetch html content. ...
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<input type="color"> - HTML: Hypertext Markup Language
only simple colors (without alpha channel) are allowed though css colors has more formats, e.g. color names, functional notations and a hexadecimal format with an alpha channel. the element's presentation may vary substantially from one browser and/or platform to another—it might be a simple textual input that automatically validates to ensure that the color information is entered in the proper format, or a platform-standard color picker, or some kind of custom color picker window. ...
...ease clone https://github.com/mdn/interactive-examples and send us a pull request. value a 7-character domstring specifying a <color> in lower-case hexadecimal notation events change and input supported common attributes autocomplete and list idl attributes list and value methods select() value the value of an <input> element of type color is always a domstring which contains a 7-character string specifying an rgb color in hexadecimal format. while you can input the color in either upper- or lower-case, it will be stored in lower-case form. the value is never in any other form, and is never empty. note: setting the value to anything that isn't a valid, fully-opaque, rgb color in hexadecimal notation will result in the value...
...lor names, or any css function syntax, to set the value. this makes sense when you keep in mind that html and css are separate languages and specifications. in addition, colors with an alpha channel are not supported; specifying a color in 9-character hexadecimal notation (e.g. #009900aa) will also result in the color being set to #000000. note: any web browser that doesn't support an input of type color will naturally fall back to the type text. because users can write colors in many different ways (such as rgb(255, 255, 0)), one way to work around this is to set a pattern attribute equal to either #[0-9a-f]{6} or #[0-9a-fa-f]{6} (preferably the latter because some users may not expect a different result with just a letter-case change) and set a placeholder attribute equal to a color repre...
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TypeError: cyclic object value - JavaScript
the json format per se doesn't support object references (although an ietf draft exists), hence json.stringify() doesn't try to solve them and fails accordingly. ...
... the json format per se doesn't support object references (although an ietf draft exists), hence json.stringify() doesn't try to solve them and fails accordingly. ...
... the json format per se doesn't support object references (although an ietf draft exists), hence json.stringify() doesn't try to solve them and fails accordingly. ...
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Array.prototype.map() - JavaScript
ank. polyfill map was added to the ecma-262 standard in the 5th edition. therefore, it may not be present in all implementations of the standard. you can work around this by inserting the following code at the beginning of your scripts, allowing use of map in implementations which do not natively support it. ...
...mentations of the standard. you can work around this by inserting the following code at the beginning of your scripts, allowing use of map in implementations which do not natively support it. this algorithm is exactly the one specified in ecma-262, 5th edition, assuming object, typeerror, and array have their original values and that callback.call evaluates to the original value of function.prototype.call. // production steps of ecma-262, edition 5, 15.4.4.19 // reference: http://es5.github.io/#x15.4.4.19 if (!array.prototype.map) { array.prototype.map = function(callback/*, thisarg*/) { var t, a, k; if (this == null) { throw new typeerror('this is null or not defined'); } // 1. let o be the result of calling toobject passing the |this| // value as the argu...
...s null or not defined'); } // 1. let o be the result of calling toobject passing the |this| // value as the argument. var o = object(this); // 2. let lenvalue be the result of calling the get internal // method of o with the argument "length". // 3. let len be touint32(lenvalue). var len = o.length >>> 0; // 4. if iscallable(callback) is false, throw a typeerror exception. // see: http://es5.github.com/#x9.11 if (typeof callback !== 'function') { throw new typeerror(callback + ' is not a function'); } // 5. if thisarg was supplied, let t be thisarg; else let t be undefined. if (arguments.length > 1) { t = arguments[1]; } // 6. let a be a new array created as if by the expression new array(len) // wher...
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Array.prototype.toLocaleString() - JavaScript
rings are separated by a locale-specific string (such as a comma “,”). syntax arr.tolocalestring([locales[, options]]); parameters locales optional a string with a bcp 47 language tag, or an array of such strings. for the general form and interpretation of the locales argument, see the intl page. options optional an object with configuration properties, for numbers see number.prototype.tolocalestring(), and for dates see date.prototype.tolocalestring(). return value a string representing the elements of the array. polyfill // https://tc39.github.io/ecma402/#sup-array.prototype.tolocalestring if (!array.prototype.tolocalestring) { object.defineproperty(array.prototype, 'tolocalestring', { value: function(locales, options) { // 1. let o be ? toobject(this value)...
...let len be ? tolength(? get(a, "length")). var len = a.length >>> 0; // 3. let separator be the string value for the // list-separator string appropriate for the // host environment's current locale (this is // derived in an implementation-defined way). ...
... : nextelement.tolocalestring(locales, options); // e. let r be a string value produced by // concatenating s and r. r = s + r; // f. increase k by 1. k++; } // 10. return r. ...
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handler.setPrototypeOf() - JavaScript
the handler.setprototypeof() method is a trap for object.setprototypeof(). the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax const p = new proxy(target, { setprototypeof: function(target, prototype) { } }); parameters the following parameters are passed to the setprototypeof() method. this is bound to the handler. target the target object. prototype the object's new prototype or null. return value the setprototypeof() method returns true if the [[prototype]] was successfully changed, otherwise false. description the handler.setprototypeof() method is a trap for object.setprototypeof(). inter...
...thod. this is bound to the handler. target the target object. prototype the object's new prototype or null. return value the setprototypeof() method returns true if the [[prototype]] was successfully changed, otherwise false. description the handler.setprototypeof() method is a trap for object.setprototypeof(). interceptions this trap can intercept these operations: object.setprototypeof() reflect.setprototypeof() invariants if the following invariants are violated, the proxy will throw a typeerror: if target is not extensible, the prototype parameter must be the same value as object.getprototypeof(target). ...
...p for object.setprototypeof(). interceptions this trap can intercept these operations: object.setprototypeof() reflect.setprototypeof() invariants if the following invariants are violated, the proxy will throw a typeerror: if target is not extensible, the prototype parameter must be the same value as object.getprototypeof(target). examples if you want to disallow setting a new prototype for your object, your handler's setprototypeof() method can either return false, or it can throw an exception. approach 1: returning false this approach means that any mutating operation that throws an exception on failure to mutate, must create the exception itself. for example, object.setprototypeof() will create and throw a typeerror itself. if the mutation is performed by an operation tha...
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TypeListener
typelisteners can be registered with addtypelistener() and will then receive notification as addontype are registered and unregistered. method overview void ontypeadded(in addontype type) void ontyperemoved(in addontype type) methods ontypeadded() called when an add-on type has been added. void ontypeadded( in addontype type ) parameters type the addontype that is being added needsrestart true if an application restart is necessary for the change to take effect ontyperemoved() called when an add-on type has been removed. ...
...ed(in addontype type) void ontyperemoved(in addontype type) methods ontypeadded() called when an add-on type has been added. void ontypeadded( in addontype type ) parameters type the addontype that is being added needsrestart true if an application restart is necessary for the change to take effect ontyperemoved() called when an add-on type has been removed. ...
... void ontyperemoved(in addontype type) methods ontypeadded() called when an add-on type has been added. void ontypeadded( in addontype type ) parameters type the addontype that is being added needsrestart true if an application restart is necessary for the change to take effect ontyperemoved() called when an add-on type has been removed. ...
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JS_LinkConstructorAndPrototype
this article covers features introduced in spidermonkey 17 set up ctor.prototype = proto and proto.constructor = ctor with the right property flags. syntax bool js_linkconstructorandprototype(jscontext *cx, js::handle<jsobject*> ctor, js::handle<jsobject*> proto); name type description cx jscontext * pointer to a js context from which to derive runtime information. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. ctor js::handle&lt;jsobject*&gt; pointer to the constructor object. proto js::handle&lt;jsobject*&gt; pointer to the prototype object. ...
... cx jscontext * pointer to a js context from which to derive runtime information. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. ctor js::handle&lt;jsobject*&gt; pointer to the constructor object. proto js::handle&lt;jsobject*&gt; pointer to the prototype object. ...
...ext * pointer to a js context from which to derive runtime information. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. ctor js::handle&lt;jsobject*&gt; pointer to the constructor object. proto js::handle&lt;jsobject*&gt; pointer to the prototype object. ...
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JS_SetPrototype
set a javascript object's prototype. syntax bool js_setprototype(jscontext *cx, js::handleobject obj, js::handleobject proto); name type description cx jscontext * the context in which to set the object's prototype. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. obj js::handleobject the object to modify. proto js::handleobject the object to set as the new prototype of obj. description js_setprototype sets the prototype object for a specified object. a prototype object provides properties that are shared by similar js object instances. ...
...e build, the caller must be in a request on this jscontext. obj js::handleobject the object to modify. proto js::handleobject the object to set as the new prototype of obj. description js_setprototype sets the prototype object for a specified object. a prototype object provides properties that are shared by similar js object instances. ordinarily you set a prototype for an object when you create the object with js_newobject, but if you do not set a prototype at that time, you can later call js_setprototype to do so. obj is a pointer to an existing js object, and proto is a pointer to second existing object upon which the first object is to be based. on success, js_setprototype returns true. otherwise it returns false. take care not to create a circularly-lin...
...en you create the object with js_newobject, but if you do not set a prototype at that time, you can later call js_setprototype to do so. obj is a pointer to an existing js object, and proto is a pointer to second existing object upon which the first object is to be based. on success, js_setprototype returns true. otherwise it returns false. take care not to create a circularly-linked list of prototypes using this function, because such a set of prototypes cannot be resolved by the javascript engine and can easily lead to an infinite loop. ...
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CSSNumericValue.type - Web APIs
working draft initial definition. ...
... working draft initial definition. ...
... working draft initial definition. ...
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HTMLObjectElement.type - Web APIs
living standard initial definition. ...
... living standard initial definition. ...
... living standard initial definition. ...
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NonDocumentTypeChildNode.previousElementSibling - Web APIs
the nondocumenttypechildnode.previouselementsibling read-only property returns the element immediately prior to the specified one in its parent's children list, or null if the specified element is the first one in the list. syntax prevnode = elementnodereference.previouselementsibling; example <div id="div-01">here is div-01</div> <div id="div-02">here is div-02</div> <li>this is a list item</li> <li>this is another list item</li> <div id="div-03">here is div-03</div> <script> let el = document.getelementbyid('div-03').previouselementsibling; document.write('<p>siblings of div-03</p><ol>'); while (el) { document.write('<li>' + el.nodename + '</li>'); el = el.previouselementsibling; } document.write('</ol>'); </script> this example outputs the following into the page ...
...iblings of div-03 1. li 2. li 3. div 4. ...
... unsupported prior to ie9, so the following snippet can be used to add support to ie8: // source: https://github.com/alhadis/snippets/blob/master/js/polyfills/ie8-child-elements.js if(!("previouselementsibling" in document.documentelement)){ object.defineproperty(element.prototype, "previouselementsibling", { get: function(){ var e = this.previoussibling; while(e && 1 !== e.nodetype) e = e.previoussibling; return e; } }); } polyfill for internet explorer 9+ and safari // source: https://github.com/jserz/js_piece/blob/master/dom/nondocumenttypechildnode/previouselementsibling/previouselementsibling.md (function (arr) { arr.foreach(function (item) { if (item.hasownproperty('previouselementsibling')) { return; } object.defineproperty(it...
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PointerEvent.pointerType - Web APIs
the pointertype read-only property of the pointerevent interface indicates the device type (mouse, pen, or touch) that caused a given pointer event. syntax var ptype = pointerevent.pointertype; return value ptype the event's pointer type. the supported values are the following strings: "mouse" the event was generated by a mouse device. "pen" the event was generated by a pen or stylus device. "touch" the event was generated by a touch, such as a finger. if the device type cannot be detected by the browser, the value can be an empty string (""). if the browser supports pointer device types other than those listed above, the value should be vendor-prefixed to avoid conflicting names for different types of devices. example this example illustrates using the value of...
... "touch" the event was generated by a touch, such as a finger. if the device type cannot be detected by the browser, the value can be an empty string (""). if the browser supports pointer device types other than those listed above, the value should be vendor-prefixed to avoid conflicting names for different types of devices. example this example illustrates using the value of the pointertype property to call the appropriate pointer type processing function. ...
...browser supports pointer device types other than those listed above, the value should be vendor-prefixed to avoid conflicting names for different types of devices. example this example illustrates using the value of the pointertype property to call the appropriate pointer type processing function. ...
...And 3 more matches

WebGL types - Web APIs
the following types are used in webgl interfaces. webgl 1 these types are used within a webglrenderingcontext. type web idl type description glenum unsigned long used for enums. see also the list of constants. glboolean boolean a boolean. glbitfield unsigned long a bit field that stores multiple, logical bits. used for example in webglrenderingcontext.clear(). glbyte byte 8-bit twos complement signed integer. glshort short 16-bit twos complement signed integer. glint long 32-bit twos complement signed integer. glsizei long used for sizes (e.g. width and height of the drawing buffer). glintptr long long special type for pointer arithmetic. glsizeipt...
... glbyte byte 8-bit twos complement signed integer. glshort short 16-bit twos complement signed integer. glint long 32-bit twos complement signed integer. glsizei long used for sizes (e.g. width and height of the drawing buffer). glintptr long long special type for pointer arithmetic. glsizeiptr long long special type for pointer arithmetic. glubyte octet 8-bit twos complement unsigned integer. glushort unsigned short 16-bit twos complement unsigned integer. gluint unsigned long 32-bit twos complement unsigned integer. glfloat unrestricted float 32-bit ieee floating point number. glclampf unrestricted float clamped 32-bit ieee floating ...
...ubyte octet 8-bit twos complement unsigned integer. glushort unsigned short 16-bit twos complement unsigned integer. gluint unsigned long 32-bit twos complement unsigned integer. glfloat unrestricted float 32-bit ieee floating point number. glclampf unrestricted float clamped 32-bit ieee floating point number. webgl 2 these types are used within a webgl2renderingcontext. all webgl 1 types are used as well. type web idl type description glint64 long long signed 64-bit integer number. webgl extensions these types are used within webgl extensions. type web idl type description gluint64ext long long unsigned 64-bit integer number. specifications ...
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XPathResult.resultType - Web APIs
the read-only resulttype property of the xpathresult interface represents the type of the result, as defined by the type constants. note: this feature is available in web workers. syntax var resulttype = result.resulttype; return value an integer value representing the type of the result, as defined by the type constants. constants result type defined constant value description any_type 0 a result set containing whatever type naturally results from evaluation of the expression. note that if the result is a node-set then unordered_node_iterator_type is always the resulting type. number_type 1 a result containing a single number. this is useful for example, in an xpath expression using the count() function. ...
... description any_type 0 a result set containing whatever type naturally results from evaluation of the expression. note that if the result is a node-set then unordered_node_iterator_type is always the resulting type. number_type 1 a result containing a single number. this is useful for example, in an xpath expression using the count() function. string_type 2 a result containing a single string. boolean_type 3 a result containing a single boolean value. this is useful for example, in an xpath expression using the not() function. unordered_node_iterator_type 4 a result node-set containing all the nodes matching the expression. the nodes may not necessarily be in the same order that they appear in the document. ...
...g a single string. boolean_type 3 a result containing a single boolean value. this is useful for example, in an xpath expression using the not() function. unordered_node_iterator_type 4 a result node-set containing all the nodes matching the expression. the nodes may not necessarily be in the same order that they appear in the document. ordered_node_iterator_type 5 a result node-set containing all the nodes matching the expression. the nodes in the result set are in the same order that they appear in the document. unordered_node_snapshot_type 6 a result node-set containing snapshots of all the nodes matching the expression. the nodes may not necessarily be in the same order that they appear in the document. ordered_node_snaps...
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:first-of-type - CSS: Cascading Style Sheets
note that the universal selector (*) is implied when no simple selector is written. ...
...note that the universal selector (*) is implied when no simple selector is written. ...
...note that the universal selector (*) is implied when no simple selector is written. ...
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:last-of-type - CSS: Cascading Style Sheets
note that the universal selector (*) is implied when no simple selector is written. ...
...note that the universal selector (*) is implied when no simple selector is written. ...
...note that the universal selector (*) is implied when no simple selector is written. ...
...And 3 more matches

:nth-of-type() - CSS: Cascading Style Sheets
the :nth-of-type() css pseudo-class matches elements of a given type (tag name), based on their position among a group of siblings. /* selects every fourth <p> element among any group of siblings */ p:nth-of-type(4n) { color: lime; } syntax the nth-of-type pseudo-class is specified with a single argument, which represents the pattern for matching elements. see :nth-child for a more detailed explanation of its syntax. ...
...f a given type (tag name), based on their position among a group of siblings. /* selects every fourth <p> element among any group of siblings */ p:nth-of-type(4n) { color: lime; } syntax the nth-of-type pseudo-class is specified with a single argument, which represents the pattern for matching elements. see :nth-child for a more detailed explanation of its syntax. ...
...ld for a more detailed explanation of its syntax. ...
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scroll-snap-type-x - CSS: Cascading Style Sheets
mandatory the visual viewport of this scroll container will rest on a snap point if it isn't currently scrolled horizontally. ...
... mandatory the visual viewport of this scroll container will rest on a snap point if it isn't currently scrolled horizontally. ...
... mandatory the visual viewport of this scroll container will rest on a snap point if it isn't currently scrolled horizontally. ...
...And 3 more matches

scroll-snap-type-y - CSS: Cascading Style Sheets
mandatory the visual viewport of this scroll container will rest on a snap point if it isn't currently scrolled vertically. ...
... mandatory the visual viewport of this scroll container will rest on a snap point if it isn't currently scrolled vertically. ...
... mandatory the visual viewport of this scroll container will rest on a snap point if it isn't currently scrolled vertically. ...
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Common MIME types - HTTP
here is a list of mime types, associated by type of documents, ordered by their common extensions. two primary mime types are important for the role of default types: text/plain is the default value for textual files. a textual file should be human-readable and must not contain binary data. application/octet-stream is the default value for all other cases. an unknown file type should use this type. browsers pay a particular care when manipulating these files, attempting to safeguard the user to prevent dangerous behaviors. iana is the official registry of mime media types and maintains a list of all the official mime types. ...
...ontain binary data. application/octet-stream is the default value for all other cases. an unknown file type should use this type. browsers pay a particular care when manipulating these files, attempting to safeguard the user to prevent dangerous behaviors. iana is the official registry of mime media types and maintains a list of all the official mime types. ...
...for all other cases. an unknown file type should use this type. browsers pay a particular care when manipulating these files, attempting to safeguard the user to prevent dangerous behaviors. iana is the official registry of mime media types and maintains a list of all the official mime types. ...
...And 3 more matches

CSP: plugin-types - HTTP
the http content-security-policy (csp) plugin-types directive restricts the set of plugins that can be embedded into a document by limiting the types of resources which can be loaded. instantiation of an <embed>, <object> or <applet> element will fail if: the element to load does not declare a valid mime type, the declared type does not match one of specified types in the plugin-types directive, the fetched resource does not match the declared type. csp version 2 directive type document directive default-src fallback no. not setting this allows anything. ...
...ement will fail if: the element to load does not declare a valid mime type, the declared type does not match one of specified types in the plugin-types directive, the fetched resource does not match the declared type. csp version 2 directive type document directive default-src fallback no. not setting this allows anything. syntax one or more mime types can be set for the plugin-types policy: content-security-policy: plugin-types <type>/<subtype>; content-security-policy: plugin-types <type>/<subtype> <type>/<subtype>; <type>/<subtype> a valid mime type. ...
...ng. syntax one or more mime types can be set for the plugin-types policy: content-security-policy: plugin-types <type>/<subtype>; content-security-policy: plugin-types <type>/<subtype> <type>/<subtype>; <type>/<subtype> a valid mime type. examples disallowing plugins to disallow all plugins, the object-src directive should be set to 'none' which will disallow plugins. the plugin-types directive is only used if you are allowing plugins with object-src at all. ...
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TypeError: can't redefine non-configurable property "x" - JavaScript
the configurable attribute controls whether the property can be deleted from the object and whether its attributes (other than writable) can be changed. ...
...the configurable attribute controls whether the property can be deleted from the object and whether its attributes (other than writable) can be changed. ...
...the configurable attribute controls whether the property can be deleted from the object and whether its attributes (other than writable) can be changed. ...
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TypeError: can't delete non-configurable array element - JavaScript
when shortening an array, the elements beyond the new array length will be deleted, which failed in this situation. ...
...when shortening an array, the elements beyond the new array length will be deleted, which failed in this situation. ...
...when shortening an array, the elements beyond the new array length will be deleted, which failed in this situation. ...
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TypeError: Reduce of empty array with no initial value - JavaScript
the javascript exception "reduce of empty array with no initial value" occurs when a reduce function is used. message typeerror: reduce of empty array with no initial value error type typeerror what went wrong? in javascript, there are several reduce functions: array.prototype.reduce(), array.prototype.reduceright() and typedarray.prototype.reduce(), typedarray.prototype.reduceright()). these functions optionally take an initialvalue (which will be used as the first argument to the first call of the callback). however, if no initial value is provided, it will use the first element of the array or typedarray as the initial value. this error is raised when an empty array is provided because no initial value can be returned in that case. examples invalid cases this problem appea...
...thus leaving none to be used as the initial value. ...
...thus leaving none to be used as the initial value. ...
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Array.prototype.findIndex() - JavaScript
cation of callback. callback will not process the elements appended to the array after the call to findindex() begins. if an existing, unvisited element of the array is changed by callback, its value passed to the callback will be the value at the time findindex() visits the element's index. elements that are deleted are still visited. polyfill // https://tc39.github.io/ecma262/#sec-array.prototype.findindex if (!array.prototype.findindex) { object.defineproperty(array.prototype, 'findindex', { value: function(predicate) { // 1. let o be ? toobject(this value). if (this == null) { throw new typeerror('"this" is null or not defined'); } var o = object(this); // 2. let len be ? tolength(? get(o, "length")). var len = o.length >>> 0; //...
...if thisarg was supplied, let t be thisarg; else let t be undefined. var thisarg = arguments[1]; // 5. let k be 0. var k = 0; // 6. repeat, while k < len while (k < len) { // a. ...
...if thisarg was supplied, let t be thisarg; else let t be undefined. var thisarg = arguments[1]; // 5. let k be 0. var k = 0; // 6. repeat, while k < len while (k < len) { // a. let pk be ! tostring(k). // b. let kvalue be ? get(o, pk). ...
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Array.prototype.forEach() - JavaScript
to execute side effects at the end of a chain. foreach() does not mutate the array on which it is called. (however, callback may do so) there is no way to stop or break a foreach() loop other than by throwing an exception. if you need such behavior, the foreach() method is the wrong tool. early termination may be accomplished with: a simple for loop a for...of / for...in loops array.prototype.every() array.prototype.some() array.prototype.find() array.prototype.findindex() array methods: every(), some(), find(), and findindex() test the array elements with a predicate returning a truthy value to determine if further iteration is required. foreach expects a synchronous function foreach does not wait for promises. kindly make sure you are aware of the implications while using pr...
...e.log('a[' + index + '] = ' + element) } // notice that index 2 is skipped, since there is no item at // that position in the array... [2, 5, , 9].foreach(logarrayelements) // logs: // a[0] = 2 // a[1] = 5 // a[3] = 9 using thisarg the following (contrived) example updates an object's properties from each entry in the array: function counter() { this.sum = 0 this.count = 0 } counter.prototype.add = function(array) { array.foreach((entry) => { this.sum += entry ++this.count }, this) // ^---- note } const obj = new counter() obj.add([2, 5, 9]) obj.count // 3 obj.sum // 16 since the thisarg parameter (this) is provided to foreach(), it is passed to callback each time it's invoked. the callback uses it as its this value. note: if passing the callback function uses an ar...
...as its this value. note: if passing the callback function uses an arrow function expression, the thisarg parameter can be omitted, since all arrow functions lexically bind the this value. an object copy function the following code creates a copy of a given object. there are different ways to create a copy of an object. ...
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Intl.Locale.prototype.collation - JavaScript
the intl.locale.prototype.collation property is an accessor property that returns the collation type for the locale, which is used to order strings according to the locale's rules. description collation is the process of ordering strings of characters. it is used whenever strings must be sorted and placed into a certain order, from search query results to ordering records in a database. while the idea of placing strings in order might seem trivial, the idea of order can vary from region to region and language to language. the collation property helps to make it easier for javascript programmers to access the collation type used by a particular locale. below is a table with the available collation types, taken from the unicode collation specification. ...
... database. while the idea of placing strings in order might seem trivial, the idea of order can vary from region to region and language to language. the collation property helps to make it easier for javascript programmers to access the collation type used by a particular locale. below is a table with the available collation types, taken from the unicode collation specification. valid collation types collation type description big5han pinyin ordering for latin, big5 charset ordering for cjk characters (used in chinese) compat a previous version of the ordering, for compatibility dict dictionary style ordering (such as in sinhala) the direct collation type has been deprected. do not use. direct binary cod...
...ring for latin, gb2312han charset ordering for cjk characters (used in chinese) phonebk phonebook style ordering (such as in german) phonetic phonetic ordering (sorting based on pronunciation) pinyin pinyin ordering for latin and for cjk characters (used in chinese) reformed reformed ordering (such as in swedish) search special collation type for string search searchjl special collation type for korean initial consonant search standard default ordering for each language stroke pinyin ordering for latin, stroke order for cjk characters (used in chinese) trad traditional style ordering (such as in spanish) unihan pinyin ordering for latin, unihan radical-stroke ordering for cjk...
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Object.prototype.propertyIsEnumerable() - JavaScript
parameters prop the name of the property to test. return value a boolean indicating whether the specified property is enumerable and is the object's own property. description every object has a propertyisenumerable method. this method can determine whether the specified property in an object can be enumerated by a for...in loop, with the exception of properties inherited through the prototype chain. if the object does not have the specified property, this method returns false. examples a basic use of propertyisenumerable the following example shows the use of propertyisenumerable on objects and arrays: var o = {}; var a = []; o.prop = 'is enumerable'; a[0] = 'is enumerable'; o.propertyisenumerable('prop'); // returns true a.propertyisenumerable(0); // returns true user...
...); // returns true a.propertyisenumerable('length'); // returns false math.propertyisenumerable('random'); // returns false this.propertyisenumerable('math'); // returns false direct vs. ...
...rtyisenumerable('math'); // returns false direct vs. ...
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Media type and format guide: image, audio, and video content - Web media technologies
ncluded support for some form of visual media presentation. originally, these capabilities were limited, and were expanded organically, with different browsers finding their own solutions to the problems around including still and video imagery on the web. the modern web has powerful features to support the presentation and manipulation of media, with several media-related apis supporting various types of content. generally, the media formats supported by a browser are entirely up to the browser's creators, which can complicate the work of a web developer. this guide provides an overview of the media file types, codecs, and algorithms that may comprise media used on the web. it also provides browser support information for various combinations of these, and suggestions for prioritization of f...
...d by a browser are entirely up to the browser's creators, which can complicate the work of a web developer. this guide provides an overview of the media file types, codecs, and algorithms that may comprise media used on the web. it also provides browser support information for various combinations of these, and suggestions for prioritization of formats, as well as which formats excel at specific types of content. ...
...s, which can complicate the work of a web developer. this guide provides an overview of the media file types, codecs, and algorithms that may comprise media used on the web. it also provides browser support information for various combinations of these, and suggestions for prioritization of formats, as well as which formats excel at specific types of content. references images image file type and format guide covers support of image file types and content formats across the major web browsers, as well as providing basic information about each type: benefits, limitations, and use cases of interest to web designers and developers. ...
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toolbarbutton.type - Archive of obsolete content
« xul reference home type type: string the type of button. if this attribute is not present, a normal button is created. you can set this attribute to the value menu to create a button with a menu popup. this will typically cause the button to be displayed differently. menu: set the type attribute to the value menu to create a button with a menu popup. place a menupopup element inside the button in this case. the user may click anywhere on the button to open and close the menu. menu-button: you can also use the value menu-button to create a button with a menu. unlike the menu type, this type requires the user to press the arrow to open the menu, but a different command may be invoked when the main part of the button is pressed. ...
...e a menupopup element inside the button in this case. the user may click anywhere on the button to open and close the menu. menu-button: you can also use the value menu-button to create a button with a menu. unlike the menu type, this type requires the user to press the arrow to open the menu, but a different command may be invoked when the main part of the button is pressed. checkbox: use this type to create a toggle button which will switch the checked state each time the button is pressed. radio: use this type to create a radio button. ...
...nu. unlike the menu type, this type requires the user to press the arrow to open the menu, but a different command may be invoked when the main part of the button is pressed. checkbox: use this type to create a toggle button which will switch the checked state each time the button is pressed. radio: use this type to create a radio button. you can also create a group of toolbarbuttons using this type and the attribute group. ...
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toolkit.singletonWindowType - Archive of obsolete content
if such a window is found, it will be re-used, otherwise a new window will be opened. more information on this can be found in bug 317811. ...
...if such a window is found, it will be re-used, otherwise a new window will be opened. more information on this can be found in bug 317811. ...
...if such a window is found, it will be re-used, otherwise a new window will be opened. more information on this can be found in bug 317811. ...
...And 2 more matches

Visual typescript game engine - Game development
text editor used and recommended: visual studio code. luanch debugger configuration comes with this project. physics engine based on matter.js. multiplatform video chat (for all browsers) implemented. socketio used for session staff. multirtc2 used for data transfer also for video chat. multirtc3 alias 'broadcaster' used for video chat. client part to make all dependency works in build process we need some plugins. npm install npm run build navigate in browser /build/app.html to see client app in action -the client part is a browser web application. ...
...m elements. */ private addson: addson = [ { name: "cache", enabled: true, scriptpath: "externals/cacheinit.ts", }, { name: "hackertimer", enabled: true, scriptpath: "externals/hack-timer.js", }, { name: "dragging", enabled: true, scriptpath: "externals/drag.ts", }, ]; /** * @description this is main coordinary types of positions * can be "diametric-fullscreen" or "frame". * @property drawreference * @type string */ private drawreference: string = "frame"; /** * aspectratio default value, can be changed in run time. */ private aspectratio: number = 1.333; /** * domain is simple url address, * recommendent to use for local propose lan ip * like : 192.168.0.xxx if you wann...
...| ├── examples/ | | ├── platformer/ | ├── html-components/ | | ├── register.html | | ├── login.html | | ├── games-list.html | | ├── user-profile.html | | ├── store.html | | ...
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IPDL Type Serialization
all types used in ipdl must be serializable. this is accomplished through type specialization of a c++ traits class. types are serialized and deserialized from an ipc::message type declared in ipc_message.h. each type specializes ipc::paramtraits as follows: namespace ipc { template <> struct paramtraits<mytype> { typedef mytype paramtype; static void write(message* amsg, const paramtype& aparam) { // implement serialization here } static bool read(const message* amsg, void** aiter, paramtype* aresult) { // implement deserialization here. return false if deserialization failed } }; } // namespace ipc the standard ipdl types (integers, floats, and xpcom strings) already have serializers. other types need to have serializers written for them explicitly. in man...
...ipdl types (integers, floats, and xpcom strings) already have serializers. other types need to have serializers written for them explicitly. in many cases a serializer can be written by combining existing serializers. ...
...s, and xpcom strings) already have serializers. other types need to have serializers written for them explicitly. in many cases a serializer can be written by combining existing serializers. ...
...And 2 more matches

Blob.type - Web APIs
the type property of a blob object returns the mime type of the file. syntax var mimetype = blob.type value a domstring containing the file's mime type, or an empty string if the type could not be determined. example this example asks the user to select a number of files, then checks each file to make sure it's one of a given set of image file types. ...
... the type property of a blob object returns the mime type of the file. syntax var mimetype = blob.type value a domstring containing the file's mime type, or an empty string if the type could not be determined. example this example asks the user to select a number of files, then checks each file to make sure it's one of a given set of image file types. ...
...mime type of the file. syntax var mimetype = blob.type value a domstring containing the file's mime type, or an empty string if the type could not be determined. example this example asks the user to select a number of files, then checks each file to make sure it's one of a given set of image file types. var i, fileinput, files, allowedfiletypes; // fileinput is a htmlinputelement: <input type="file" multiple id="myfileinput"> fileinput = document.getelementbyid("myfileinput"); // files is a filelist object (simliar to nodelist) files = fileinput.files; // our application only allows gif, png, and jpeg images allowedfiletypes = ["image/png", "image/jpeg", "image/gif"]; for (i = 0; i < files.length; i++) { // test if file.type is an allowed file type. ...
...And 2 more matches

HTMLStyleElement.type - Web APIs
the htmlstyleelement.type read-only property returns the type of the current style. ...
... the htmlstyleelement.type read-only property returns the type of the current style. ...
... the htmlstyleelement.type read-only property returns the type of the current style. ...
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MediaSource.isTypeSupported() - Web APIs
the mediasource.istypesupported() static method returns a boolean value which is true if the given mime type is likely to be supported by the current user agent. that is, if it can successfully create sourcebuffer objects for that mime type. if the returned value is false, then the user agent is certain that it cannot access media of the specified format. syntax var isitsupported = mediasource.istypesupported(mimetype); parameters mimetype the mime media type that you want to test support for in the current browser. this may include the codecs parameter to provide added details about the codecs used within the file. return value a boolean which is true if the browser feels that it can probably play media of the specified type. this is not a guarantee, however, and your code must be ...
...include the codecs parameter to provide added details about the codecs used within the file. return value a boolean which is true if the browser feels that it can probably play media of the specified type. this is not a guarantee, however, and your code must be prepared for the possibility that the media will not play correctly if at all. a value of false is a guarantee that media of the given type will not play, however. all web apis that work with media files use a "no/maybe/probably" approach (or, in this case, "no or probably") when determining if a media type can be used. this is because media files are complex, intricate constructs with far too many subtle variations to be absolutely certain of anything until you actually use the contents of the media. example the following snippet...
...the media. ...
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NonDocumentTypeChildNode.nextElementSibling - Web APIs
the nondocumenttypechildnode.nextelementsibling read-only property returns the element immediately following the specified one in its parent's children list, or null if the specified element is the last one in the list. ...
... the nondocumenttypechildnode.nextelementsibling read-only property returns the element immediately following the specified one in its parent's children list, or null if the specified element is the last one in the list. ...
...lowing into the console when it loads: siblings of div-01: div script polyfill for internet explorer 8 this property is unsupported prior to ie9, so the following snippet can be used to add support to ie8: // source: https://github.com/alhadis/snippets/blob/master/js/polyfills/ie8-child-elements.js if(!("nextelementsibling" in document.documentelement)){ object.defineproperty(element.prototype, "nextelementsibling", { get: function(){ var e = this.nextsibling; while(e && 1 !== e.nodetype) e = e.nextsibling; return e; } }); } polyfill for internet explorer 9+ and safari // source: https://github.com/jserz/js_piece/blob/master/dom/nondocumenttypechildnode/nextelementsibling/nextelementsibling.md (function (arr) { ...
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PerformanceResourceTiming.initiatorType - Web APIs
the initiatortype read-only property is a string that represents the type of resource that initiated the performance event. the value of this string is as follows: if the initiator is a element, the property returns the element's localname. if the initiator is a css resource, the property returns "css". if the initiator is a xmlhttprequest object, the property returns "xmlhttprequest". if the initiator is a performancenavigationtiming object, the property returns an empty string (""). note: this feature is available in web workers. syntax resource.initiatortype; return value a string representing the type of resource that initiated the performance event, as specified above. ...
...ty returns "xmlhttprequest". if the initiator is a performancenavigationtiming object, the property returns an empty string (""). note: this feature is available in web workers. syntax resource.initiatortype; return value a string representing the type of resource that initiated the performance event, as specified above. ...
...ming object, the property returns an empty string (""). note: this feature is available in web workers. syntax resource.initiatortype; return value a string representing the type of resource that initiated the performance event, as specified above. ...
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RTCIceCandidate.tcpType - Web APIs
"active" the transport will try to open an outbound connection but won't receive inoming connection requests. "passive" the transport will receive incoming connection requests but won't try to open an outbound connection. ...
... "active" the transport will try to open an outbound connection but won't receive inoming connection requests. "passive" the transport will receive incoming connection requests but won't try to open an outbound connection. ...
... "active" the transport will try to open an outbound connection but won't receive inoming connection requests. "passive" the transport will receive incoming connection requests but won't try to open an outbound connection. ...
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RTCIceCandidateStats.candidateType - Web APIs
srflx the candidate is a server reflexive candidate; the ip indicates an intermediary address assigned by the stun server to represent the candidate's peer anonymously. ...
... srflx the candidate is a server reflexive candidate; the ip indicates an intermediary address assigned by the stun server to represent the candidate's peer anonymously. ...
... srflx the candidate is a server reflexive candidate; the ip indicates an intermediary address assigned by the stun server to represent the candidate's peer anonymously. ...
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RTCStatsType - Web APIs
values candidate-pair an rtcicecandidatepairstats object providing statistics related to an rtcicetransport. candidate pairs other than the currently active pair for the transport are deleted when the rtcpeerconnection changes its rtcpeerconnection.icegatheringstate to new during an ice restart. the active candidate pair is deleted after the transport switches to another candidate pair; this change cannot be detected otherwise. ...
...n's rtcpeerconnection. receiver provides statistics about a specific rtcrtpreceiver. the statistics object is an rtcaudioreceiverstats object if kind is audio; if kind is video, the object is an rtcvideoreceiverstats object. remote-candidate the report is an rtcicecandidatestats object containing statistics about the remote candidate's rtcicetransport. this may include information such as the type of network, the protocol, the url, the type of relay being used, and so forth. remote-inbound-rtp the report is an rtcremoteinboundrtpstreamstats object providing statistics about your outbound rtp data stream, but from the perspective of the remote peer. that is, this information is about your outbound-rtp stream, but as seen by the remote device that's handling the stream. you can use this in...
...things like determine how well the remote peer is receiving data. remote-outbound-rtp the report is an rtcremoteoutboundrtpstreamstats object that contains statistics about your inbound rtp (inbound-rtp) stream, but from the perspective of the remote peer. sender an object containing statistics about the rtcrtpsender for a stream on the rtcpeerconnection. ...
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Response.type - Web APIs
opaque: response for “no-cors” request to cross-origin resource. severely restricted. opaqueredirect: the fetch request was made with redirect: "manual". the response's status is 0, headers are empty, body is null and trailer is empty. ...
... one of the following: basic: normal, same origin response, with all headers exposed except “set-cookie” and “set-cookie2″. cors: response was received from a valid cross-origin request. certain headers and the body may be accessed. error: network error. no useful information describing the error is available. the response’s status is 0, headers are empty and immutable. this is the type for a response obtained from response.error(). opaque: response for “no-cors” request to cross-origin resource. severely restricted. opaqueredirect: the fetch request was made with redirect: "manual". the response's status is 0, headers are empty, body is null and trailer is empty. note: an "error" response never really gets exposed to script: such a response to a fetch() would reject th...
...om response.error(). opaque: response for “no-cors” request to cross-origin resource. severely restricted. opaqueredirect: the fetch request was made with redirect: "manual". the response's status is 0, headers are empty, body is null and trailer is empty. note: an "error" response never really gets exposed to script: such a response to a fetch() would reject the promise. syntax var mytype = response.type; value a responsetype string indicating the type of the response. example in our fetch response example (see fetch response live) we create a new request object using the request() constructor, passing it a jpg path. we then fetch this request using fetch(), extract a blob from the response using body.blob, create an object url out of it using url.createobjecturl, and display ...
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SVGUnitTypes - Web APIs
the svgunittypes interface defines a commonly used set of constants used for reflecting gradientunits, patterncontentunits and other similar attributes. ...
...units, patterncontentunits and other similar attributes. ...
...absolute; top: 0; left: 0;" viewbox="-50 0 600 70" preserveaspectratio="xminymin meet"><a xlink:href="/docs/web/api/svgunittypes" target="_top"><rect x="1" y="1" width="120" height="50" fill="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="61" y="30" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">svgunittypes</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} constants name value description svg_unit_type_unknown 0 the type is not one of predefined types. ...
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XMLHttpRequest.responseType - Web APIs
the xmlhttprequest property responsetype is an enumerated string value specifying the type of data contained in the response. it also lets the author change the response type. if an empty string is set as the value of responsetype, the default value of text is used. syntax var type = xmlhttprequest.responsetype; xmlhttprequest.responsetype = type; value a string taken from the xmlhttprequestresponsetype enum which specifies what type of data the response contains. when setting responsetype to a particular value, the author should make sure that the server is actually sending a response compatible with that format. if the server returns data that is not compatible with the responsetype that was set, the value of response will be null. ...
...xmlhttprequestresponsetype enum which specifies what type of data the response contains. when setting responsetype to a particular value, the author should make sure that the server is actually sending a response compatible with that format. if the server returns data that is not compatible with the responsetype that was set, the value of response will be null. the values supported by responsetype are the following: "" an empty responsetype string is treated the same as "text", the default type. arraybuffer the response is a javascript arraybuffer containing binary data. blob the response is a blob object containing the binary data. document the response is an html document or xml xmldocument, as appropriate based on the mime type of the received data. see html in xmlhttprequest ...
...ml document or xml xmldocument, as appropriate based on the mime type of the received data. see html in xmlhttprequest to learn more about using xhr to fetch html content. json the response is a javascript object created by parsing the contents of received data as json. text the response is a text in a domstring object. ms-stream the response is part of a streaming download; this response type is only allowed for download requests, and is only supported by internet explorer. exceptions invalidaccesserror an attempt was made to change the value of responsetype on anxmlhttprequest which is in synchronous mode but not in a worker. for additional details, see synchronous xhr restrictions below. ...
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Array.prototype.lastIndexOf() - JavaScript
lastindexof was added to the ecma-262 standard in the 5th edition; as such it may not be present in other implementations of the standard. you can work around this by inserting the following code at the beginning of your scripts, allowing use of lastindexof in implementations which do not natively support it. ...
... the beginning of your scripts, allowing use of lastindexof in implementations which do not natively support it. this algorithm is exactly the one specified in ecma-262, 5th edition, assuming object, typeerror, number, math.floor, math.abs, and math.min have their original values. ...
...llowing use of lastindexof in implementations which do not natively support it. this algorithm is exactly the one specified in ecma-262, 5th edition, assuming object, typeerror, number, math.floor, math.abs, and math.min have their original values. ...
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Array.prototype.values() - JavaScript
the values() method returns a new array iterator object that contains the values for each index in the array. syntax arr.values() return value a new array iterator object. ...
...ew array iterator object that contains the values for each index in the array. syntax arr.values() return value a new array iterator object. examples iteration using for...of loop var arr = ['a', 'b', 'c', 'd', 'e']; var iterator = arr.values(); for (let letter of iterator) { console.log(letter); } //"a" "b" "c" "d" "e" array.prototype.values is default implementation of array.prototype[symbol.iterator]. ...
...ins the values for each index in the array. syntax arr.values() return value a new array iterator object. examples iteration using for...of loop var arr = ['a', 'b', 'c', 'd', 'e']; var iterator = arr.values(); for (let letter of iterator) { console.log(letter); } //"a" "b" "c" "d" "e" array.prototype.values is default implementation of array.prototype[symbol.iterator]. ...
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Intl.DisplayNames.prototype.of() - JavaScript
ing based on the locale and options provided when instantiating intl.displaynames. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. ...
...locale and options provided when instantiating intl.displaynames. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. ...
... repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax displaynames.of(code); parameters code the code to provide depends on the type: if the type is "region", code should be either an iso-3166 two letters region code, or a three digits un m49 geographic regions. if the type is "script", code should be an iso-15924 four letters script code. if the type is "language", code should be a languagecode ["-" scriptcode] ["-" regioncode ] *("-" variant ) subsequence of the unicode_language_id grammar in uts 35's unicode language and locale identifiers grammar. languagecode is either a two letters iso 639-1 language code or a three letters iso 639-2 language code. if the ...
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Intl.NumberFormat.prototype.formatToParts() - JavaScript
the intl.numberformat.prototype.formattoparts() method allows locale-aware formatting of strings produced by numberformat formatters. syntax intl.numberformat.prototype.formattoparts(number) parameters number optional a number or bigint to format. return value an array of objects containing the formatted number in parts. description the formattoparts() method is useful for custom formatting of number strings. it returns an array of objects containing the locale-specific tokens from which it possible to build custom strings while preserving the locale-specific parts. ...
...turn value an array of objects containing the formatted number in parts. description the formattoparts() method is useful for custom formatting of number strings. it returns an array of objects containing the locale-specific tokens from which it possible to build custom strings while preserving the locale-specific parts. the structure the formattoparts() method returns, looks like this: [ { type: "integer", value: "3" }, { type: "group", value: "." }, { type: "integer", value: "500" } ] possible types are the following: currency the currency string, such as the symbols "$" and "€" or the name "dollar", "euro" depending on how currencydisplay is specified. decimal the decimal separator string ("."). fraction the fraction number. group the group separator string (","). in...
...mat('de-de', { style: 'currency', currency: 'eur' }); formatter.format(number); // "3.500,00 €" however, in many user interfaces there is a desire to customize the formatting of this string. the formattoparts method enables locale-aware formatting of strings produced by numberformat formatters by providing you the string in parts: formatter.formattoparts(number); // return value: [ { type: "integer", value: "3" }, { type: "group", value: "." }, { type: "integer", value: "500" }, { type: "decimal", value: "," }, { type: "fraction", value: "00" }, { type: "literal", value: " " }, { type: "currency", value: "€" } ] now the information is available separately and it can be formatted and concatenated again in a customized way. for example by using arra...
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Object.prototype.hasOwnProperty() - JavaScript
ty to test. return value a boolean indicating whether or not the object has the specified property as own property. description all descendents of object inherit the hasownproperty method. this method can be used to determine whether an object has the specified property as a direct property of that object; unlike the in operator, this method does not check for a property in the object's prototype chain. if an object is an array, hasownproperty method can check whether an index exists. note hasownproperty returns true even if the value of the property is null or undefined. o = new object(); o.propone = null; o.hasownproperty('propone'); // returns true o.proptwo = undefined; o.hasownproperty('proptwo'); // returns true examples using hasownproperty to test for a property's existe...
...wnproperty to test for a property's existence the following example determines whether the o object contains a property named prop: o = new object(); o.hasownproperty('prop'); // returns false o.prop = 'exists'; o.hasownproperty('prop'); // returns true direct vs. inherited properties the following example differentiates between direct properties and properties inherited through the prototype chain: o = new object(); o.prop = 'exists'; o.hasownproperty('prop'); // returns true o.hasownproperty('tostring'); // returns false o.hasownproperty('hasownproperty'); // returns false iterating over the properties of an object the following example shows how to iterate over the properties of an object without executing on inherited properties. note that the for...in lo...
... ...
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Object.prototype.toSource() - JavaScript
code is not available: function object() { [native code] } for instances of object, tosource() returns a string representing the source code. you can call tosource() while debugging to examine the contents of an object. overriding the tosource() method it is safe for objects to override the tosource() method. ...
...of an object. overriding the tosource() method it is safe for objects to override the tosource() method. for example: function person(name) { this.name = name; } person.prototype.tosource = function person_tosource() { return 'new person(' + uneval(this.name) + ')'; }; console.log(new person('joe').tosource()); // ---> new person("joe") built-in tosource() methods each core javascript type has its own tosource() method. these objects are: array.prototype.tosource() — array object. boolean.prototype.tosource() — boolean object. date.prototype.tosource() — date object. function.prototype.tosource() — function object. number.prototype.tosource() — number object. regexp.prototype.tosource() — regexp object. string.prototype.tosource() — string object. sym...
... math.tosource() — returns the string "math". limitations on cyclical objects in the case of objects that contain references to themselves, e.g. a cyclically linked list or a tree that can be traversed both ways, tosource() will not recreate the self-reference, as of firefox 24. ...
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String.prototype.trimStart() - JavaScript
. syntax str.trimstart(); str.trimleft(); return value a new string representing the calling string stripped of whitespace from its beginning (left end). description the trimstart() / trimleft() methods return the string stripped of whitespace from its left end. trimleft() or trimstart() do not affect the value of the string itself. ...
...rimstart() / trimleft() methods return the string stripped of whitespace from its left end. trimleft() or trimstart() do not affect the value of the string itself. aliasing for consistency with functions like string.prototype.padstart the standard method name is trimstart. however, for web compatibility reasons, trimleft remains as an alias to trimstart. ...
...sing for consistency with functions like string.prototype.padstart the standard method name is trimstart. however, for web compatibility reasons, trimleft remains as an alias to trimstart. ...
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TypeError() constructor - JavaScript
the typeerror() constructor creates a new error when an operation could not be performed, typically (but not exclusively) when a value is not of the expected type. syntax new typeerror([message[, filename[, linenumber]]]) parameters message optional optional. human-readable description of the error filename optional optional. the name of the file containing the code that caused the exception linenumber optional optional. ...
...usively) when a value is not of the expected type. syntax new typeerror([message[, filename[, linenumber]]]) parameters message optional optional. human-readable description of the error filename optional optional. the name of the file containing the code that caused the exception linenumber optional optional. ...
...rror([message[, filename[, linenumber]]]) parameters message optional optional. human-readable description of the error filename optional optional. the name of the file containing the code that caused the exception linenumber optional optional. ...
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TypedArray.of() - JavaScript
the typedarray.of() method creates a new typed array from a variable number of arguments. this method is nearly the same as array.of(). the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax typedarray.of(element0[, element1[, ...[, elementn]]]) where typedarray is one of: int8array uint8array uint8clampedarray int16array uint16array int32array uint32array float32array float64array bigint64array biguint64array parameters elementn elements of which to create the typed array. return value a new typedarray instance. ...
...hence, when working with proxy objects, it calls handler.set to create new elements rather than handler.defineproperty. ...
...hence, when working with proxy objects, it calls handler.set to create new elements rather than handler.defineproperty. ...
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type - SVG: Scalable Vector Graphics
for the <feturbulence> element, it indicates whether the filter primitive should perform a noise or turbulence function. ...
... for the <feturbulence> element, it indicates whether the filter primitive should perform a noise or turbulence function. ...
... for the <feturbulence> element, it indicates whether the filter primitive should perform a noise or turbulence function. ...
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datepicker.type - Archive of obsolete content
« xul reference home type type: one of the values below you can set the type attribute to one of the values below to specify the type of datepicker to use normal a datepicker with three fields for entering the year, month and date. this is the default value so do not specify the type attribute if this kind is desired. grid a datepicker that displays a calendar grid where one month is shown at a time. popup a datepicker with three entry fields but an additional dropdown button, which, when pressed, will display a popup calendar grid. ...
.... this is the default value so do not specify the type attribute if this kind is desired. grid a datepicker that displays a calendar grid where one month is shown at a time. popup a datepicker with three entry fields but an additional dropdown button, which, when pressed, will display a popup calendar grid. ...
... not specify the type attribute if this kind is desired. grid a datepicker that displays a calendar grid where one month is shown at a time. popup a datepicker with three entry fields but an additional dropdown button, which, when pressed, will display a popup calendar grid. ...
... this kind is desired. ...

editortype - Archive of obsolete content
html an html editor. ...
... html an html editor. ...
... html an html editor. ...
... html an html editor. ...

windowtype - Archive of obsolete content
« xul reference home windowtype type: string set to a string which can be used to identify the type of window. this might be used, for example, to distinguish between a browser window and an editor window. some of mozilla's window handling functions use this attribute to group windows of the same type together. ...
... « xul reference home windowtype type: string set to a string which can be used to identify the type of window. this might be used, for example, to distinguish between a browser window and an editor window. some of mozilla's window handling functions use this attribute to group windows of the same type together. ...
...ndowtype type: string set to a string which can be used to identify the type of window. this might be used, for example, to distinguish between a browser window and an editor window. some of mozilla's window handling functions use this attribute to group windows of the same type together. ...
... type of window. this might be used, for example, to distinguish between a browser window and an editor window. some of mozilla's window handling functions use this attribute to group windows of the same type together. ...

calIFileType - Archive of obsolete content
extensionfilter the extension filter to use in the filepicker's filter list. separate multiple extensions with semicolon and space. ...
...extensionfilter the extension filter to use in the filepicker's filter list. separate multiple extensions with semicolon and space. ...
...extensionfilter the extension filter to use in the filepicker's filter list. separate multiple extensions with semicolon and space. ...
...extensionfilter the extension filter to use in the filepicker's filter list. separate multiple extensions with semicolon and space. ...

Doctype - MDN Web Docs Glossary: Definitions of Web-related terms
in html, the doctype is the required "<!doctype html>" preamble found at the top of all documents. its sole purpose is to prevent a browser from switching into so-called “quirks mode” when rendering a document; that is, the "<!doctype html>" doctype ensures that the browser makes a best-effort attempt at following the relevant specifications, rather than using a different rendering mode that is incompatible with some specifications. ...
...s. its sole purpose is to prevent a browser from switching into so-called “quirks mode” when rendering a document; that is, the "<!doctype html>" doctype ensures that the browser makes a best-effort attempt at following the relevant specifications, rather than using a different rendering mode that is incompatible with some specifications. ...
...dering a document; that is, the "<!doctype html>" doctype ensures that the browser makes a best-effort attempt at following the relevant specifications, rather than using a different rendering mode that is incompatible with some specifications. ...
...l>" doctype ensures that the browser makes a best-effort attempt at following the relevant specifications, rather than using a different rendering mode that is incompatible with some specifications. ...

MIME type - MDN Web Docs Glossary: Definitions of Web-related terms
a mime type (now properly called "media type", but also sometimes "content type") is a string sent along with a file indicating the type of the file (describing the content format, for example, a sound file might be labeled audio/ogg, or an image file image/png). it serves the same purpose as filename extensions traditionally do on windows. the name originates from the mime standard originally used in e-mail. learn more general knowledge internet media type on wikipedia technical reference list of mime types properly configuring server mime types details information about the usage of mime types in a web context. ...
...ng). it serves the same purpose as filename extensions traditionally do on windows. the name originates from the mime standard originally used in e-mail. ...
... filename extensions traditionally do on windows. the name originates from the mime standard originally used in e-mail. ...
...itionally do on windows. the name originates from the mime standard originally used in e-mail. ...

Type, class, and ID selectors - Learn web development
rs that are available, which you will probably use the most in your work. prerequisites: basic computer literacy, basic software installed, basic knowledge of working with files, html basics (study introduction to html), and an idea of how css works (study css first steps.) objective: to learn about the different css selectors we can use to apply css to a document. type selectors a type selector is sometimes referred to as a tag name selector or element selector, because it selects an html tag/element in your document. in the example below we have used the span, em and strong selectors. all instances of <span>, <em> and <strong> elements are therefore styled accordingly. try adding a css rule to select the <h1> element and change its color to blue. the univ...
...ave applied it to several places in my document. all of the elements that have the class applied are highlighted. targeting classes on particular elements you can create a selector that will target specific elements with the class applied. in this next example we will highlight a <span> with a class of highlight differently to an <h1> heading with a class of highlight. we do this by using the type selector for the element i want to target, with the class appended using a dot, with no white space in between. this approach reduces the scope of a rule as the rule will only apply to that particular element & class combination; so you would need to add another selector if you decided the rule should apply to other elements too. target an element if it has more than one class applied you c...
...er class; it needs notebox as well to get anything applied. id selectors an id selector begins with a # rather than a full stop character, but is basically used in the same way as a class selector. an id however can be used only once per document, and elements can only have a single id value applied to them. it can select an element that has the id set on it, and you can precede the id with a type selector to only target the element if both the element and id match. you can see both of these uses in the following example: warning: using the same id multiple times in a document may appear to work for styling purposes, but don't do this. it results in invalid code, and will cause strange behavior in many places. note: as we learned in the lesson on specificity, an id has high specific...
...e element rather than use an id, however if using the id is the only way to target the element — perhaps because you do not have access to the markup and so cannot edit it — this will work. in the next article we'll continue exploring selectors by looking at attribute selectors. ...

JS_GetPrototype
retrieves an object's prototype. syntax bool js_getprototype(jscontext *cx, js::handleobject obj, js::mutablehandleobject protop); name type description cx jscontext * pointer to a js context from which to derive runtime information. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. obj js::handleobject object for which to retrieve the prototype. protop js::mutablehandleobject out parameter. if successful, receives prototype object of obj. description js_getprototype retrieves the prototype of a specified object, obj. a prototype object provides properties inherited by similar js objects. this is the equivalent of object.getprototypeof(obj) from javascript. if js_getprototyp...
...eives prototype object of obj. description js_getprototype retrieves the prototype of a specified object, obj. a prototype object provides properties inherited by similar js objects. this is the equivalent of object.getprototypeof(obj) from javascript. if js_getprototype returns false, that signals an exception, which should be handled as usual. otherwise, it stores a pointer to the prototype or null to *protop and returns true. to set an object's prototype, use js_setprototype. ...
...t provides properties inherited by similar js objects. this is the equivalent of object.getprototypeof(obj) from javascript. if js_getprototype returns false, that signals an exception, which should be handled as usual. otherwise, it stores a pointer to the prototype or null to *protop and returns true. ...
...ties inherited by similar js objects. this is the equivalent of object.getprototypeof(obj) from javascript. if js_getprototype returns false, that signals an exception, which should be handled as usual. otherwise, it stores a pointer to the prototype or null to *protop and returns true. to set an object's prototype, use js_setprototype. ...

File.type - Web APIs
returns the media type (mime) of the file represented by a file object. syntax var name = file.type; value a string, containing the media type(mime) indicating the type of the file, for example "image/png" for png images example <input type="file" multiple onchange="showtype(this)"> function showtype(fileinput) { var files = fileinput.files; for (var i = 0; i < files.length; i++) { var name = files[i].name; var type = files[i].type; alert("filename: " + name + " , type: " + type); } } note: based on the current implementation, browsers won't actually read the bytestream of a file to determine its media type. it is assumed based on the file extension; a png image file renamed to .txt would give "text/plain" and not "image/png". ...
...developers are advised not to rely on this property as a sole validation scheme. ...
...developers are advised not to rely on this property as a sole validation scheme. ...
...e. it is assumed based on the file extension; a png image file renamed to .txt would give "text/plain" and not "image/png". moreover, file.type is generally reliable only for common file types like images, html documents, audio and video. uncommon file extensions would return an empty string. client configuration (for instance, the windows registry) may result in unexpected values even for common types. developers are advised not to rely on this property as a sole validation scheme. specifications specification status comment file apithe definition of 'type' in that specification. working draft initial definition. ...

HTMLSelectElement.type - Web APIs
living standard no change from html5, the latest snapshot. ...
... living standard no change from html5, the latest snapshot. ...
... living standard no change from html5, the latest snapshot. ...
... living standard no change from html5, the latest snapshot. ...

performance.getEntriesByType() - Web APIs
the getentriesbytype() method returns a list of performanceentry objects for a given type. the list's members (entries) can be created by making performance marks or measures (for example by calling the mark() method) at explicit points in time. note: this feature is available in web workers. syntax entries = window.performance.getentriesbytype(type); arguments type the type of entry to retrieve such as "mark". the valid entry types are listed in performanceentry.entrytype. return value entries a list of performanceentry objects that have the specified type. the items will be in chronological order based on the entries' starttime. if no objects have the specified type, or no argument is provided, an empty list is returned. example function useperformanceentrymethods() { ...
...begin"); dowork(50000); performance.mark("end"); performance.mark("begin"); dowork(100000); performance.mark("end"); dowork(200000); performance.mark("end"); // use getentries() to iterate through the each entry var p = performance.getentries(); for (var i=0; i < p.length; i++) { log("entry[" + i + "]"); checkperformanceentry(p[i]); } // use getentries(name, entrytype) to get specific entries p = performance.getentries({name : "begin", entrytype: "mark"}); for (var i=0; i < p.length; i++) { log("begin[" + i + "]"); checkperformanceentry(p[i]); } // use getentriesbytype() to get all "mark" entries p = performance.getentriesbytype("mark"); for (var i=0; i < p.length; i++) { log ("mark only entry[" + i + "]: name = " + p[i].name + ...
... recommendation initial definition. ...
... recommendation initial definition. ...

RTCIceCandidate.type - Web APIs
the rtcicecandidate interface's read-only type specifies the type of candidate the object represents. the type field's value is set when the rtcicecandidate() constructor is used. you can't specify the value of type in the options object, but the address is automatically extracted from the candidate a-line, if it's formatted properly, being taken from its cand-type field. syntax var type = rtcicecandidate.type; value a domstring whose value is one of those defined by the rtcicecandidatetype enumerated type. these candidate types are listed in order of priority; the higher in the list they are, the more efficient they are. host the candidate is a host candidate, whose ip address as specified in the rtcicecandidate.ip property is in fact the true address of the remote peer. srflx t...
...to represent the candidate's peer anonymously. prflx the candidate is a peer reflexive candidate; the ip is an intermediary address assigned by the stun server to represent the candidate's peer anonymously. relay the candidate is a relay candidate, obtained from a turn server. the relay candidate's ip address is an address the turn server uses to forward the media between the two peers. ...
...y. relay the candidate is a relay candidate, obtained from a turn server. the relay candidate's ip address is an address the turn server uses to forward the media between the two peers. if type is null, that information was missing from the candidate's a-line, which will cause rtcpeerconnection.addicecandidate() to throw an operationerror exception. example in this example, the candidate's type is used to present a modified user interface for host candidates (those where the ip refers directly to the remote peer, rather than an intermediary). ...
...n the two peers. if type is null, that information was missing from the candidate's a-line, which will cause rtcpeerconnection.addicecandidate() to throw an operationerror exception. example in this example, the candidate's type is used to present a modified user interface for host candidates (those where the ip refers directly to the remote peer, rather than an intermediary). if (candidate.type == "host") { showhostcontrols(); } else { hidehostcontrols(); } specifications specification status comment webrtc 1.0: real-time communication between browsersthe definition of 'rtcicecandidate.type' in that specification. candidate recommendation initial definition. ...

RTCSessionDescription.type - Web APIs
"answer", the description is the definitive choice in an offer/answer exchange. "pranswer", the description is a provisional answer and may be changed when the definitive choice will be given. "rollback", the description rolls back to offer/answer state to the last stable state. ...
... "answer", the description is the definitive choice in an offer/answer exchange. "pranswer", the description is a provisional answer and may be changed when the definitive choice will be given. "rollback", the description rolls back to offer/answer state to the last stable state. ...
... "answer", the description is the definitive choice in an offer/answer exchange. "pranswer", the description is a provisional answer and may be changed when the definitive choice will be given. "rollback", the description rolls back to offer/answer state to the last stable state. ...
... "answer", the description is the definitive choice in an offer/answer exchange. "pranswer", the description is a provisional answer and may be changed when the definitive choice will be given. "rollback", the description rolls back to offer/answer state to the last stable state. example // the remote description has been set previously on pc, a rtcpeerconnection alert(pc.remotedescription.type); specifications specification status comment webrtc 1.0: real-time communication between browsersthe definition of 'rtcsessiondescription.type' in that specification. candidate recommendation initial specification. ...

XRReferenceSpaceType - Web APIs
the xrreferencespacetype enumerated type defines the strings which identify the types of reference spaces supported by webxr. this type is used when calling the requestreferencespace() method to obtain a reference space for an xrsession. values the reference space returned by xrsession.requestreferencespace() is either xrreferencespace or xrboundedreferencespace. the "interface" column in the table below indicates which of the two types is returned for each reference space type constant.. reference space descriptors the types of reference space are listed in the table below, with brief information about their use cases and which interface is used to implement them. ...
...space() is either xrreferencespace or xrboundedreferencespace. the "interface" column in the table below indicates which of the two types is returned for each reference space type constant.. reference space descriptors the types of reference space are listed in the table below, with brief information about their use cases and which interface is used to implement them. xrreferencespacetype description interface bounded-floor similar to the local type, except the user is not expected to move outside a predetermined boundary, given by the boundsgeometry in the returned object. xrboundedreferencespace local a tracking space whose native origin is located near the viewer's position at the time the session was created. the exact position depends...
...on depends on the underlying platform and implementation. the user isn't expected to move much if at all beyond their starting position, and tracking is optimized for this use case. for devices with six degrees of freedom (6dof) tracking, the local reference space tries to keep the origin stable relative to the environment. xrreferencespace local-floor similar to the local type, except the starting position is placed in a safe location for the viewer to stand, where the value of the y axis is 0 at floor level. if that floor level isn't known, the user agent will estimate the floor level. if the estimated floor level is non-zero, the browser is expected to round it such a way as to avoid fingerprinting (likely to the nearest centimeter). xrreferencespace unbo...
...osition and orientation. this is used for environments in which the user can physically move around, and is supported by all instances of xrsession, both immersive and inline, though it's most useful for inline sessions. it's particularly useful when determining the distance between the viewer and an input, or when working with offset spaces. otherwise, typically, one of the other reference space types will be used more often. xrreferencespace specifications specification status comment webxr device apithe definition of 'xrreferencespacetype' in that specification. working draft initial definition. ...

TypeError: "x" is read-only - JavaScript
the javascript strict mode-only exception "is read-only" occurs when a global variable or object property that was assigned to is a read-only property. message typeerror: assignment to read-only properties is not allowed in strict mode (edge) typeerror: "x" is read-only (firefox) typeerror: 0 is read-only (firefox) typeerror: cannot assign to read only property 'x' of #<object> (chrome) typeerror: cannot assign to read only property '0' of [object array] (chrome) error type typeerror what went wrong? the global variable or object property that was assigned to is a read-only property. (technically, it is a non-writable data property.) this error happens only in strict mode code. in non-strict code, the assignment is silently ignored. examples invalid cases read-only properties are n...
...d-only property. (technically, it is a non-writable data property.) this error happens only in strict mode code. in non-strict code, the assignment is silently ignored. examples invalid cases read-only properties are not super common, but they can be created using object.defineproperty() or object.freeze(). ...
...non-strict code, the assignment is silently ignored. examples invalid cases read-only properties are not super common, but they can be created using object.defineproperty() or object.freeze(). 'use strict'; var obj = object.freeze({name: 'elsa', score: 157}); obj.score = 0; // typeerror 'use strict'; object.defineproperty(this, 'lung_count', {value: 2, writable: false}); lung_count = 3; // typeerror 'use strict'; var frozenarray = object.freeze([0, 1, 2]); frozenarray[0]++; // typeerror there are also a few read-only properties built into javascript. maybe you tried to redefine a mathematical constant. 'use strict'; math.pi = 4; // typeerror sorry, you can't do that. the global variable undefined is also read-only, so you can't silence the infamous "undefined is not a function"...
...zenarray[0]++; // typeerror there are also a few read-only properties built into javascript. maybe you tried to redefine a mathematical constant. 'use strict'; math.pi = 4; // typeerror sorry, you can't do that. ...

TypeError: cannot use 'in' operator to search for 'x' in 'y' - JavaScript
the javascript exception "right-hand side of 'in' should be an object" occurs when the in operator was used to search in strings, or in numbers, or other primitive types. it can only be used to check if a property is in an object. message typeerror: invalid operand to 'in' (edge) typeerror: right-hand side of 'in' should be an object, got 'x' (firefox) typeerror: cannot use 'in' operator to search for 'x' in 'y' (firefox, chrome) error type typeerror what went wrong? the in operator can only be used to check if a property is in an object. you can't search in strings, or in numbers, or other primitive types. ...
...tor to search for 'x' in 'y' (firefox, chrome) error type typeerror what went wrong? ...
... used to check if a property is in an object. you can't search in strings, or in numbers, or other primitive types. examples searching in strings unlike in other programming languages (e.g. python), you can't search in strings using the in operator. "hello" in "hello world"; // typeerror: cannot use 'in' operator to search for 'hello' in 'hello world' instead you will need to use string.prototype.indexof(), for example. "hello world".indexof("hello") !== -1; // true the operand can't be null or undefined make sure the object you are inspecting isn't actually null or undefined. ...
...ngs using the in operator. "hello" in "hello world"; // typeerror: cannot use 'in' operator to search for 'hello' in 'hello world' instead you will need to use string.prototype.indexof(), for example. "hello world".indexof("hello") !== -1; // true the operand can't be null or undefined make sure the object you are inspecting isn't actually null or undefined. var foo = null; "bar" in foo; // typeerror: cannot use 'in' operator to search for 'bar' in 'foo' (chrome) // typeerror: right-hand side of 'in' should be an object, got null (firefox) the in operator always expects an object. var foo = { baz: "bar" }; "bar" in foo; // false "pi" in math; // true "pi" in math; // false searching in arrays be careful when using the in operator to search in array objects. the in operator checks ...

TypeError: 'x' is not iterable - JavaScript
the javascript exception "is not iterable" occurs when the value which is given as the right hand-side of for…of or as argument of a function such as promise.all or typedarray.from, is not an iterable object. message typeerror: 'x' is not iterable (firefox, chrome) typeerror: 'x' is not a function or its return value is not iterable (chrome) error type typeerror what went wrong? the value which is given as the right hand-side of for…of or as argument of a function such as promise.all or typedarray.from, is not an iterable object. an iterable can be a built-in iterable type such as array, string or map, a generator result, or an object implementing the iterable protocol. examples iterating over object properties in javascript, objects are not iterable unless they implement the i...
...erable type such as array, string or map, a generator result, or an object implementing the iterable protocol. examples iterating over object properties in javascript, objects are not iterable unless they implement the iterable protocol. therefore, you cannot use for…of to iterate over the properties of an object. var obj = { 'france': 'paris', 'england': 'london' }; for (let p of obj) { // typeerror: obj is not iterable // … } instead you have to use object.keys or object.entries, to iterate over the properties or entries of an object. var obj = { 'france': 'paris', 'england': 'london' }; // iterate over the property names: for (let country of object.keys(obj)) { var capital = obj[country]; console.log(country, capital); } for (const [country, capital] of object.entrie...
....keys()) { let capital = map[country]; console.log(country, capital); } for (let capital of map.values()) console.log(capital); for (const [country, capital] of map.entries()) console.log(country, capital); iterating over a generator generators are functions you call to produce an iterable object. function* generate(a, b) { yield a; yield b; } for (let x of generate) // typeerror: generate is not iterable console.log(x); when they are not called, the function object corresponding to the generator is callable, but not iterable. calling a generator produces an iterable object which will iterate over the values yielded during the execution of the generator. function* generate(a, b) { yield a; yield b; } for (let x of generate(1,2)) console.log(x); ...
...iterable custom iterables can be created by implementing the symbol.iterator method. you must be certain that your iterator method returns an object which is an iterator, which is to say it must have a next method. ...

Array.prototype.copyWithin() - JavaScript
end copying elements from. copywithin copies up to but not including end. if negative, end will be counted from the end. if end is omitted, copywithin will copy until the last index (default to arr.length). return value the modified array. description the copywithin works like c and c++'s memmove, and is a high-performance method to shift the data of an array. this especially applies to the typedarray method of the same name. the sequence is copied and pasted as one operation; pasted sequence will have the copied values even when the copy and paste region overlap. the copywithin function is intentionally generic, it does not require that its this value be an array object. the copywithin method is a mutable method. it does not alter the length of this, but it will change its content and...
... as one operation; pasted sequence will have the copied values even when the copy and paste region overlap. the copywithin function is intentionally generic, it does not require that its this value be an array object. the copywithin method is a mutable method. it does not alter the length of this, but it will change its content and create new properties, if necessary. polyfill if (!array.prototype.copywithin) { object.defineproperty(array.prototype, 'copywithin', { value: function(target, start/*, end*/) { // steps 1-2. if (this == null) { throw new typeerror('this is null or not defined'); } var o = object(this); // steps 3-5. var len = o.length >>> 0; // steps 6-8. var relativetarget = target >> 0; var to = relativetarget < 0 ? ma...
...19. ...
... ...

Date.prototype.toString() - JavaScript
ed date object. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax dateobj.tostring() return value a string representing the given date. description date instances inherit their tostring() method from date.prototype, not object.prototype. date.prototype.tostring() returns a string representation of the date in the format specified in ecma-262 which can be summarised as: week day: 3 letter english week day name, e.g. "sat" space month name: 3 letter english month name, e.g. "sep" space date: 2 digit day in month, e.g. "01" space year: 4 digit year, e.g. "2018" space hour: 2 digit hour of day, e.g. ...
...eft bracket, i.e. "(" an implementation dependent string representation of the timezone, which might be an abbreviation or full name (there is no standard for names or abbreviations of timezones), e.g. "line islands time" or "lint" right bracket, i.e. ")" e.g. "sat sep 01 2018 14:53:26 gmt+1400 (lint)" until ecmascript 2018 (edition 9), the format of the string returned by date.prototype.tostring was implementation dependent. therefore it should not be relied upon to be in the specified format. the tostring() method is automatically called when a date is to be represented as a text value, e.g. console.log(new date()), or when a date is used in a string concatenation, such as var today = 'today is ' + new date(). tostring() is a generic method, it does not require that its this ...
...g(new date()), or when a date is used in a string concatenation, such as var today = 'today is ' + new date(). tostring() is a generic method, it does not require that its this is a date instance. however, it must have an internal [[timevalue]] property that can't be constructed using native javascript, so it's effectively limited to use with date instances. ...
...ce, a typeerror is thrown. examples using tostring() the following assigns the tostring() value of a date object to myvar: var x = new date(); var myvar = x.tostring(); // assigns a string value to myvar in the same format as: // mon sep 08 1998 14:36:22 gmt-0700 (pdt) specifications specification ecmascript (ecma-262)the definition of 'date.prototype.tostring' in that specification. ...

Error.prototype.toString() - JavaScript
the tostring() method returns a string representing the specified error object. syntax e.tostring() return value a string representing the specified error object. description the error object overrides the object.prototype.tostring() method inherited by all objects. ...
... the tostring() method returns a string representing the specified error object. syntax e.tostring() return value a string representing the specified error object. description the error object overrides the object.prototype.tostring() method inherited by all objects. ...
... syntax e.tostring() return value a string representing the specified error object. description the error object overrides the object.prototype.tostring() method inherited by all objects. ...
... ...

Intl.DateTimeFormat.prototype.formatRangeToParts() - JavaScript
the intl.datetimeformat.prototype.formatrangetoparts() method allows locale-specific tokens representing each part of the formatted date range produced by datetimeformat formatters. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax intl.datetimeformat.prototype.formatrangetoparts(startdate, enddate) examples basic formatrangetoparts usage this method receives two dates and returns an array of objects containing the locale-specific tokens representing each part of the formatted date range. let date1 = new date(date.utc(2007, 0, 10, 10, 0, 0)); let date2 = new date(date.utc(2007, 0, 10, 11, 0, 0)); // > 'wed...
...ew date(date.utc(2007, 0, 10, 10, 0, 0)); let date2 = new date(date.utc(2007, 0, 10, 11, 0, 0)); // > 'wed, 10 jan 2007 10:00:00 gmt' // > 'wed, 10 jan 2007 11:00:00 gmt' let fmt = new intl.datetimeformat("en", { hour: 'numeric', minute: 'numeric' }); console.log(fmt.formatrange(date1, date2)); // > '10:00 – 11:00 am' fmt.formatrangetoparts(date1, date2); // return value: // [ // { type: 'hour', value: '10', source: "startrange" }, // { type: 'literal', value: ':', source: "startrange" }, // { type: 'minute', value: '00', source: "startrange" }, // { type: 'literal', value: ' – ', source: "shared" }, // { type: 'hour', value: '11', source: "endrange" }, // { type: 'literal', value: ':', source: "endrange" }, // { type: 'minute', ...
... ...
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Intl​.List​Format​.prototype​.formatToParts() - JavaScript
the intl.listformat.prototype.formattoparts() method returns an array of objects representing the different components that can be used to format a list of values in a locale-aware fashion. syntax intl.listformat.prototype.formattoparts(list) parameters list an array of values to be formatted according to a locale. return value an array of components which contains the formatted parts from the list. description whereas intl.listformat.prototype.format() returns a string being the formated version of the list (according to the given locale and style options), formattoparts() returns an array of the different components of the formated string. each element of the resulting array has two properties: type and value. ...
...the value property gives the content, as a string, of the token. ...
...to a value from the list, or "literal" which refers to a linguistic construct. the value property gives the content, as a string, of the token. the locale and style options used for formatting are given when constructing the intl.listformat instance. ...
... property gives the content, as a string, of the token. the locale and style options used for formatting are given when constructing the intl.listformat instance. examples using formattoparts const fruits = ['apple', 'orange', 'pineapple']; const mylistformat = new intl.listformat('en-gb', { style: 'long', type: 'conjunction' }); console.table(mylistformat.formattoparts(fruits)); // [ // { "type": "element", "value": "apple" }, // { "type": "literal", "value": ", " }, // { "type": "element", "value": "orange" }, // { "type": "literal", "value": ", and " }, // { "type": "element", "value": "pineapple" } // ] specifications specification intl.listformatthe definition of 'formattoparts()' in that specification. ...

Promise.prototype.then() - JavaScript
xecution of a function to the moment the stack is empty settimeout(() => { console.log(thenprom); }); // logs, in order: // promise {[[promisestatus]]: "pending", [[promisevalue]]: undefined} // "this gets called after the end of the main stack. the value received and returned is: 33" // promise {[[promisestatus]]: "resolved", [[promisevalue]]: 33} description as the then and promise.prototype.catch() methods return promises, they can be chained — an operation called composition. examples using the then method var p1 = new promise((resolve, reject) => { resolve('success!'); // or // reject(new error("error!")); }); p1.then(value => { console.log(value); // success! }, reason => { console.error(reason); // error! }); chaining the then method returns a promise which al...
...e chaining to implement one function with a promise-based api on top of another such function. function fetch_current_data() { // the fetch() api returns a promise. this function // exposes a similar api, except the fulfillment // value of this function's promise has had more // work done on it. return fetch('current-data.json').then(response => { if (response.headers.get('content-type') != 'application/json') { throw new typeerror(); } var j = response.json(); // maybe do something with j return j; // fulfillment value given to user of // fetch_current_data().then() }); } if onfulfilled returns a promise, the return value of then will be resolved/rejected by the promise. function resolvelater(resolve, reject) { settimeout(function() {...
... const nexttick = (() => { const noop = () => {}; // literally const nexttickpromise = () => promise.resolve().then(noop); const rfab = reflect.apply.bind; // (thisarg, fn, thisarg, [...args]) const nexttick = (fn, ...args) => ( fn !== undefined ? promise.resolve(args).
... ...

Reflect.setPrototypeOf() - JavaScript
the static reflect.setprototypeof() method is the same method as object.setprototypeof(), except for its return type. it sets the prototype (i.e., the internal [[prototype]] property) of a specified object to another object or to null, and returns true if the operation was successful, or false otherwise. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax reflect.setprototypeof(target, prototype) parameters target the target object of which to set the prototype. prototype the object's new prototype (an object or null). ...
...ory. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax reflect.setprototypeof(target, prototype) parameters target the target object of which to set the prototype. prototype the object's new prototype (an object or null). return value a boolean indicating whether or not the prototype was successfully set. exceptions a typeerror, if target is not an object or if prototype is neither an object nor null. description the reflect.setprototypeof method changes the prototype (i.e. ...
...rget object of which to set the prototype. prototype the object's new prototype (an object or null). return value a boolean indicating whether or not the prototype was successfully set. exceptions a typeerror, if target is not an object or if prototype is neither an object nor null. description the reflect.setprototypeof method changes the prototype (i.e. the value of the internal [[prototype]] property) of the specified object. examples using reflect.setprototypeof() reflect.setprototypeof({}, object.prototype) // true // it can change an object's [[prototype]] to null. reflect.setprototypeof({}, null) // true // returns false if target is not extensible. reflect.setprototypeof(object.freeze({}), null) // false // returns false if it cause a prototype chain cycle. let target...
...eflect.setprototypeof() reflect.setprototypeof({}, object.prototype) // true // it can change an object's [[prototype]] to null. reflect.setprototypeof({}, null) // true // returns false if target is not extensible. reflect.setprototypeof(object.freeze({}), null) // false // returns false if it cause a prototype chain cycle. let target = {} let proto = object.create(target) reflect.setprototypeof(target, proto) // false specifications specification ecmascript (ecma-262)the definition of 'reflect.setprototypeof' in that specification. ...

RegExp.prototype[@@replace]() - JavaScript
ct, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax regexp[symbol.replace](str, newsubstr|function) parameters str a string that is a target of the replacement. newsubstr (replacement) the string that replaces the substring. ...
...r (replacement) the string that replaces the substring. a number of special replacement patterns are supported; see the specifying a string as a parameter section in string.prototype.replace() page. function (replacement) a function to be invoked to create the new substring. the arguments supplied to this function are described in the specifying a function as a parameter section in string.prototype.replace() page. return value a new string with some or all matches of a pattern replaced by a replacement. description this method is called internally in string.prototype.replace() if the pattern argument is a regexp object. for example, following two examples return same result. 'abc'.replace(/a/, 'a'); /a/[symbol.replace]('abc', 'a'); this method exists for customizing replace behavio...
...tern replaced by a replacement. description this method is called internally in string.prototype.replace() if the pattern argument is a regexp object. for example, following two examples return same result. 'abc'.replace(/a/, 'a'); /a/[symbol.replace]('abc', 'a'); this method exists for customizing replace behavior in regexp subclass. if pattern argument is not a regexp object, string.prototype.replace() doesn't call this method, nor creates a regexp object. examples direct call this method can be used in almost the same way as string.prototype.replace(), except the different this and the different arguments order. var re = /-/g; var str = '2016-01-01'; var newstr = re[symbol.replace](str, '.'); console.log(newstr); // 2016.01.01 using @@replace in subclasses subclasses of regex...
...ubclasses subclasses of regexp can override the [@@replace]() method to modify the default behavior. class myregexp extends regexp { constructor(pattern, flags, count) { super(pattern, flags); this.count = count; } [symbol.replace](str, replacement) { // perform @@replace |count| times. var result = str; for (var i = 0; i < this.count; i++) { result = regexp.prototype[symbol.replace].call(this, result, replacement); } return result; } } var re = new myregexp('\\d', '', 3); var str = '01234567'; var newstr = str.replace(re, '#'); // string.prototype.replace calls re[@@replace]. console.log(newstr); // ###34567 specifications specification ecmascript (ecma-262)the definition of 'regexp.prototype[@@replace]' in that specification. ...

RegExp.prototype[@@split]() - JavaScript
onal integer specifying a limit on the number of splits to be found. the [@@split]() method still splits on every match of this regexp pattern (or, in the syntax above, regexp), until the number of split items match the limit or the string falls short of this pattern. return value an array containing substrings as its elements. ...
... let re = /-/g; let str = '2016-01-02'; let result = re[symbol.split](str); console.log(result); // ["2016", "01", "02"] using @@split in subclasses subclasses of regexp can override the [@@split]() method to modify the default behavior. ...
... except the different this and the different order of arguments. let re = /-/g; let str = '2016-01-02'; let result = re[symbol.split](str); console.log(result); // ["2016", "01", "02"] using @@split in subclasses subclasses of regexp can override the [@@split]() method to modify the default behavior. ...
... using @@split in subclasses subclasses of regexp can override the [@@split]() method to modify the default behavior. class myregexp extends regexp { [symbol.split](str, limit) { let result = regexp.prototype[symbol.split].call(this, str, limit); return result.map(x => "(" + x + ")"); } } let re = new myregexp('-'); let str = '2016-01-02'; let result = str.split(re); // string.prototype.split calls re[@@split]. console.log(result); // ["(2016)", "(01)", "(02)"] specifications specification ecmascript (ecma-262)the definition of 'regexp.prototype[@@split]' in that specification. ...

String.prototype.codePointAt() - JavaScript
rns undefined. description if there is no element at the specified position, undefined is returned. if no utf-16 surrogate pair begins at pos, the code unit at pos is returned. polyfill the following extends strings to include the codepointat() function as specified in ecmascript 2015 for browsers without native support. ...
...number(position) : 0; if (index != index) { // better `isnan` index = 0; } // account for out-of-bounds indices: if (index < 0 || index >= size) { return undefined; } // get the first code unit var first = stri...
... next code unit ) { second = string.charcodeat(index + 1); if (second >= 0xdc00 && second <= 0xdfff) { // low surrogate // https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae return (first - 0xd800) * 0x400 + second - 0xdc00 + 0x10000; } } return first; }; if (defineproperty) { defineproperty(string.prototype, 'codepointat', { 'value': codepointat, 'configurable': true, 'writable': true }); } else { string.prototype.codepointat = codepointat; } }()); } examples using codepointat() 'abc'.codepointat(1) // 66 '\ud800\udc00'.codepointat(0) // 65536 'xyz'.codepointat(42) // undefined looping with codepointat() for (let codepoint of ...
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String.prototype.endsWith() - JavaScript
return value true if the given characters are found at the end of the string; otherwise, false. description this method lets you determine whether or not a string ends with another string. this method is case-sensitive. polyfill this method has been added to the ecmascript 6 specification and may not be available in all javascript implementations yet. ...
...end of the string; otherwise, false. description this method lets you determine whether or not a string ends with another string. this method is case-sensitive. polyfill this method has been added to the ecmascript 6 specification and may not be available in all javascript implementations yet. ...
...false. description this method lets you determine whether or not a string ends with another string. this method is case-sensitive. polyfill this method has been added to the ecmascript 6 specification and may not be available in all javascript implementations yet. ...
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String.prototype.includes() - JavaScript
string includes another string. case-sensitivity the includes() method is case sensitive. for example, the following expression returns false: 'blue whale'.includes('blue') // returns false polyfill this method has been added to the ecmascript 2015 specification and may not be available in all javascript implementations yet. ...
.... case-sensitivity the includes() method is case sensitive. for example, the following expression returns false: 'blue whale'.includes('blue') // returns false polyfill this method has been added to the ecmascript 2015 specification and may not be available in all javascript implementations yet. ...
...alse: 'blue whale'.includes('blue') // returns false polyfill this method has been added to the ecmascript 2015 specification and may not be available in all javascript implementations yet. ...
... ...

String.prototype.match() - JavaScript
xpression does not include the g flag, str.match() will return the same result as regexp.exec(). other methods if you need to know if a string matches a regular expression regexp, use regexp.test(). if you only want the first match found, you might want to use regexp.exec() instead. if you want to obtain capture groups and the global flag is set, you need to use regexp.exec() or string.prototype.matchall() instead. examples using match() in the following example, match() is used to find 'chapter' followed by 1 or more numeric characters followed by a decimal point and numeric character 0 or more times. the regular expression includes the i flag so that upper/lower case differences will be ignored. const str = 'for more information, see chapter 3.4.5.1'; const re = /see (chapter \d+...
...tes the use of the global and ignore case flags with match(). all letters a through e and a through e are returned, each its own element in the array. const str = 'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz'; const regexp = /[a-e]/gi; const matches_array = str.match(regexp); console.log(matches_array); // ['a', 'b', 'c', 'd', 'e', 'a', 'b', 'c', 'd', 'e'] note: see also string.prototype.matchall() and advanced searching with flags. using named capturing groups in browsers which support named capturing groups, the following code captures "fox" or "cat" into a group named "animal": const paragraph = 'the quick brown fox jumps over the lazy dog. it barked.'; const capturingregex = /(?<animal>fox|cat) jumps over/; const found = paragraph.match(capturingregex); console.log(found...
...mber with a positive sign, regexp() will ignore the positive sign. const str1 = "nan means not a number. infinity contains -infinity and +infinity in javascript.", str2 = "my grandfather is 65 years old and my grandmother is 63 years old.", str3 = "the contract was declared null and void."; str1.match("number"); // "number" is a string. returns ["number"] str1.match(nan); // the type of nan is the number. returns ["nan"] str1.match(infinity); // the type of infinity is the number. returns ["infinity"] str1.match(+infinity); // returns ["infinity"] str1.match(-infinity); // returns ["-infinity"] str2.match(65); // returns ["65"] str2.match(+65); // a number with a positive sign. returns ["65"] str3.match(null); // returns ["null"] specifications ...
...ty is the number. returns ["infinity"] str1.match(+infinity); // returns ["infinity"] str1.match(-infinity); // returns ["-infinity"] str2.match(65); // returns ["65"] str2.match(+65); // a number with a positive sign. returns ["65"] str3.match(null); // returns ["null"] specifications specification ecmascript (ecma-262)the definition of 'string.prototype.match' in that specification. ...

String.prototype.matchAll() - JavaScript
tory. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax str.matchall(regexp) parameters regexp a regular expression object. if a non-regexp object obj is passed, it is implicitly converted to a regexp by using new regexp(obj). the regexp object must have the /g flag, otherwise a typeerror will be thrown. return value an iterator (which is not a restartable iterable). examples regexp.exec() and matchall() prior to the addition of matchall to javascript, it was possible to use calls to regexp.exec (and regexes with the /g flag) in a loop to obtain all the matches: const regexp = regexp('foo[a-z]*','g'); const str = 'table football, foosball'; let match; while ((match ...
...art=6 end=14." // expected output: "found foosball start=16 end=24." // matches iterator is exhausted after the for..of iteration // call matchall again to create a new iterator array.from(str.matchall(regexp), m => m[0]); // array [ "football", "foosball" ] matchall will throw an exception if the g flag is missing. ...
... 'abc'; str.matchall(regexp); // typeerror matchall internally makes a clone of the regexp—so, unlike regexp.exec(), lastindex does not change as the string is scanned. const regexp = regexp('[a-c]','g'); regexp.lastindex = 1; const str = 'abc'; array.from(str.matchall(regexp), m => `${regexp.lastindex} ${m[0]}`); // array [ "1 b", "1 c" ] better access to capturing groups (than string.prototype.match()) another compelling reason for matchall is the improved access to capture groups. capture groups are ignored when using match() with the global /g flag: let regexp = /t(e)(st(\d?))/g; let str = 'test1test2'; str.match(regexp); // array ['test1', 'test2'] using matchall, you can access capture groups easily: let array = [...str.matchall(regexp)]; array[0]; // ['test1', 'e', 'st1', '...
... ...

WebAssembly.Table.prototype.set() - JavaScript
examples using table.set the following example (see table2.html source code and live version) creates a new webassembly table instance with an initial size of 2 references. ...
...stored at a given index to a different value. syntax table.set(index, value); parameters index the index of the function reference you want to mutate. value the value you want to mutate the reference to. this must be an exported webassembly function, a javascript wrapper for an underlying wasm function. return value void. ...
...dex the index of the function reference you want to mutate. value the value you want to mutate the reference to. this must be an exported webassembly function, a javascript wrapper for an underlying wasm function. return value void. exceptions if index is greater than or equal to table.prototype.length, a rangeerror is thrown. if value is not an exported webassembly function or null, a typeerror is thrown. ...
...table.prototype.length, a rangeerror is thrown. if value is not an exported webassembly function or null, a typeerror is thrown. examples using table.set the following example (see table2.html source code and live version) creates a new webassembly table instance with an initial size of 2 references. we then print out the table length and contents of the two indexes (retrieved via table.prototype.get()) to show that the length is two, and the indexes currently contain no function references (they currently return null). var tbl = new webassembly.table({initial:2, element:"anyfunc"}); console.log(tbl.length); console.log(tbl.get(0)); console.log(tbl.get(1)); we then create an import object that contains a reference to the table: var importobj = { js: { tbl:tbl } }; finally, we ...

Types of attacks - Web security
click-jacking click-jacking is the practice of tricking a user into clicking on a link, button, etc. that is other than what the user thinks it is. this can be used, for example, to steal login credentials or to get the user's unwitting permission to install a piece of malware. (click-jacking is sometimes called "user interface redressing", though this is a misuse of the term "redress".) cross-site request forgery (csrf) cross-site scripting (xss) cross-site scripting (xss) is a security exploit which allows an attacker to inject into a website malicious client-side code. ...
...our bank account and your cookies are still valid (and there is no other validation), you will transfer money as soon as you load the html that contains this image. ...
...and there is no other validation), you will transfer money as soon as you load the html that contains this image. ...
...oney as soon as you load the html that contains this image. ...

browser.type - Archive of obsolete content
« xul reference home type type: one of the values below. the type of browser, which can be used to set access of the document loaded inside the browser. if this is not set, the loaded document has the same access as the window containing the browser. more precisely: the document loaded into a chrome window is always of chrome type. subdocuments of chrome documents are of chrome type, unless the container element (one of iframe, browser or editor) has one of the special type attribute values (the common ones are content, content-targetable and content-primary) indicating that the subdocument is of content type. this boundary has a number of special effects, such as making window.top == window (unless the browser is added to a chrome document), and preventing documents from inherit...
... content a browser for content. the content that is loaded inside the browser is not allowed to access the chrome above it. ...
... content a browser for content. the content that is loaded inside the browser is not allowed to access the chrome above it. content-primary the primary browser for content. the content that is loaded inside the browser is not allowed to access the chrome above it. ...

dlgtype - Archive of obsolete content
cancel the cancel button which will cancel the operation. help a help button for displaying help about the dialog. ...
... cancel the cancel button which will cancel the operation. help a help button for displaying help about the dialog. ...
... cancel the cancel button which will cancel the operation. help a help button for displaying help about the dialog. ...

parsetype - Archive of obsolete content
...
... ...
... ...

treecol.type - Archive of obsolete content
you need to apply css to make the checkbox toggle. here is an example css style using the current theme's checkboxes: treechildren::-moz-tree-checkbox { /* unchecked checkbox treecells. this style must come before treechildren::-moz-tree-checkbox(checked) otherwise it won't take effect. ...
...you need to apply css to make the checkbox toggle. here is an example css style using the current theme's checkboxes: treechildren::-moz-tree-checkbox { /* unchecked checkbox treecells. this style must come before treechildren::-moz-tree-checkbox(checked) otherwise it won't take effect. ...
... list-style-image: url("chrome://global/skin/checkbox/cbox-check.gif"); } treechildren::-moz-tree-checkbox(disabled) { /* disabled checkbox treecells. cbox-check.gif isn't available in firefox 1, 2, and 3 in mac os x, so you should specify a url to an image in your extension or elsewhere. */ list-style-image: url("chrome://global/skin/checkbox/cbox-check-dis.gif"); } see also type ...

selType - Archive of obsolete content
...
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Typesetting a community school homepage - Learn web development
— a serif site-wide font for the general text body, coupled with sans-serif or slab serif for the headings might be nice. use a suitable service to generate bulletproof @font-face code for these two fonts. apply your body font to the whole page, and your heading font to your headings. general text styling: give the page a site-wide font-size of 10px. give your headings and other element types appropriate font-sizes defined using a suitable relative unit. give your body text a suitable line-height. center your top level heading on the page. give your headings a little bit of letter-spacing to make them not too too squashed, and allow the letters to breathe a bit. give your body text some letter-spacing and word-spacing, as appropriate. give the first paragraph after each heading ...
...hed design could look like: assessment or further help if you would like your work assessed, or are stuck and want to ask for help: put your work into an online shareable editor such as codepen, jsfiddle, or glitch. write a post asking for assessment and/or help at the mdn discourse forum learning category. your post should include: a descriptive title such as "assessment wanted for typesetting a community school homepage". details of what you have already tried, and what you would like us to do, e.g. if you are stuck and need help, or want an assessment. a link to the example you want assessed or need help with, in an online shareable editor (as mentioned in step 1 above). this is a good practice to get into — it's very hard to help someone with a coding problem if you c...
...e editor (as mentioned in step 1 above). ...

JS::GetFirstArgumentAsTypeHint
convert first argument of @@toprimitive method to jstype. syntax bool js::getfirstargumentastypehint(jscontext* cx, callargs args, jstype *result); name type description cx jscontext * the context in which to define functions. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. fs callargs the arguments of the function call. behavior jstype * receives the result of conversion. see below. description js::getfirstargumentastypehint converts first argument of @@toprimitive method to jstype. if args.get(0) is one of the strings "string", "number", or "default", set *result to jstype_string, jstype_number, or jstype_void accordingly and return true. otherwise, return false with a...
...e function call. behavior jstype * receives the result of conversion. see below. description js::getfirstargumentastypehint converts first argument of @@toprimitive method to jstype. if args.get(0) is one of the strings "string", "number", or "default", set *result to jstype_string, jstype_number, or jstype_void accordingly and return true. otherwise, return false with a typeerror pending. ...
... conversion. see below. description js::getfirstargumentastypehint converts first argument of @@toprimitive method to jstype. if args.get(0) is one of the strings "string", "number", or "default", set *result to jstype_string, jstype_number, or jstype_void accordingly and return true. otherwise, return false with a typeerror pending. ...

JS_GetErrorPrototype
this article covers features introduced in spidermonkey 38 return the original value of error.prototype. syntax jsobject * js_geterrorprototype(jscontext *cx); name type description cx jscontext * pointer to a js context whose errors should be reported via your function. other contexts in the same runtime can have their own error reporting functions. ...
...s introduced in spidermonkey 38 return the original value of error.prototype. syntax jsobject * js_geterrorprototype(jscontext *cx); name type description cx jscontext * pointer to a js context whose errors should be reported via your function. other contexts in the same runtime can have their own error reporting functions. description js_geterrorprototype returns the original value of error.prototype from the global object of the current compartment of cx. ...
... type description cx jscontext * pointer to a js context whose errors should be reported via your function. other contexts in the same runtime can have their own error reporting functions. description js_geterrorprototype returns the original value of error.prototype from the global object of the current compartment of cx. ...

JS_TypeOfValue
determines the js data type of a js value. syntax jstype js_typeofvalue(jscontext *cx, js::handle<js::value> v); name type description cx jscontext * the context in which to perform the type check. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. v js::handle&lt;js::value&gt; the value to examine. description js_typeofvalue examines a specified js value, v, and returns its js data type. the return value is always one of jstype_void, jstype_object, jstype_function, jstype_string, jstype_number, or jstype_boolean. ...
...in a js_threadsafe build, the caller must be in a request on this jscontext. v js::handle&lt;js::value&gt; the value to examine. description js_typeofvalue examines a specified js value, v, and returns its js data type. the return value is always one of jstype_void, jstype_object, jstype_function, jstype_string, jstype_number, or jstype_boolean. ...
...er must be in a request on this jscontext. v js::handle&lt;js::value&gt; the value to examine. description js_typeofvalue examines a specified js value, v, and returns its js data type. the return value is always one of jstype_void, jstype_object, jstype_function, jstype_string, jstype_number, or jstype_boolean. ...

nsIAccessibleScrollType
accessible/public/nsiaccessibletypes.idlscriptable these constants control the scrolling of an object or substring into a window. 1.0 66 introduced gecko 1.9 inherits from: nsisupports last changed in gecko 1.9 (firefox 3) constants constant value description scroll_type_top_left 0x00 scroll the top left of the object or substring to the top left of the window (or as close as possible). scroll_type_bottom_right 0x01 scroll the bottom right of the object or substring to the bottom right of the window (or as close as possible). scroll_type_top_edge 0x02 scroll the top edge of the object or substring to the top edge of the window (or as close as possible). ...
..._left 0x00 scroll the top left of the object or substring to the top left of the window (or as close as possible). scroll_type_bottom_right 0x01 scroll the bottom right of the object or substring to the bottom right of the window (or as close as possible). scroll_type_top_edge 0x02 scroll the top edge of the object or substring to the top edge of the window (or as close as possible). scroll_type_bottom_edge 0x03 scroll the bottom edge of the object or substring to the bottom edge of the window (or as close as possible). scroll_type_left_edge 0x04 scroll the left edge of the object or substring to the left edge of the window (or as close as possible). ...
..._edge 0x02 scroll the top edge of the object or substring to the top edge of the window (or as close as possible). scroll_type_bottom_edge 0x03 scroll the bottom edge of the object or substring to the bottom edge of the window (or as close as possible). scroll_type_left_edge 0x04 scroll the left edge of the object or substring to the left edge of the window (or as close as possible). scroll_type_right_edge 0x05 scroll the right edge of the object or substring to the right edge of the window (or as close as possible). scroll_type_anywhere 0x06 scroll an object the minimum amount necessary in order for the entire frame to be visible (if possible). ...

ctypes.open
at the heart of js-ctypes is the ctypes.open() function. this must be called before any work can commence. there are two options: custom native file (dll, so, dylib, etc.) standard os libraries custom native file for this method, a native file must be created. a native file for use on unix systems is an so file, which is created and a c function called add() is written. int add(int a, int b) { return a + b; } to make this a shared library, a native file which can be loaded and used from js-ctypes, compile it with these commands: gcc -fpic -c mycfuntionsforunix.c gcc -shared -o mycfuntionsforunix.so mycfuntionsforunix.o a file named mycfuntionsforunix.so is successfully created. this native file can be placed in any folder of an addon and then loaded from js-ctypes. they can als...
...ddon-data-folder it is important to note that custom native files cannot be loaded through chrome:// or resource:// uris. they must be accessed through a local file path (file://) or a jar path (jar:). if the addon is an unpacked addon, such as bootstrap or add-on sdk addons, the jar path must be used. therefore, the path has to be converted and then the converted path is used for loading with ctypes.open. if the native file is located at chrome://youraddon/content/mysubfolder/mycfunctionsforunix.so then it is converted to a file uri like this: components.utils.import("resource://gre/modules/services.jsm"); var cr = components.classes['@mozilla.org/chrome/chrome-registry;1'].getservice(components.interfaces.nsichromeregistry); var chromeuri_mylib = services.io.newuri('chrome://youraddon/c...
...stall.rdf this will look like: "c:\users\vayeate\appdata\roaming\mozilla\firefox\profiles\aksozfjt.unnamed profile 10\extensions\asynczip@jetpack" var filepath_mylib = os.path.join(filepath_folder, 'mysubfolder', 'mycfunctionsforunix.so'); var jarpath_mylib = jarpath_folder + 'mysubfolder/mycfunctionsforunix.so'; } this can then be opened and the c functions within can be used from js-ctypes. var lib = ctypes.open(filepath_mylib); var add_with_c = lib.declare("add", ctypes.default_abi, ctypes.int, // return type ctypes.int, // a ctypes.int // b ); var rez = add_with_c(2, 5); // rez is 7 lib.close(); references heather's paragraphs: playing around with js-ctypes on linux - credits for basis of this article github :: diegocr - fx-sapi-test - creating a ...

BasicCardRequest.supportedTypes - Web APIs
the obsolete supportedtypes property of the basiccardrequest dictionary can optionally be provided to specify an array of domstrings representing the card types that the retailer supports (e.g. credit, debit, prepaid). this property is obsolete and should no longer be used. instead of making the web app or site worry about this, the onus has been transferred to the payment processor. syntax basiccardrequest.supportedtypes = [cardtype1...cardtypen]; value an array containing one or more domstrings, which describe the card types the retailer supports. ...
...it, debit, prepaid). this property is obsolete and should no longer be used. instead of making the web app or site worry about this, the onus has been transferred to the payment processor. syntax basiccardrequest.supportedtypes = [cardtype1...cardtypen]; value an array containing one or more domstrings, which describe the card types the retailer supports. legal values are defined in basiccardtype enum, and are currently: credit debit prepaid example the following example shows a sample definition of the first parameter of the paymentrequest() constructor, the data property of which contains supportednetworks and supportedtypes properties. var supportedinstruments = [{ supportedmethods: 'basic-card', data: { supportednetworks: ['visa', 'mastercard', 'amex', 'jcb', ...
...owing example shows a sample definition of the first parameter of the paymentrequest() constructor, the data property of which contains supportednetworks and supportedtypes properties. var supportedinstruments = [{ supportedmethods: 'basic-card', data: { supportednetworks: ['visa', 'mastercard', 'amex', 'jcb', 'diners', 'discover', 'mir', 'unionpay'], supportedtypes: ['credit', 'debit'] } }]; var details = { ... }; var options = { ... }; var request = new paymentrequest(supportedinstruments, details, options); ...

Credential.type - Web APIs
example // tbd specifications specification status comment credential management level 1 working draft initial definition. ...
... example // tbd specifications specification status comment credential management level 1 working draft initial definition. ...
... example // tbd specifications specification status comment credential management level 1 working draft initial definition. ...

DOMImplementation.createDocumentType() - Web APIs
the domimplementation.createdocumenttype() method returns a documenttype object which can either be used with domimplementation.createdocument upon document creation or can be put into the document via methods like node.insertbefore() or node.replacechild(). syntax var doctype = document.implementation.createdocumenttype(qualifiednamestr, publicid, systemid); parameters qualifiednamestr is a domstring containing the qualified name, like svg:svg. publicid is a domstring containing the public identifier. systemid is a domstring containing the system identifiers. ...
....replacechild(). syntax var doctype = document.implementation.createdocumenttype(qualifiednamestr, publicid, systemid); parameters qualifiednamestr is a domstring containing the qualified name, like svg:svg. publicid is a domstring containing the public identifier. systemid is a domstring containing the system identifiers. example var dt = document.implementation.createdocumenttype('svg:svg', '-//w3c//dtd svg 1.1//en', 'http://www.w3.org/graphics/svg/1.1/dtd/svg11.dtd'); var d = document.implementation.createdocument('http://www.w3.org/2000/svg', 'svg:svg', dt); alert(d.doctype.publicid); // -//w3c//dtd svg 1.1//en specifications specification status comment domthe definition of 'domimplementation.createdocumenttype' in that specification. livi...
...e.publicid); // -//w3c//dtd svg 1.1//en specifications specification status comment domthe definition of 'domimplementation.createdocumenttype' in that specification. living standard no change from document object model (dom) level 3 core specification document object model (dom) level 3 core specificationthe definition of 'domimplementation.createdocumenttype' in that specification. obsolete no change from document object model (dom) level 2 core specification document object model (dom) level 2 core specificationthe definition of 'domimplementation.createdocumenttype' in that specification. obsolete initial definition. ...

DataTransferItem.type - Web APIs
the read-only datatransferitem.type property returns the type (format) of the datatransferitem object representing the drag data item. the type is a unicode string generally given by a mime type, although a mime type is not required. some example types are: text/plain and text/html. syntax dataitem.type; return value a domstring representing the drag data item's type. example this example shows the use of the type property. ...
...xample types are: text/plain and text/html. syntax dataitem.type; return value a domstring representing the drag data item's type. example this example shows the use of the type property. function drop_handler(ev) { console.log("drop"); ev.preventdefault(); var data = ev.datatransfer.items; for (var i = 0; i < data.length; i += 1) { if ((data[i].kind == 'string') && (data[i].type.match('^text/plain'))) { // this item is the target node data[i].getasstring(function (s){ ev.target.appendchild(document.getelementbyid(s)); }); } else if ((data[i].kind == 'string') && (data[i].type.match('^text/html'))) { // drag data item is html console.log("... drop: html"); } else if ((data[i].kind == 'string') && (data[i].t...
... }); } else if ((data[i].kind == 'string') && (data[i].type.match('^text/html'))) { // drag data item is html console.log("... drop: html"); } else if ((data[i].kind == 'string') && (data[i].type.match('^text/uri-list'))) { // drag data item is uri console.log("... drop: uri"); } else if ((data[i].kind == 'file') && (data[i].type.match('^image/'))) { // drag data item is an image file var f = data[i].getasfile(); console.log("... drop: file "); } } } specifications specification status comment html living standardthe definition of 'type' in that specification. living standard initial version html 5.1the definition of 'type' in that specification. recommendati...

msAudioDeviceType - Web APIs
non-standard this feature is non-standard and is not on a standards track. do not use it on production sites facing the web: it will not work for every user. there may also be large incompatibilities between implementations and the behavior may change in the future. the msaudiodevicetype property of the html <audio> element, is a read/write proprietary attribute, specific to internet explorer and microsoft edge. msaudiodevicetype specifies the output device id that the audio will be sent to. syntax <audio src="sound.mp3" msaudiodevicetype="communications" /> by default, audio on your system will output to your default speakers and be considered a foreground element, meaning that the audio will play only when the element is active in the app. for real-time ...
... value description console specifies that the audio output will be sent to the console device. ...
... value description console specifies that the audio output will be sent to the console device. ...

HTMLMediaElement.canPlayType() - Web APIs
the htmlmediaelement method canplaytype() reports how likely it is that the current browser will be able to play media of a given mime type. note: this feature is not available in web workers. syntax canplayresponse = audioorvideo.canplaytype(mediatype); parameters mediatype a domstring containing the mime type of the media. return value a domstring indicating how likely it is that the media can be played. the string will be one of the following values: probably media of the type indicated by the mediatype parameter is probably playable on this device. maybe not enough information is available to determine for sure whether or not the media will play until playback is actually attempted. ...
... domstring indicating how likely it is that the media can be played. the string will be one of the following values: probably media of the type indicated by the mediatype parameter is probably playable on this device. maybe not enough information is available to determine for sure whether or not the media will play until playback is actually attempted. "" (empty string) media of the given type definitely can't be played on the current device. ...
...dia of the type indicated by the mediatype parameter is probably playable on this device. maybe not enough information is available to determine for sure whether or not the media will play until playback is actually attempted. "" (empty string) media of the given type definitely can't be played on the current device. example var obj = document.createelement('video'); console.log(obj.canplaytype('video/mp4')); // "maybe" specifications specification status comment html living standardthe definition of 'canplaytype' in that specification. living standard html5the definition of 'htmlmediaelement.canplaytype' in that specification. recommendation initial definition. ...

MediaRecorder.isTypeSupported - Web APIs
the mediarecorder.istypesupported() static method returns a boolean which is true if the mime type specified is one the user agent should be able to successfully record. syntax var canrecord = mediarecorder.istypesupported(mimetype) parameters mimetype the mime media type to check. return value true if the mediarecorder implementation is capable of recording blob objects for the specified mime type. recording may still fail if there are insufficient resources to support the recording and encoding process. if the value is false, the user agent is incapable of recording the specified format. ...
...ted(mimetype) parameters mimetype the mime media type to check. return value true if the mediarecorder implementation is capable of recording blob objects for the specified mime type. recording may still fail if there are insufficient resources to support the recording and encoding process. if the value is false, the user agent is incapable of recording the specified format. ...
...to support the recording and encoding process. if the value is false, the user agent is incapable of recording the specified format. example var types = ["video/webm", "audio/webm", "video/webm\;codecs=vp8", "video/webm\;codecs=daala", "video/webm\;codecs=h264", "audio/webm\;codecs=opus", "video/mpeg"]; for (var i in types) { console.log( "is " + types[i] + " supported? " + (mediarecorder.istypesupported(types[i]) ? "maybe!" : "nope :(")); } specifications specification status comment mediastream recordingthe definition of 'istypesupported()' in that specification. working draft initial definition. ...

Media Session action types - Web APIs
to support an action on a media session, such as seeking, pausing, or changing tracks, you need to call the mediasession interface's setactionhandler() method to establish a handler for that action. the specific type of media session action to be handled on a mediasession is identified using a string from the mediasessionaction enumerated type. syntax a media session action's type is specified using a string from the mediasessionaction enumerated type. values each of the actions is a common media session control request. implement support for each of these in order to allow that type of action to be performed. the following strings identify the currently available types of media session action: nexttrack advances playback to the next track. pause pauses playback of the media...
...ath.min(audio.currenttime + skiptime, audio.duration); }); navigator.mediasession.setactionhandler('seekbackward', evt => { // user clicked "seek backward" media notification icon. ...
... draft initial definition. ...

NavigatorPlugins.mimeTypes - Web APIs
returns a mimetypearray object, which contains a list of mimetype objects representing the mime types recognized by the browser. note: named properties of mimetypearray objects are no longer enumerable in the latest browser versions. syntax var mimetypes[] = navigator.mimetypes; mimetypes is a mimetypearray object which has a length property as well as item(index) and nameditem(name) methods. ...
...e types recognized by the browser. note: named properties of mimetypearray objects are no longer enumerable in the latest browser versions. syntax var mimetypes[] = navigator.mimetypes; mimetypes is a mimetypearray object which has a length property as well as item(index) and nameditem(name) methods. ...
...s of mimetypearray objects are no longer enumerable in the latest browser versions. syntax var mimetypes[] = navigator.mimetypes; mimetypes is a mimetypearray object which has a length property as well as item(index) and nameditem(name) methods. example function isjavapresent() { return 'application/x-java-applet' in navigator.mimetypes; } function getjavaplugindescription() { var mimetype = navigator.mimetypes['application/x-java-applet']; if (mimetype === undefined) { // no java plugin present return undefined; } return mimetype.enabledplugin.description; } specifications specification status comment html living standardthe definition of 'navigatorplugins.mimetypes' in that specification. living standard initial definition. ...

NonDocumentTypeChildNode - Web APIs
the nondocumenttypechildnode interface contains methods that are particular to node objects that can have a parent, but not suitable for documenttype. nondocumenttypechildnode is a raw interface and no object of this type can be created; it is implemented by element, and characterdata objects. properties there are no inherited properties. nondocumenttypechildnode.previouselementsibling read only returns the element immediately prior to this node in its parent's children list, or null if there is no element in the list prior to this node. nondocumenttypechildnode.nextelementsibling read only returns the element immediately following this node in its parent's children list, or null if there is no element in the list following this node. methods there are neither inherited nor spec...
...the previouselementsibling and nextelementsibling are now defined on the latter. the characterdata and element implemented the new interfaces. ...
...the previouselementsibling and nextelementsibling are now defined on the latter. ...

OscillatorNode.type - Web APIs
the type property of the oscillatornode interface specifies what shape of waveform the oscillator will output. there are several common waveforms available, as well as an option to specify a custom waveform shape. the shape of the waveform will affect the tone that is produced. syntax oscillatornode.type = type; value a domstring specifying the shape of oscillator wave. the different available values are: sine a sine wave. this is the default value. square a square wave with a duty cycle of 0.5; that is, the signal is "high" for half of each period. sawtooth a sawtooth wave. triangle a triangle wave. custom a custom waveform. you never set type to custom manually; instead, use the setperiodicwave() method to provide the data representing the waveform. doing so automatically ...
...e: sine a sine wave. this is the default value. square a square wave with a duty cycle of 0.5; that is, the signal is "high" for half of each period. sawtooth a sawtooth wave. triangle a triangle wave. custom a custom waveform. you never set type to custom manually; instead, use the setperiodicwave() method to provide the data representing the waveform. doing so automatically sets the type to custom. exceptions invalidstateerror the value custom was specified. to set a custom waveform, just call setperiodicwave(). doing so automatically sets the type for you. example the following example shows basic usage of an audiocontext to create an oscillator node. for an applied example, check out our violent theremin demo (see app.js for relevant code). // create web audio api con...
...he type for you. example the following example shows basic usage of an audiocontext to create an oscillator node. for an applied example, check out our violent theremin demo (see app.js for relevant code). // create web audio api context var audioctx = new (window.audiocontext || window.webkitaudiocontext)(); // create oscillator node var oscillator = audioctx.createoscillator(); oscillator.type = 'square'; oscillator.frequency.setvalueattime(440, audioctx.currenttime); // value in hertz oscillator.start(); specifications specification status comment web audio apithe definition of 'type' in that specification. working draft ...

PaymentRequest.shippingType - Web APIs
candidate recommendation initial definition. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. ...
... candidate recommendation initial definition. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. ...
...n. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. ...

RTCDataChannel.binaryType - Web APIs
the property binarytype on the rtcdatachannel interface is a domstring which specifies the type of javascript object which should be used to represent binary data received on the rtcdatachannel. values allowed by the websocket.binarytype property are also permitted here: "blob" if blob objects are being used or "arraybuffer" if arraybuffer objects are being used. the default is "blob". when a binary message is received on the data channel, the resulting message event's messageevent.data property is an object of the type specified by the binarytype. syntax var type = adatachannel.binarytype; adatachannel.binarytype = type; value a domstring that can have one of these values: "blob" received binary messages' contents will be contained in blob objects. "arraybuffer" received bina...
...objects. "arraybuffer" received binary messages' contents will be contained in arraybuffer objects. example this code configures a data channel to receive binary data in arraybuffer objects, and establishes a listener for message events which constructs a string representing the received data as a list of hexadecimal byte values. ...
..."binary"); dc.binarytype = "arraybuffer"; dc.onmessage = function(event) { let bytearray = new uint8array(event.data); let hexstring = ""; bytearray.foreach(function(byte) { hexstring += byte.tostring(16) + " "; }); }; specifications specification status comment webrtc 1.0: real-time communication between browsersthe definition of 'rtcdatachannel.binarytype' in that specification. candidate recommendation initial specification. ...

RTCNetworkType - Web APIs
the webrtc rtcnetworktype enumerated type defines a set of strings used to identify the type of network used by a connection between two peers. this type is used as the value or the following properties: rtcicecandidate's networktype rtcstunserverconnectionstats's networktype values bluetooth a bluetooth connection is used by the described connection. cellular the connection uses a cellular data service to connect. this includes all cellular data services including edge (2g), hspa (3g), lte (4g), and nr (5g). ethernet the described connection uses an ethernet network. wifi the described connection uses wifi. wimax the described connection uses a wimax network. vpn the connection uses a virtual private network (vpn). ...
...ion uses a cellular data service to connect. this includes all cellular data services including edge (2g), hspa (3g), lte (4g), and nr (5g). ethernet the described connection uses an ethernet network. wifi the described connection uses wifi. wimax the described connection uses a wimax network. vpn the connection uses a virtual private network (vpn). the vpn obscures the underlying network type, which is not discernible. unknown the user's browser is unable or unwilling to identify the underlying connection technology used by the described connection. this may be because the browser isn't able to determine the network type for some reason or it may be intentionally getting obscured for security reasons, such as to avoid device fingerprinting. note: keep in mind that the specified v...
...n. this may be because the browser isn't able to determine the network type for some reason or it may be intentionally getting obscured for security reasons, such as to avoid device fingerprinting. note: keep in mind that the specified value only reflects the initial connection between the local peer and the next hop along the network toward reaching the remote peer. for example, if the networktype is wifi but the user is connected using a cellular hotspot, the connection will be bottlenecked by the underlying cellular network (and any other networks between the two peers). specifications specification status comment webrtc 1.0: real-time communication between browsersthe definition of 'rtcnetworktype' in that specification. candidate recommendation initial ...

ScreenOrientation.type - Web APIs
working draft initial definition. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. ...
... working draft initial definition. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. ...
...efinition. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. ...

TaskAttributionTiming.containerType - Web APIs
working draft initial definition. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. ...
... working draft initial definition. browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. ...
.... browser compatibility the compatibility table on this page is generated from structured data. if you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. ...

XMLHttpRequest.overrideMimeType() - Web APIs
the xmlhttprequest method overridemimetype() specifies a mime type other than the one provided by the server to be used instead when interpreting the data being transferred in a request. this may be used, for example, to force a stream to be treated and parsed as "text/xml", even if the server does not report it as such. this method must be called before calling send(). syntax xmlhttprequest.overridemimetype(mimetype) parameters mimetype a domstring specifying the mime type to use instead of the one specified by the server. if the server doesn't specify a type, xmlhttprequest assumes "text/xml". return value undefined. example this example specifies a mime type of "text/plain", overriding the server's stated type for the data being received. note: if the server doesn't...
...e(mimetype) parameters mimetype a domstring specifying the mime type to use instead of the one specified by the server. if the server doesn't specify a type, xmlhttprequest assumes "text/xml". return value undefined. example this example specifies a mime type of "text/plain", overriding the server's stated type for the data being received. note: if the server doesn't provide a content-type header, xmlhttprequest assumes that the mime type is "text/xml". if the content isn't valid xml, an "xml parsing error: not well-formed" error occurs. you can avoid this by calling overridemimetype() to specify a different type. ...
... the data being received. note: if the server doesn't provide a content-type header, xmlhttprequest assumes that the mime type is "text/xml". if the content isn't valid xml, an "xml parsing error: not well-formed" error occurs. you can avoid this by calling overridemimetype() to specify a different type. // interpret the received data as plain text req = new xmlhttprequest(); req.overridemimetype("text/plain"); req.addeventlistener("load", callback, false); req.open("get", url); req.send(); specifications specification status comment xmlhttprequestthe definition of 'overridemimetype()' in that specification. living standard whatwg living standard ...

:nth-last-of-type() - CSS: Cascading Style Sheets
the :nth-last-of-type() css pseudo-class matches elements of a given type, based on their position among a group of siblings, counting from the end. /* selects every fourth <p> element among any group of siblings, counting backwards from the last one */ p:nth-last-of-type(4n) { color: lime; } note: this pseudo-class is essentially the same as :nth-of-type, except it counts items backwards from the end, not forwards from the beginning. syntax the nth-last-of-type pseudo-class is specified with a single argument, which represents the pattern for matching elements, counting from the end. see :nth-last-child for a more detailed explanation of its syntax. ...
... note: this pseudo-class is essentially the same as :nth-of-type, except it counts items backwards from the end, not forwards from the beginning. syntax the nth-last-of-type pseudo-class is specified with a single argument, which represents the pattern for matching elements, counting from the end. see :nth-last-child for a more detailed explanation of its syntax. ...
...more detailed explanation of its syntax. formal syntax :nth-last-of-type( <nth> )where <nth> = <an-plus-b> | even | odd examples html <div> <span>this is a span.</span> <span>this is another span.</span> <em>this is emphasized.</em> <span>wow, this span gets limed!!!</span> <strike>this is struck through.</strike> <span>here is one last span.</span> </div> css span:nth-last-of-type(2) { background-color: lime; } result specifications specification status comment selectors level 4the definition of ':nth-last-of-type' in that specification. working draft matching elements are not required to have a parent. selectors level 3the definition of ':nth-last-of-type' in that specification. recommendation initial definition. ...

CSS data types - CSS: Cascading Style Sheets
css data types define typical values (including keywords and units) accepted by css properties and functions. they are a special kind of component value type. in formal syntax, data types are denoted by a keyword placed between the inequality signs "<" and ">". ...
... css data types define typical values (including keywords and units) accepted by css properties and functions. they are a special kind of component value type. in formal syntax, data types are denoted by a keyword placed between the inequality signs "<" and ">". ...
... see also css units and values introduction to css: values and units ...

exsl:object-type() - EXSLT
xslt/xpath reference: xslt elements, exslt functions, xpath functions, xpath axes exsl:object-type() returns a string that indicates the type of the specified object. note: most xslt object types can be coerced into each other safely; however, certain coercsions to raise error conditions. in particular, treating something that's not a node-set as a node-set will do so. this function lets authors of named templates and extension functions easily provide flexibility in parameter values. syntax exsl:object-type(object) parameters object the object whose type is to be returned. ...
...to each other safely; however, certain coercsions to raise error conditions. in particular, treating something that's not a node-set as a node-set will do so. ...
... as a node-set will do so. this function lets authors of named templates and extension functions easily provide flexibility in parameter values. ...

CSP: trusted-types - HTTP
the http content-security-policy (csp) trusted-types directive instructs user agents to restrict usage of known dom xss sinks to a predefined set of functions that only accept non-spoofable, typed values in place of strings. this allows authors to define rules guarding writing values to the dom and thus reducing the dom xss attack surface to small, isolated parts of the web application codebase, facilitating their monitoring and code review. this directive declares a white-list of trusted type policy names created with trustedtypes.createpolicy from trusted types api. ...
...trings. this allows authors to define rules guarding writing values to the dom and thus reducing the dom xss attack surface to small, isolated parts of the web application codebase, facilitating their monitoring and code review. this directive declares a white-list of trusted type policy names created with trustedtypes.createpolicy from trusted types api. syntax content-security-policy: trusted-types; content-security-policy: trusted-types <policyname>; content-security-policy: trusted-types <policyname> <policyname> 'allow-duplicates'; <domstring> any string can be a trusted type policy name. 'allow-duplicates' allows for creating policies with a name that was already used examples todo polyfill a polyfill for trusted types is available on github. specifications speci...
...me>; content-security-policy: trusted-types <policyname> <policyname> 'allow-duplicates'; <domstring> any string can be a trusted type policy name. 'allow-duplicates' allows for creating policies with a name that was already used examples todo polyfill a polyfill for trusted types is available on github. specifications specification status comment trusted types draft initial definition. ...

415 Unsupported Media Type - HTTP
the http 415 unsupported media type client error response code indicates that the server refuses to accept the request because the payload format is in an unsupported format. the format problem might be due to the request's indicated content-type or content-encoding, or as a result of inspecting the data directly. ...
... the http 415 unsupported media type client error response code indicates that the server refuses to accept the request because the payload format is in an unsupported format. the format problem might be due to the request's indicated content-type or content-encoding, or as a result of inspecting the data directly. ...
...ode indicates that the server refuses to accept the request because the payload format is in an unsupported format. the format problem might be due to the request's indicated content-type or content-encoding, or as a result of inspecting the data directly. ...

TypeError: can't define property "x": "obj" is not extensible - JavaScript
the javascript exception "can't define property "x": "obj" is not extensible" occurs when object.preventextensions() marked an object as no longer extensible, so that it will never have properties beyond the ones it had at the time it was marked as non-extensible. message typeerror: cannot create property for a non-extensible object (edge) typeerror: can't define property "x": "obj" is not extensible (firefox) typeerror: cannot define property: "x", object is not extensible. (chrome) error type typeerror what went wrong? usually, an object is extensible and new properties can be added to it. however, in this case object.preventextensions() marked an object as no longer extensible, so that it will never have properties beyond the ones it had at the time it was marked as non-extensible. ...
...ct is extensible and new properties can be added to it. however, in this case object.preventextensions() marked an object as no longer extensible, so that it will never have properties beyond the ones it had at the time it was marked as non-extensible. examples adding new properties to a non-extensible objects in strict mode, attempting to add new properties to a non-extensible object throws a typeerror. in sloppy mode, the addition of the "x" property is silently ignored. 'use strict'; var obj = {}; object.preventextensions(obj); obj.x = 'foo'; // typeerror: can't define property "x": "obj" is not extensible in both, strict mode and sloppy mode, a call to object.defineproperty() throws when adding a new property to a non-extensible object. var obj = { }; object.preventextensions(obj)...
...ilently ignored. 'use strict'; var obj = {}; object.preventextensions(obj); obj.x = 'foo'; // typeerror: can't define property "x": "obj" is not extensible in both, strict mode and sloppy mode, a call to object.defineproperty() throws when adding a new property to a non-extensible object. var obj = { }; object.preventextensions(obj); object.defineproperty(obj, 'x', { value: "foo" } ); // typeerror: can't define property "x": "obj" is not extensible to fix this error, you will either need to remove the call to object.preventextensions() entirely, or move it to a position so that the property is added earlier and only later the object is marked as non-extensible. of course you can also remove the property that was attempted to be added, if you don't need it. 'use strict'; var obj = ...

SyntaxError: test for equality (==) mistyped as assignment (=)? - JavaScript
what went wrong? there was an assignment (=) when you would normally expect a test for equality (==). to help debugging, javascript (with strict warnings enabled) warns about this pattern. ...
... what went wrong? there was an assignment (=) when you would normally expect a test for equality (==). to help debugging, javascript (with strict warnings enabled) warns about this pattern. ...
... what went wrong? there was an assignment (=) when you would normally expect a test for equality (==). to help debugging, javascript (with strict warnings enabled) warns about this pattern. ...

TypeError: "x" is not a constructor - JavaScript
the javascript exception "is not a constructor" occurs when there was an attempt to use an object or a variable as a constructor, but that object or variable is not a constructor. message typeerror: object doesn't support this action (edge) typeerror: "x" is not a constructor typeerror: math is not a constructor typeerror: json is not a constructor typeerror: symbol is not a constructor typeerror: reflect is not a constructor typeerror: intl is not a constructor typeerror: atomics is not a constructor error type typeerror what went wrong? there was an attempt to use an object or a variable as a constructor, but that object or variable is not a constructor. see constructor or the new operator for more information on what a constructor is. there are many global objects, like string or ...
...here are many global objects, like string or array, which are constructable using new. however, some global objects are not and their properties and methods are static. the following javascript standard built-in objects are not a constructor: math, json, symbol, reflect, intl, atomics. generator functions cannot be used as constructors either. examples invalid cases var car = 1; new car(); // typeerror: car is not a constructor new math(); // typeerror: math is not a constructor new symbol(); // typeerror: symbol is not a constructor function* f() {}; var obj = new f; // typeerror: f is not a constructor a car constructor suppose you want to create an object type for cars. you want this type of object to be called car, and you want it to have properties for make, model, and year. to ...
...ake = make; this.model = model; this.year = year; } now you can create an object called mycar as follows: var mycar = new car('eagle', 'talon tsi', 1993); in promises when returning an immediately-resolved or immediately-rejected promise, you do not need to create a new promise(...) and act on it. ...

TypeError: "x" is (not) "y" - JavaScript
the javascript exception "x is (not) y" occurs when there was an unexpected type. oftentimes, unexpected undefined or null values. message typeerror: unable to get property {x} of undefined or null reference (edge) typeerror: "x" is (not) "y" (firefox) examples: typeerror: "x" is undefined typeerror: "x" is null typeerror: "undefined" is not an object typeerror: "x" is not an object or null typeerror: "x" is not a symbol error type typeerror. what went wrong? there was an unexpected type. this occurs oftentimes with undefined or null values. also, certain methods, such as object.create() or symbol.keyfor(), require a specific type, that must be provided. examples invalid cases // undefined and null cases on which the substring method won't work var foo = undefined; foo.substring(1...
...x" is not a symbol error type typeerror. what went wrong? there was an unexpected type. this occurs oftentimes with undefined or null values. also, certain methods, such as object.create() or symbol.keyfor(), require a specific type, that must be provided. examples invalid cases // undefined and null cases on which the substring method won't work var foo = undefined; foo.substring(1); // typeerror: foo is undefined var foo = null; foo.substring(1); // typeerror: foo is null // certain methods might require a specific type var foo = {} symbol.keyfor(foo); // typeerror: foo is not a symbol var foo = 'bar' object.create(foo); // typeerror: "foo" is not an object or null fixing the issue to fix null pointer to undefined values, you can use the typeof operator, for example. if (foo...
...ll // certain methods might require a specific type var foo = {} symbol.keyfor(foo); // typeerror: foo is not a symbol var foo = 'bar' object.create(foo); // typeerror: "foo" is not an object or null fixing the issue to fix null pointer to undefined values, you can use the typeof operator, for example. if (foo !== undefined) { // now we know that foo is defined, we are good to go. } if (typeof foo !== 'undefined') { // the same good idea, but don't use this implementation - it can bring problems // because of the confusion between truly undefined and undeclared variables. } ...

TypeError: variable "x" redeclares argument - JavaScript
what went wrong? the same variable name occurs as a function parameter and is then redeclared using a var assignment in a function body again. this might be a naming conflict and thus javascript warns about it. ...
... what went wrong? the same variable name occurs as a function parameter and is then redeclared using a var assignment in a function body again. this might be a naming conflict and thus javascript warns about it. ...
... what went wrong? the same variable name occurs as a function parameter and is then redeclared using a var assignment in a function body again. this might be a naming conflict and thus javascript warns about it. ...

Array.prototype[@@unscopables] - JavaScript
script standard prior to the es2015 version. these properties are excluded from with statement bindings. description the default array properties that are excluded from with bindings are: copywithin() entries() fill() find() findindex() includes() keys() values() see symbol.unscopables for how to set unscopables for your own objects. property attributes of array.prototype[@@unscopables] writable no enumerable no configurable yes examples use in with environments the following code works fine in es5 and below. however, in ecmascript 2015 and later, the array.prototype.keys() method was introduced. that means that inside with environments, "keys" would now be the method and not the v...
... enumerable no configurable yes examples use in with environments the following code works fine in es5 and below. however, in ecmascript 2015 and later, the array.prototype.keys() method was introduced. that means that inside with environments, "keys" would now be the method and not the variable. this is where now the built-in @@unscopables array.prototype[@@unscopables] symbol property comes into play and prevents that some of the array methods are being scoped into the with statement. ...
...ecmascript 2015 and later, the array.prototype.keys() method was introduced. that means that inside with environments, "keys" would now be the method and not the variable. this is where now the built-in @@unscopables array.prototype[@@unscopables] symbol property comes into play and prevents that some of the array methods are being scoped into the with statement. var keys = []; with (array.prototype) { keys.push('something'); } object.keys(array.prototype[symbol.unscopables]); // ["copywithin", "entries", "fill", "find", "findindex", // "includes", "keys", "values"] specifications specification ecmascript (ecma-262)the definition of 'array.prototype[@@unscopables]' in that specification. ...

Array.prototype.every() - JavaScript
) polyfill every was added to the ecma-262 standard in the 5th edition, and it may not be present in other implementations of the standard. you can work around this by inserting the following code at the beginning of your scripts, allowing use of every in implementations which do not natively support it. this algorithm is exactly the one specified in ecma-262, 5th edition, assuming object and typeerror have their original values, and that callbackfn.call evaluates to the original value of function.prototype.call. if (!array.prototype.every) { array.prototype.every = function(callbackfn, thisarg) { 'use strict'; var t, k; if (this == null) { throw new typeerror('this is null or not defined'); } // 1. let o be the result of calling toobject passing the this ...
...s null or not defined'); } // 1. let o be the result of calling toobject passing the this // value as the argument. var o = object(this); // 2. let lenvalue be the result of calling the get internal method // of o with the argument "length". // 3. let len be touint32(lenvalue). var len = o.length >>> 0; // 4. if iscallable(callbackfn) is false, throw a typeerror exception. if (typeof callbackfn !== 'function' && object.prototype.tostring.call(callbackfn) !== '[object function]') { throw new typeerror(); } // 5. if thisarg was supplied, let t be thisarg; else let t be undefined. if (arguments.length > 1) { t = thisarg; } // 6. let k be 0. k = 0; // 7. repeat, while k < len while (k < len) { va...
... ...

Array.prototype.fill() - JavaScript
it is treated as array.length + start. if end is negative, it is treated as array.length + end. fill is intentionally generic: it does not require that its this value be an array object. fill is a mutator method: it will change the array itself and return it, not a copy of it. if the first parameter is an object, each slot in the array will reference that object. polyfill if (!array.prototype.fill) { object.defineproperty(array.prototype, 'fill', { value: function(value) { // steps 1-2. if (this == null) { throw new typeerror('this is null or not defined'); } var o = object(this); // steps 3-5. var len = o.length >>> 0; // steps 6-7. var start = arguments[1]; var relativestart = start >> 0; // step 8. ...
.... var finalvalue = relativeend < 0 ? math.max(len + relativeend, 0) : math.min(relativeend, len); // step 12. while (k < finalvalue) { o[k] = value; k++; } // step 13. return o; } }); } if you need to support truly obsolete javascript engines that don't support object.defineproperty, it's best not to polyfill array.prototype methods at all, as you can't make them non-enumerable. examples using fill [1, 2, 3].fill(4) // [4, 4, 4] [1, 2, 3].fill(4, 1) // [1, 4, 4] [1, 2, 3].fill(4, 1, 2) // [1, 4, 3] [1, 2, 3].fill(4, 1, 1) // [1, 2, 3] [1, 2, 3].fill(4, 3, 3) // [1, 2, 3] [1, 2, 3].fill(4, -3, -2) // [4, 2, 3] [1, 2, 3].fill(4, nan, nan) // [1, 2, 3...
... ...

Array.prototype.push() - JavaScript
ay. do not use this method if the second array (morevegs in the example) is very large because the maximum number of parameters that one function can take is limited in practice. see apply() for more details. let vegetables = ['parsnip', 'potato'] let morevegs = ['celery', 'beetroot'] // merge the second array into the first one // equivalent to vegetables.push('celery', 'beetroot') array.prototype.push.apply(vegetables, morevegs) console.log(vegetables) // ['parsnip', 'potato', 'celery', 'beetroot'] using an object in an array-like fashion as mentioned above, push is intentionally generic, and we can use that to our advantage. array.prototype.push can work on an object just fine, as this example shows. note that we don't create an array to store a collection of objects. instead, we s...
...snip', 'potato', 'celery', 'beetroot'] using an object in an array-like fashion as mentioned above, push is intentionally generic, and we can use that to our advantage. array.prototype.push can work on an object just fine, as this example shows. note that we don't create an array to store a collection of objects. instead, we store the collection on the object itself and use call on array.prototype.push to trick the method into thinking we are dealing with an array—and it just works, thanks to the way javascript allows us to establish the execution context in any way we want. let obj = { length: 0, addelem: function addelem(elem) { // obj.length is automatically incremented // every time an element is added. [].push.call(this, elem) } } // let's add ...
... ...

Array.prototype.slice() - JavaScript
2}}, 2] mycar[0].color = red newcar[0].color = red the new color of my honda is purple mycar[0].color = purple newcar[0].color = purple array-like objects slice method can also be called to convert array-like objects/collections to a new array. you just bind the method to the object. the arguments inside a function is an example of an 'array-like object'. ...
...rple array-like objects slice method can also be called to convert array-like objects/collections to a new array. you just bind the method to the object. the arguments inside a function is an example of an 'array-like object'. function list() { return array.prototype.slice.call(arguments) } let list1 = list(1, 2, 3) // [1, 2, 3] binding can be done with the call() method of function.prototype and it can also be reduced using [].slice.call(arguments) instead of array.prototype.slice.call. ...
...de a function is an example of an 'array-like object'. function list() { return array.prototype.slice.call(arguments) } let list1 = list(1, 2, 3) // [1, 2, 3] binding can be done with the call() method of function.prototype and it can also be reduced using [].slice.call(arguments) instead of array.prototype.slice.call. anyway, it can be simplified using bind. let unboundslice = array.prototype.slice let slice = function.prototype.call.bind(unboundslice) function list() { return slice(arguments) } let list1 = list(1, 2, 3) // [1, 2, 3] specifications specification ecmascript (ecma-262)the definition of 'array.prototype.slice' in that specification. ...

Date.prototype.toISOString() - JavaScript
m/mdn/interactive-examples and send us a pull request. syntax dateobj.toisostring() return value a string representing the given date in the iso 8601 format according to universal time. polyfill this method was standardized in ecma-262 5th edition. ...
...ng to universal time. polyfill this method was standardized in ecma-262 5th edition. ...
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Intl.Collator.prototype.compare() - JavaScript
the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax collator.compare(string1, string2) parameters string1 string2 the strings to compare against each other. description the compare getter function returns a number indicating how string1 and string2 compare to each other according to the sort order of this collator object: a negative value if string1 comes before string2; a positive value if string1 comes after string2; 0 if they are considered equal. ...
...her according to the sort order of this collator object: a negative value if string1 comes before string2; a positive value if string1 comes after string2; 0 if they are considered equal. examples using compare for array sort use the compare getter function for sorting arrays. note that the function is bound to the collator from which it was obtained, so it can be passed directly to array.prototype.sort(). var a = ['offenbach', 'Österreich', 'odenwald']; var collator = new intl.collator('de-u-co-phonebk'); a.sort(collator.compare); console.log(a.join(', ')); // → "odenwald, Österreich, offenbach" using compare for array search use the compare getter function for finding matching strings in arrays: var a = ['congrès', 'congres', 'assemblée', 'poisson']; var collator = new intl.col...
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Intl.DisplayNames.prototype.resolvedOptions() - JavaScript
syntax displaynames.resolvedoptions() return value an object with properties reflecting the locale and formatting options computed during the construction of the given displaynames object. description the object returned by resolvedoptions() has the following properties: locale the bcp 47 language tag for the locale actually used. if any unicode extension values were requested in the input bcp 47 language tag that led to this locale, the key-value pairs that were requested and are supported for this locale are included in locale. ...
... the locale actually used. if any unicode extension values were requested in the input bcp 47 language tag that led to this locale, the key-value pairs that were requested and are supported for this locale are included in locale. style the value provided for this property in the options argument of the constructor or the default value ("long"). its value is either "long", "short", or "narrow". type the value provided for this property in the options argument of the constructor or the default value ("language"). its value is either "language", "region", "script", or "currency". fallback the value provided for this property in the options argument of the constructor or the default value ("code"). its value is either "code" or "none". examples using resolvedoptions const displaynames = ...
...erty in the options argument of the constructor or the default value ("language"). its value is either "language", "region", "script", or "currency". fallback the value provided for this property in the options argument of the constructor or the default value ("code"). its value is either "code" or "none". examples using resolvedoptions const displaynames = new intl.displaynames(['de-de'], {type: 'region'}); const usedoptions = displaynames.resolvedoptions(); console.log(usedoptions.locale); // "de-de" console.log(usedoptions.style); // "long" console.log(usedoptions.type); // "region" console.log(usedoptions.fallback); // "code" specifications specification intl.displaynamesthe definition of 'resolvedoptions()' in that specification. ...

Intl​.List​Format​.prototype​.resolvedOptions() - JavaScript
syntax listformat.resolvedoptions() return value an object with properties reflecting the locale and formatting options computed during the construction of the given listformat object. description the object returned by resolvedoptions() has the following properties: locale the bcp 47 language tag for the locale actually used. if any unicode extension values were requested in the input bcp 47 language tag that led to this locale, the key-value pairs that were requested and are supported for this locale are included in locale. ...
... the locale actually used. if any unicode extension values were requested in the input bcp 47 language tag that led to this locale, the key-value pairs that were requested and are supported for this locale are included in locale. style the value provided for this property in the options argument of the constructor or the default value ("long"). its value is either "long", "short", or "narrow". type the value provided for this property in the options argument of the constructor or the default value ("conjunction"). its value is either "conjunction", "disjunction", or "unit". examples using resolvedoptions const delistformatter = new intl.listformat("de-de", { style: "short" }); const usedoptions = de.resolvedoptions(); console.log(usedoptions.locale); // "de-de" console.log(usedoptions...
... options argument of the constructor or the default value ("conjunction"). its value is either "conjunction", "disjunction", or "unit". examples using resolvedoptions const delistformatter = new intl.listformat("de-de", { style: "short" }); const usedoptions = de.resolvedoptions(); console.log(usedoptions.locale); // "de-de" console.log(usedoptions.style); // "short" console.log(usedoptions.type); // "conjunction" (the default value) specifications specification intl.listformatthe definition of 'resolvedoptions()' in that specification. ...

Intl.Locale.prototype.calendar - JavaScript
description the calendar property returns the part of the locale that indicates the locale's calendar era. while most of the world uses the gregorian calendar, there are several regional calendar eras used around the world. the following table shows all the valid unicode calendar key strings, along with a description of the calendar era they represent. ...
... the islamicc calendar key has been deprecated. please use islamic-civil. islamicc civil (algorithmic) arabic calendar examples adding a calendar in the locale string calendar eras fall under the category of locale key "extension keys". these keys add additional data about the locale, and are added to locale identifiers by using the -u extension. thus, the calendar era type can be added to the inital locale identifier string that is passed into the intl.locale constructor. to add the calendar type, first add the -u extension to the string. next, add the -ca extension to indicate that you are adding a calendar type. finally, add the calendar era to the string. let frbuddhist = new intl.locale("fr-fr-u-ca-buddhist"); console.log(frbuddhist.calendar); // prints "buddh...
...set the calendar property of the configuration object to your desired calendar era, and then pass it into the constructor. ...

Intl.Locale.prototype.hourCycle - JavaScript
the intl.locale.prototype.hourcycle property is an accessor property that returns the time keeping format convention used by the locale. description there are 2 main types of time keeping conventions (clocks) used around the world: the 12 hour clock and the 24 hour clock. the hourcycle property makes it easier for javascript programmers to access the clock type used by a particular locale. like other additional locale data, hour cycle type is an extension subtag, which extends the data contained in a locale string. the hour cycle type can have several different values, which are listed in the table below. valid hour cycle types hour cycle type description h12 hour system using 1–12; corresponds to 'h' in patterns. the 12 hour clock, with midnight starting at ...
...h midnight starting at 24:00. examples these examples will show you how to add hour cycle data to your locale object. adding an hour cycle via the locale string in the unicode locale string spec, the hour cycle is a locale string "extension subtag". these subtags add additional data about the locale, and are added to locale identifiers by using the -u extension key. thus, the hour cycle type can be added to the inital locale identifier string that is passed into the locale constructor. to add the hour cycle type, first add the -u extension key to the string. next, add the -hc extension key to indicate that you are adding an hour cycle. finally, add the hour cycle type to the string. let fr24hour = new intl.locale("fr-fr-u-hc-h23"); console.log(fr24hour.hourcycle); // prints "h23" a...
...add the -hc extension key to indicate that you are adding an hour cycle. finally, add the hour cycle type to the string. let fr24hour = new intl.locale("fr-fr-u-hc-h23"); console.log(fr24hour.hourcycle); // prints "h23" adding an hour cycle via the configuration object argument the intl.locale constructor has an optional configuration object argument, which can contain any of several extension types, including hour cycle types. set the hourcycle property of the configuration object to your desired hour cycle type, and then pass it into the constructor. let us12hour = new intl.locale("en-us", {hourcycle: "h12"}); console.log(us12hour.hourcycle); // prints "h12" specifications specification ecmascript internationalization api (ecma-402) ...

Intl.NumberFormat.prototype.format() - JavaScript
the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax numberformat.format(number) parameters number a number or bigint to format. description the format getter function formats a number into a string according to the locale and formatting options of this numberformat object. ...
...ions = { style: 'currency', currency: 'rub' }; var numberformat = new intl.numberformat('ru-ru', options); console.log(numberformat.format(654321.987)); // → "654 321,99 руб." using format with map use the format getter function for formatting all numbers in an array. note that the function is bound to the numberformat from which it was obtained, so it can be passed directly to array.prototype.map. this is considered a historical artefact, as part of a convention which is no longer followed for new features, but is preserved to maintain compatibility with existing programs. var a = [123456.789, 987654.321, 456789.123]; var numberformat = new intl.numberformat('es-es'); var formatted = a.map(n => numberformat.format(n)); console.log(formatted.join('; ')); // → "123.456,789; 987.654...
...ity with existing programs. var a = [123456.789, 987654.321, 456789.123]; var numberformat = new intl.numberformat('es-es'); var formatted = a.map(n => numberformat.format(n)); console.log(formatted.join('; ')); // → "123.456,789; 987.654,321; 456.789,123" specifications specification ecmascript internationalization api (ecma-402)the definition of 'intl.numberformat.prototype.format' in that specification. ...

Intl.PluralRules.prototype.resolvedOptions() - JavaScript
syntax pluralrule.resolvedoptions() return value a new object with properties reflecting the locale and plural formatting options computed during the initialization of the given pluralrules object. description the resulting object has the following properties: locale the bcp 47 language tag for the locale actually used. if any unicode extension values were requested in the input bcp 47 language tag that led to this locale, the key-value pairs that were requested and are supported for this locale are included in locale. ...
...bcp 47 language tag for the locale actually used. if any unicode extension values were requested in the input bcp 47 language tag that led to this locale, the key-value pairs that were requested and are supported for this locale are included in locale. pluralcategories an array of plural categories used by the given locale, seleced from the list "zero", "one", "two", "few", "many" and "other". type the type used (cardinal or ordinal). only one of the following two groups of properties is included: minimumintegerdigits minimumfractiondigits maximumfractiondigits the values provided for these properties in the options argument or filled in as defaults. these properties are present only if neither minimumsignificantdigits nor maximumsignificantdigits was provided in the options argume...
...ovided in the options argument. examples using the resolvedoptions method var de = new intl.pluralrules('de-de'); var usedoptions = de.resolvedoptions(); usedoptions.locale; // "de-de" usedoptions.maximumfractiondigits; // 3 usedoptions.minimumfractiondigits; // 0 usedoptions.minimumintegerdigits; // 1 usedoptions.pluralcategories; // array [ "one", "other" ] usedoptions.type; // "cardinal" specifications specification ecmascript internationalization api (ecma-402)the definition of 'intl.pluralrules.prototype.resolvedoptions' in that specification. ...

Intl.RelativeTimeFormat.prototype.formatToParts() - JavaScript
the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax relativetimeformat.formattoparts(value, unit) parameters value numeric value to use in the internationalized relative time message. unit unit to use in the relative time internationalized message. possible values are: "year", "quarter", "month", "week", "day", "hour", "minute", "second". plural forms are also permitted. ...
...ue numeric value to use in the internationalized relative time message. unit unit to use in the relative time internationalized message. possible values are: "year", "quarter", "month", "week", "day", "hour", "minute", "second". plural forms are also permitted. return value an array of objects containing the formatted relative time in parts. description the intl.relativetimeformat.prototype.formattoparts method is a version of the format method which it returns an array of objects which represent "parts" of the object, separating the formatted number into its consituent parts and separating it from other surrounding text. these objects have two properties: type a numberformat formattoparts type, and value, which is the string which is the component of the output. if a "part" came fr...
...which is the component of the output. if a "part" came from numberformat, it will have a unit property which indicates the unit being formatted; literals which are part of the larger frame will not have this property. examples using formattoparts const rtf = new intl.relativetimeformat("en", { numeric: "auto" }); // format relative time using the day unit rtf.formattoparts(-1, "day"); // > [{ type: "literal", value: "yesterday"}] rtf.formattoparts(100, "day"); // > [{ type: "literal", value: "in " }, // > { type: "integer", value: "100", unit: "day" }, // > { type: "literal", value: " days" }] specifications specification status comment ecmascript internationalization api (ecma-402)the definition of 'relativetimeformat.formattoparts()' in that specification. ...

Number.prototype.toFixed() - JavaScript
ementations may optionally support a larger range of values. if this argument is omitted, it is treated as 0. return value a string representing the given number using fixed-point notation. exceptions rangeerror if digits is too small or too large. values between 0 and 100, inclusive, will not cause a rangeerror. implementations are allowed to support larger and smaller values as chosen. typeerror if this method is invoked on an object that is not a number. description tofixed() returns a string representation of numobj that does not use exponential notation and has exactly digits digits after the decimal place. the number is rounded if necessary, and the fractional part is padded with zeros if necessary so that it has the specified length. if the absolute value of numobj is great...
... number. description tofixed() returns a string representation of numobj that does not use exponential notation and has exactly digits digits after the decimal place. the number is rounded if necessary, and the fractional part is padded with zeros if necessary so that it has the specified length. if the absolute value of numobj is greater or equal to 1e+21, this method simply calls number.prototype.tostring() and returns a string in exponential notation. warning: floating point numbers cannot represent all decimals precisely in binary. this can lead to unexpected results, such as 0.1 + 0.2 === 0.3 returning false . examples using tofixed let numobj = 12345.6789 numobj.tofixed() // returns '12346': note rounding, no fractional part numobj.tofixed(1) // returns '12345.7': no...
...35.tofixed(1) // returns '2.4'. note it rounds up 2.55.tofixed(1) // returns '2.5'. note it rounds down - see warning above -2.34.tofixed(1) // returns -2.3 (due to operator precedence, negative number literals don't return a string...) (-2.34).tofixed(1) // returns '-2.3' specifications specification ecmascript (ecma-262)the definition of 'number.prototype.tofixed' in that specification. ...

Number.prototype.toLocaleString() - JavaScript
} catch (e) { return e.name === 'rangeerror'; } return false; } prior to es5.1, implementations were not required to throw a range error exception if tolocalestring is called with arguments. a check that works in all hosts, including those supporting ecma-262 prior to ed 5.1, is to test for the features specified in ecma-402 that are required to support regional options for number.prototype.tolocalestring directly: function tolocalestringsupportsoptions() { return !!(typeof intl == 'object' && intl && typeof intl.numberformat == 'function'); } this tests for a global intl object, checks that it's not null and that it has a numberformat property that is a function. using locales this example shows some of the variations in localized number formats. in order to get the format o...
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Object.getPrototypeOf() - JavaScript
the object.getprototypeof() method returns the prototype (i.e. the value of the internal [[prototype]] property) of the specified object. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax object.getprototypeof(obj) parameters obj the object whose prototype is to be returned. return value the prototype of the given object. if there are no inherited properties, null is returned. ...
...hub repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax object.getprototypeof(obj) parameters obj the object whose prototype is to be returned. return value the prototype of the given object. if there are no inherited properties, null is returned. examples using getprototypeof var proto = {}; var obj = object.create(proto); object.getprototypeof(obj) === proto; // true non-object coercion in es5, it will throw a typeerror exception if the obj parameter isn't an object. ...
...alue the prototype of the given object. if there are no inherited properties, null is returned. examples using getprototypeof var proto = {}; var obj = object.create(proto); object.getprototypeof(obj) === proto; // true non-object coercion in es5, it will throw a typeerror exception if the obj parameter isn't an object. in es2015, the parameter will be coerced to an object. object.getprototypeof('foo'); // typeerror: "foo" is not an object (es5 code) object.getprototypeof('foo'); // string.prototype (es2015 code) specifications specification ecmascript (ecma-262)the definition of 'object.getprototypeof' in that specification. ...

RegExp.prototype[@@match]() - JavaScript
examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax regexp[symbol.match](str) parameters str a string that is a target of the match. return value an array containing the entire match result and any parentheses-captured matched results, or null if there were no matches. description this method is called internally in string.prototype.match(). for example, the following two examples return same result. 'abc'.match(/a/); /a/[symbol.match]('abc'); this method exists for customizing match behavior within regexp subclasses. examples direct call this method can be used in almost the same way as string.prototype.match(), except the different this and the different arguments order. let re = /[0-9]+/g; let str = '2016-01-02'; ...
...ch(), except the different this and the different arguments order. let re = /[0-9]+/g; let str = '2016-01-02'; let result = re[symbol.match](str); console.log(result); // ["2016", "01", "02"] using @@match in subclasses subclasses of regexp can override the [@@match]() method to modify the default behavior. class myregexp extends regexp { [symbol.match](str) { let result = regexp.prototype[symbol.match].call(this, str); if (!result) return null; return { group(n) { return result[n]; } }; } } let re = new myregexp('([0-9]+)-([0-9]+)-([0-9]+)'); let str = '2016-01-02'; let result = str.match(re); // string.prototype.match calls re[@@match]. console.log(result.group(1)); // 2016 console.log(result.group(2)); // 01 console.log(result.group(3)); // 02 ...
... result[n]; } }; } } let re = new myregexp('([0-9]+)-([0-9]+)-([0-9]+)'); let str = '2016-01-02'; let result = str.match(re); // string.prototype.match calls re[@@match]. console.log(result.group(1)); // 2016 console.log(result.group(2)); // 01 console.log(result.group(3)); // 02 specifications specification ecmascript (ecma-262)the definition of 'regexp.prototype[@@match]' in that specification. ...

RegExp.prototype[@@matchAll]() - JavaScript
r this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax regexp[symbol.matchall](str) parameters str a string that is a target of the match. return value an iterator. description this method is called internally in string.prototype.matchall(). for example, the following two examples return same result. 'abc'.matchall(/a/); /a/[symbol.matchall]('abc'); this method exists for customizing the behavior of matchall() in regexp subclasses. examples direct call this method can be used in almost the same way as string.prototype.matchall(), except for the different value of this and the different order of arguments. let re = ...
...r = '2016-01-02'; let result = re[symbol.matchall](str); console.log(array.from(result, x => x[0])); // ["2016", "01", "02"] using @@matchall in subclasses subclasses of regexp can override the [@@matchall]() method to modify the default behavior. ...
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RegExp.prototype.flags - JavaScript
the flags property returns a string consisting of the flags of the current regular expression object. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. ...
...se clone https://github.com/mdn/interactive-examples and send us a pull request. property attributes of regexp.prototype.flags writable no enumerable no configurable yes description flags in the flags property are sorted alphabetically (from left to right, e.g. "gimsuy"). ...
... a pull request. property attributes of regexp.prototype.flags writable no enumerable no configurable yes description flags in the flags property are sorted alphabetically (from left to right, e.g. "gimsuy"). polyfill if (regexp.prototype.flags === undefined) { object.defineproperty(regexp.prototype, 'flags', { configurable: true, get: function() { return this.tostring().match(/[gimsuy]*$/)[0]; } }); } examples using flags /foo/ig.flags; // "gi" /bar/myu.flags; // "muy" specifications specification ecmascript (ecma-262)the definition of 'regexp.prototype.flags' in that specification. ...

String.prototype.repeat() - JavaScript
tring containing the specified number of copies of the given string. exceptions rangeerror: repeat count must be non-negative. rangeerror: repeat count must be less than infinity and not overflow maximum string size. polyfill this method has been added to the ecmascript 2015 specification and may not be available in all javascript implementations yet. however, you can polyfill string.prototype.repeat() with the following snippet: if (!string.prototype.repeat) { string.prototype.repeat = function(count) { 'use strict'; if (this == null) throw new typeerror('can\'t convert ' + this + ' to object'); var str = '' + this; // to convert string to integer. count = +count; // check nan if (count != count) count = 0; if (count < 0) throw ne...
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String.prototype.startsWith() - JavaScript
alue true if the given characters are found at the beginning of the string; otherwise, false. description this method lets you determine whether or not a string begins with another string. this method is case-sensitive. polyfill this method has been added to the ecmascript 2015 specification and may not be available in all javascript implementations yet. ...
... the string; otherwise, false. description this method lets you determine whether or not a string begins with another string. this method is case-sensitive. polyfill this method has been added to the ecmascript 2015 specification and may not be available in all javascript implementations yet. however, you can polyfill string.prototype.startswith() with the following snippet: if (!string.prototype.startswith) { object.defineproperty(string.prototype, 'startswith', { value: function(search, rawpos) { var pos = rawpos > 0 ? rawpos|0 : 0; return this.substring(pos, pos + search.length) === search; } }); } a more robust (fully es2015 specification compliant), but less performant and compact, polyfill is available on github by mathias bynens. ...
...on github by mathias bynens. examples using startswith() //startswith let str = 'to be, or not to be, that is the question.' console.log(str.startswith('to be')) // true console.log(str.startswith('not to be')) // false console.log(str.startswith('not to be', 10)) // true specifications specification ecmascript (ecma-262)the definition of 'string.prototype.startswith' in that specification. ...

String.prototype.substr() - JavaScript
support negative values for the start index. ...
...ng} */ string.prototype.substr = function(substr) { return function(start, length) { // call the original method return substr.call(this, // did we get a negative start, calculate how much it is from the beginning of the string // adjust the start parameter for negative value start < 0 ? ...
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String.prototype.toLocaleLowerCase() - JavaScript
s. if multiple locales are given in an array, the best available locale is used. the default locale is the host environment’s current locale. return value a new string representing the calling string converted to lower case, according to any locale-specific case mappings. exceptions a rangeerror ("invalid language tag: xx_yy") is thrown if a locale argument isn't a valid language tag. a typeerror ("invalid element in locales argument") is thrown if an array element isn't of type string. description the tolocalelowercase() method returns the value of the string converted to lower case according to any locale-specific case mappings. tolocalelowercase() does not affect the value of the string itself. in most cases, this will produce the same result as tolowercase(), but for some loca...
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String.prototype.toLocaleUpperCase() - JavaScript
s. if multiple locales are given in an array, the best available locale is used. the default locale is the host environment’s current locale. return value a new string representing the calling string converted to upper case, according to any locale-specific case mappings. exceptions a rangeerror ("invalid language tag: xx_yy") is thrown if a locale argument isn't a valid language tag. a typeerror ("invalid element in locales argument") is thrown if an array element isn't of type string. description the tolocaleuppercase() method returns the value of the string converted to upper case according to any locale-specific case mappings. tolocaleuppercase() does not affect the value of the string itself. in most cases, this will produce the same result as touppercase(), but for some loca...
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String.prototype.trimEnd() - JavaScript
ull request. syntax str.trimend(); str.trimright(); return value a new string representing the calling string stripped of whitespace from its (right) end. description the trimend() / trimright() methods return the string stripped of whitespace from its right end. trimend() or trimright() do not affect the value of the string itself. ...
... the trimend() / trimright() methods return the string stripped of whitespace from its right end. trimend() or trimright() do not affect the value of the string itself. aliasing for consistency with functions like string.prototype.padend the standard method name is trimend. however, for web compatibility reasons, trimright remains as an alias to trimend. ...
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TypedArray.name - JavaScript
the typedarray.name property represents a string value of the typed array constructor name. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. property attributes of typedarray.name writable no enumerable no configurable no description typedarray objects differ from each other in the number of bytes per element and in the way the bytes are interpreted. the name property describes of what data type the array consists. the first part can be int for "integer" or uint for an "unsigned integer", also float for "floating point" ...
...please see uint8clampedarray for more details. ...
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button.type - Archive of obsolete content
« xul reference home type type: one of the values below the type of button. if this attribute is not present, a normal button is created. leave the attribute out for a normal button. checkbox this type of button can be in two states. the user can click the button to switch between the states. this is not the same as a checkbox because it looks like a button. menu set the type attribute to the value menu to create a button with a menu popup. place a menupopup element inside the button in this case. the user may click anywhere on the button to open and close the menu. menu-button you can also use the value menu-button to create a button with a menu. ...
...n the states. this is not the same as a checkbox because it looks like a button. menu set the type attribute to the value menu to create a button with a menu popup. place a menupopup element inside the button in this case. the user may click anywhere on the button to open and close the menu. menu-button you can also use the value menu-button to create a button with a menu. unlike the menu type, this type requires the user to press the arrow to open the menu, but a different command may be invoked when the main part of the button is pressed. panel similar to the menu type, this opens a popup. place a panel element inside the button. panel elements are popups that support any type of content. radio the button acts like a radio button. only one button in the group can be on a once...

editortype - Archive of obsolete content
html an html editor. text a plaintext editor. ...
... html an html editor. text a plaintext editor. ...

textbox.type - Archive of obsolete content
« xul reference type type: string set to the value autocomplete to have an autocomplete textbox. ...
... « xul reference type type: string set to the value autocomplete to have an autocomplete textbox. ...

type - Archive of obsolete content
« xul reference type type: string gets and sets the value of the type attribute. ...
... « xul reference type type: string gets and sets the value of the type attribute. ...

Date.prototype.toLocaleFormat() - Archive of obsolete content
the non-standard tolocaleformat() method converts a date to a string using the specified formatting. intl.datetimeformat is an alternative to format dates in a standards-compliant way. see also the newer version of date.prototype.tolocaledatestring(). this feature has been removed and will no longer work in firefox 58+. see warning: date.prototype.tolocaleformat is deprecated for more information and migration help. syntax dateobj.tolocaleformat(formatstring) parameters formatstring a format string in the same format expected by the strftime() function in c. return value a string representing the given date using the specified formatting. description the tolocaleformat() method provides greater software control over the formatting of the generated date and/or time. name...
...s method. examples using tolocaleformat() var today = new date(); var date = today.tolocaleformat('%a, %b %e, %y'); in this example, tolocaleformat() returns a string such as "wednesday, october 3, 2007". note that the format string in this example is not properly localized, which will result in the problems described above. polyfill when using the datejs library you can polyfill date.prototype.tolocaledatestring() like this: if (!date.prototype.tolocaleformat) { (function() { date.prototype.tolocaleformat = function(formatstring) { return this.format(formatstring); }; }()); } specifications not part of any standard. ...

Prototype-based programming - MDN Web Docs Glossary: Definitions of Web-related terms
prototype-based programming is a style of object-oriented programming in which classes are not explicitly defined, but rather derived by adding properties and methods to an instance of another class or, less frequently, adding them to an empty object. in simple words: this type of style allows the creation of an object without first defining its class. ...
... prototype-based programming is a style of object-oriented programming in which classes are not explicitly defined, but rather derived by adding properties and methods to an instance of another class or, less frequently, adding them to an empty object. in simple words: this type of style allows the creation of an object without first defining its class. ...

Prototype - MDN Web Docs Glossary: Definitions of Web-related terms
a prototype is a model that displays the appearance and behavior of an application or product early in the development lifecycle. ...
... a prototype is a model that displays the appearance and behavior of an application or product early in the development lifecycle. ...

Type - MDN Web Docs Glossary: Definitions of Web-related terms
type is a characteristic of a value affecting what kind of data it can store, and the structure that the data will adhere to. for example, a boolean data type can hold only a true or false value at any given time, whereas a string has the ability to hold a string or a sequence of characters, a number can hold numerical values of any kind, and so on. a value's data type also affects the operations that are valid on that value. for example, a value of type number can be multiplied by another number, but not by a string - even if that string contains only a number, such as the string "2". types also provides us with useful knowledge about the comparison between different values. ...
...cal values of any kind, and so on. a value's data type also affects the operations that are valid on that value. for example, a value of type number can be multiplied by another number, but not by a string - even if that string contains only a number, such as the string "2". types also provides us with useful knowledge about the comparison between different values. comparison between structured types is not always an easy assumption, as even if the previous data structure is the same, there could be inherited structures inside of the prototype chain. if you are unsure of the type of a value, you can use the typeof operator. ...

How can we design for all types of users? - Learn web development
o a square). rem-based sizes: rem this unit is proportional to the root element's font size and is expressed as portions of 1, like em. suppose we wanted a base font size of 16px and an h1 (main heading) at the equivalent of 32px, yet if within the h1 we find a span with the subheading class, it too must be rendered at the default font size (usually 16px). ...
...uble going from one line to the next if the lines were too long. the solution? columns. of course the problem doesn't go away when we switch to the web. the reader's eyes act like a shuttle going from line to line. to make it easier on people's eyes, limit line width to around 60 or 70 characters. to achieve this, you can specify a size for your text's container. let's consider this html: <!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <title>font size experiment</title> </head> <body> <div class="container"> <h1>this is our main heading <span class="subheading">this is our subheading</span> </h1> <p>[lengthly text that spans many lines]</p> </div> </body> </html> we have a div with class container. we can style the div either to set its width ...

AddonType
add-on types hold useful information about each type of add-on that may be installed. they are mostly used to help the ui know how to display the different types of add-on. properties attribute type description id string the unique id for the type. name string the localized name for the type. uipriority integer a number used to determine the order of types displayed in the user interface. the lower the number the higher in the list the type will appear. built-in values: value category 2000 locale 4000 extension 5000 theme 6000 plugin vie...
...ne the order of types displayed in the user interface. the lower the number the higher in the list the type will appear. built-in values: value category 2000 locale 4000 extension 5000 theme 6000 plugin viewtype integer the type of ui to use to display this type of add-on in the ui. if undefined the type will not appear in the ui. flags integer additional behavior flags for the type. ...

PRFileType
pr_file_directory the information in the structure describes a directory. pr_file_other the information in the structure describes some other kind of file system object. ...
... pr_file_directory the information in the structure describes a directory. pr_file_other the information in the structure describes some other kind of file system object. ...

PRThreadType
description threads can be either user threads or system threads. nspr allows the client to synchronize the termination of all user threads and ignores those created as system threads. this arrangement implies that a system thread should not have volatile data that needs to be safely stored away. ...
... description threads can be either user threads or system threads. nspr allows the client to synchronize the termination of all user threads and ignores those created as system threads. this arrangement implies that a system thread should not have volatile data that needs to be safely stored away. ...

JSExnType
this article covers features introduced in spidermonkey 17 possible exception types. value prototype in javascript jsexn_none an unthrowable error. (lower bound) jsexn_err error jsexn_internalerr internalerror jsexn_evalerr evalerror jsexn_rangeerr rangeerror jsexn_referenceerr referenceerror jsexn_syntaxerr syntaxerror jsexn_typeerr typeerror jsexn_urierr urierror jsexn_limit (upper bound) description these types are part of a jserrorformatstring structure. they define which error to throw in case of a runtime error. jsexn_none marks an unthrowable error. ...
... jsexn_referenceerr referenceerror jsexn_syntaxerr syntaxerror jsexn_typeerr typeerror jsexn_urierr urierror jsexn_limit (upper bound) description these types are part of a jserrorformatstring structure. they define which error to throw in case of a runtime error. jsexn_none marks an unthrowable error. ...

JSType
the values of the jstype enumeration represent the types of javascript values. value description jstype_void the undefined value. jstype_object javascript objects. jstype_function functions. jstype_string strings. jstype_number numbers. jstype_boolean boolean values, true and false. jstype_null the null value. jstype_symbol symbols. ...
... value description jstype_void the undefined value. jstype_object javascript objects. jstype_function functions. jstype_string strings. jstype_number numbers. jstype_boolean boolean values, true and false. jstype_null the null value. jstype_symbol symbols. ...

JS_GetArrayPrototype
this article covers features introduced in spidermonkey 24 retrieves the original, canonical array.prototype for an object's global object. syntax jsobject * js_getarrayprototype(jscontext *cx, js::handleobject forobj); name type description cx jscontext * pointer to a javascript context from which to derive runtime information. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. forobj js::handleobject an object from the global whose array.prototype is being retrieved. description js_getarrayprototype() retrieves the original array.prototype of a specified object, obj. if an error occurs, it returns null. note: this expression might have different values over time if the global array pro...
...rom the global whose array.prototype is being retrieved. description js_getarrayprototype() retrieves the original array.prototype of a specified object, obj. if an error occurs, it returns null. note: this expression might have different values over time if the global array property is modified, but this method returns only the original value. ...

JS_GetClassPrototype
get the builtin class prototype object. syntax bool js_getclassprototype(jscontext *cx, jsprotokey key, js::mutablehandle<jsobject*> objp); name type description cx jscontext * a context. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. key jsprotokey the key of the prototype. objp js::mutablehandle&lt;jsobject*&gt; out parameter. if successful, receive the class prototype object. description js_getclassprototype gets the builtin class costructor for the specified prototype key. if successful, js_getclassprototype stores the class prototype object to *objp and returns true, otherwise returns false and the value of *objp is undefined. see also mxr id...
...lt;jsobject*&gt; out parameter. if successful, receive the class prototype object. description js_getclassprototype gets the builtin class costructor for the specified prototype key. if successful, js_getclassprototype stores the class prototype object to *objp and returns true, otherwise returns false and the value of *objp is undefined. ...

JS_GetFunctionPrototype
this article covers features introduced in spidermonkey 17 retrieves the original, canonical function.prototype for an object's global object. syntax jsobject * js_getfunctionprototype(jscontext *cx, js::handleobject forobj); name type description cx jscontext * pointer to a javascript context from which to derive runtime information. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. forobj js::handleobject an object from the global whose function.prototype is being retrieved. description js_getfunctionprototype() retrieves the original function.prototype of a specified object, obj. if an error occurs, it returns null. note: this expression might have different values over ti...
...hose function.prototype is being retrieved. description js_getfunctionprototype() retrieves the original function.prototype of a specified object, obj. if an error occurs, it returns null. note: this expression might have different values over time if the global function property is modified, but this method returns only the original value. ...

JS_GetObjectPrototype
this article covers features introduced in spidermonkey 17 retrieves the original, canonical object.prototype for an object's global object. syntax jsobject * js_getobjectprototype(jscontext *cx, js::handleobject forobj); name type description cx jscontext * pointer to a javascript context from which to derive runtime information. requires request. in a js_threadsafe build, the caller must be in a request on this jscontext. forobj js::handleobject an object from the global whose object.prototype is being retrieved. description js_getobjectprototype() retrieves the original object.prototype of a specified object, obj. if an error occurs, it returns null. note: this expression might have different values over time if the global obje...
...he global whose object.prototype is being retrieved. description js_getobjectprototype() retrieves the original object.prototype of a specified object, obj. if an error occurs, it returns null. note: this expression might have different values over time if the global object property is modified, but this method returns only the original value. ...

nsMsgNavigationType
the nsmsgnavigationtype interface contains constants used for message navigation in thunderbird. for example to move forward a message, you would call: // assuming gdbview is a global nsimsgdbview var resultid = new object(); var resultindex = new object(); var threadindex = new object(); gdbview.viewnavigate(components.interfaces.nsmsgnavigationtype.nextmessage, resultid, resultindex, threadindex, true); the nsmsgnavigationtype interface is defined as a global variable in thunderbird: var nsmsgviewcommandtype = components.interfaces.nsmsgviewcommandtype; mailnews/base/public/nsimsgdbview.idlscriptable please add a summary to this article. last changed in gecko 1.9 (firefox 3) constants name value description firstmessage 1 go to the first message in th...
...s name value description firstmessage 1 go to the first message in the view. nextmessage 2 go to the next message in the view. will wrap around if the wrap flag is set to true. previousmessage 3 go to the previous message in the view. will wrap around if the wrap flag is set to true. lastmessage 4 go to the last message in the view. togglethreadkilled 5 must match nsmsgviewcommandtype togglethreadkilled. firstunreadmessage 6 go to the first unread message in the view. nextunreadmessage 7 go to the next unread message in the view. will wrap around if the wrap flag is set to true. previousunreadmessage 8 go to the previous unread message in the view. will wrap around if the wrap flag is set to true. lastunreadmessage 9 go to the last unread message in the view. nex...

nsMsgViewFlagsType
the nsmsgviewflagstype interface contains constants used for view flags in thunderbird. this interface isn't ever implemented. it is only used to store constants. ...
... the nsmsgviewflagstype interface contains constants used for view flags in thunderbird. this interface isn't ever implemented. it is only used to store constants. ...

nsMsgViewType
the nsmsgviewtype interface contains constants used for views in thunderbird. this interface isn't ever implemented. it is only used to store constants. ...
... the nsmsgviewtype interface contains constants used for views in thunderbird. this interface isn't ever implemented. it is only used to store constants. ...

CSSPrimitiveValue.primitiveType - Web APIs
possible values are: constant description css_attr the value is an attr() function. the value can be obtained by using the getstringvalue() method. css_cm the value is a <length> in centimeters. the value can be obtained by using the getfloatvalue() method. css_counter the value is a counter or counters function. the value can be obtained by using the getcountervalue() method. css_deg the value is an <angle> in degrees. the value can be obtained by using the getfloatvalue() method. ...
...stringvalue() method. css_unknown the value is not a recognized css2 value. the value can only be obtained by using the csstext attribute. css_uri the value is a <uri>. the value can be obtained by using the getstringvalue() method. example var cs = window.getcomputedstyle(document.body); var cssvalue = cs.getpropertycssvalue("color"); console.log(cssvalue.primitivetype); specifications specification status comment document object model (dom) level 2 style specificationthe definition of 'cssprimitivevalue.primitivetype' in that specification. obsolete initial definition ...

CSSValue.cssValueType - Web APIs
possible values are: constant description css_custom the value is a custom value. css_inherit the value is inherited and the csstext contains "inherit". css_primitive_value the value is a primitive value and an instance of the cssprimitivevalue interface can be obtained by using binding-specific casting methods on this instance of the cssvalue interface. ...
...he cssvalue interface. css_value_list the value is a cssvalue list and an instance of the cssvaluelist interface can be obtained by using binding-specific casting methods on this instance of the cssvalue interface. example var styledeclaration = document.stylesheets[0].cssrules[0].style; var cssvalue = styledeclaration.getpropertycssvalue("color"); console.log(cssvalue.cssvaluetype); specifications specification status comment document object model (dom) level 2 style specificationthe definition of 'cssvalue.cssvaluetype' in that specification. obsolete initial definition ...

ClipboardItem.getType() - Web APIs
the gettype() method of the clipboarditem interface returns a promise that resolves with a blob of the requested mime type or an error if the mime type is not found. syntax var blob = clipboarditem.gettype(type); parameters type a valid mime type. return value a promise that resolves with a blob object. exceptions domexception the type does not match a known mime type. typeerror no parameter is specified or the type is not that of the clipboarditem. examples in the following example, we're returning all items on the clipboard via the clipboard.read() method. then utilizing the clipboarditem.types property to set the gettype() argument and return the corresponding blob object. async function getclipboardcontents() { try { const clipboarditems = await navig...
...n the following example, we're returning all items on the clipboard via the clipboard.read() method. then utilizing the clipboarditem.types property to set the gettype() argument and return the corresponding blob object. async function getclipboardcontents() { try { const clipboarditems = await navigator.clipboard.read(); for (const clipboarditem of clipboarditems) { for (const type of clipboarditem.types) { const blob = await clipboarditem.gettype(type); // we can now use blob here } } } catch (err) { console.error(err.name, err.message); } } specifications specification status comment clipboard api and eventsthe definition of 'clipboarditem' in that specification. working draft initial definition. ...

ClipboardItem.types - Web APIs
the read-only types property of the clipboarditem interface returns an array of mime types available within the clipboarditem syntax var types = clipboarditem.types; value an array of available mime types. examples in the below example, we're returning all items on the clipboard via the clipboard.read() method. then checking the types property for available types before utilizing the clipboarditem.gettype() method to return the blob object. if no clipboards contents is found for the specified type, an error is returned. ...
...method. then checking the types property for available types before utilizing the clipboarditem.gettype() method to return the blob object. if no clipboards contents is found for the specified type, an error is returned. async function getclipboardcontents() { try { const clipboarditems = await navigator.clipboard.read(); for (const clipboarditem of clipboarditems) { for (const type of clipboarditem.types) { const blob = await clipboarditem.gettype(type); // we can now use blob here } } } catch (err) { console.error(err.name, err.message); } } specifications specification status comment clipboard api and eventsthe definition of 'clipboarditem' in that specification. working draft initial definition. ...

DataTransfer.mozTypesAt() - Web APIs
the datatransfer.moztypesat() method returns a list of the format types that are stored for an item at the specified index. if the index is not in the range from 0 to the number of items minus one, an empty string list is returned. note: this method is gecko-specific. syntax nsivariant datatransfer.moztypesat(index); arguments index a unsigned long that is the index of the data for which to retrieve the types. return value nsivariant a list of data formats (which are strings). if the index is not in the range from 0 to the number of items minus one, an empty string list is returned. example this example shows the use of the moztypesat() method in a drop event handler. function drop_handler(event) { var dt = event.datatransfer; var count = dt.mozitemcount; output("i...
...index is not in the range from 0 to the number of items minus one, an empty string list is returned. example this example shows the use of the moztypesat() method in a drop event handler. function drop_handler(event) { var dt = event.datatransfer; var count = dt.mozitemcount; output("items: " + count + "\n"); for (var i = 0; i < count; i++) { output(" item " + i + ":\n"); var types = dt.moztypesat(i); for (var t = 0; t < types.length; t++) { output(" " + types[t] + ": "); try { var data = dt.mozgetdataat(types[t], i); output("(" + (typeof data) + ") : <" + data + " >\n"); } catch (ex) { output("<>\n"); dump(ex); } } } } specifications this method is not defined in any web standard. ...

Document.doctype - Web APIs
returns the document type declaration (dtd) associated with current document. the returned object implements the documenttype interface. use domimplementation.createdocumenttype() to create a documenttype. syntax doctype = document.doctype; doctype is a read-only property. example var doctypeobj = document.doctype; console.log( "doctypeobj.name: " + doctypeobj.name + "\n" + "doctypeobj.internalsubset: " + doctypeobj.internalsubset + "\n" + "doctypeobj.publicid: " + doctypeobj.publicid + "\n" + "doctypeobj.systemid: " + doctypeobj.systemid ); notes the property returns null if there is no dtd associated with the current document. dom level 2 doesn't support editing the document type declaration. specifications specificati...
...n" + "doctypeobj.publicid: " + doctypeobj.publicid + "\n" + "doctypeobj.systemid: " + doctypeobj.systemid ); notes the property returns null if there is no dtd associated with the current document. dom level 2 doesn't support editing the document type declaration. specifications specification status comment domthe definition of 'document: doctype' in that specification. living standard ...

InputEvent.inputType - Web APIs
the inputtype read-only property of the inputevent interface returns the type of change made to editible content. possible changes include for example inserting, deleting, and formatting text. syntax var astring = inputevent.inputtype; value a domstring containing the type of input that was made. there are many possible values, such as inserttext, deletecontentbackward, insertfrompaste, and formatbold. for a complete list of the available input types, see the attributes section of the input events level 1 spec. examples this example logs the inputtype for input events on an editable <div>. html <p id="log">input type: </p> <div contenteditable="true" style="margin: 20px;padding: 20px;border:2px dashed red;"> <p>some sample text. try inserting line breaks, or deleting text in differe...
...e sample text. try inserting line breaks, or deleting text in different ways, or pasting different content in.</p> <hr> <ul> <li>a sample</li> <li>bulleted</li> <li>list.</li> </ul> <p>another paragraph.</p> </div> javascript const log = document.getelementbyid('log'); const editable = document.queryselector('div[contenteditable]'); editable.addeventlistener('input', loginputtype); function loginputtype(event) { log.textcontent = `input type: ${event.inputtype}`; } result try editing the text inside the <div> and see what happens. note: see also masayuki nakano's inputevent test suite for a more detailed example. specifications specification status comment ui eventsthe definition of 'inputtype' in that specification. working draft ...

MimeType - Web APIs
the mimetype interface provides contains information about a mime type associated with a particular plugin. navigatorplugins.mimetypes returns an array of this object. properties mimetype.type returns the mime type of the associated plugin. mimetype.description returns a description of the associated plugin or an empty string if there is none. mimetype.suffixes a string containing valid file extensions for the data displayed by the plugin, or an empty string if an extension is not valid for the particular module. for example, a browser's content decryption module may appear in the plugin list but support more file extensions than can be anticipated. it might therefore return an empty string. ...
... or an empty string if there is none. mimetype.suffixes a string containing valid file extensions for the data displayed by the plugin, or an empty string if an extension is not valid for the particular module. for example, a browser's content decryption module may appear in the plugin list but support more file extensions than can be anticipated. it might therefore return an empty string. mimetype.enabledplugin returns an instance of plugin containing information about the plugin itself. specifications specification status comment html living standardthe definition of 'mimetype' in that specification. living standard initial definition. ...

MimeTypeArray - Web APIs
the mimetypearray interface returns an array of mimetype instances, each of which contains information about a supported browser plugins. this object is returned by navigatorplugins.mimetypes. properties mimetypearray.length the number of items in the array. methods mimetypearray.item() returns the mimetype object with the specified index. mimetypearray.nameditem() returns the mimetype object with the specified name. example the following example tests whether a plugin is available for the application/pdf mime type and if so, which plugin that is. var mimetypes = navigator.mimetype; var flashplugin = mimetypes['video/x-flv']; if (typeof flashplugin === "undefined") { var vid = document.createelement('video'); // use vid.canplaytype() to test for a supported mime type. }...
... living standard initial definition. ...

NDEFRecord.recordType - Web APIs
the recordtype property ofthe ndefrecord interface is usvstring containing the ndef record type. syntax ndefrecord.recordtype value a usvstring which can be one of the following: "empty" represents a empty ndef record. "text" represents a text ndef record. "url" represents an uri ndef record. "smart-poster" represents a "smart poster" ndef record. "absolute-url" represents an absolute url ndef record. "mime" represents a mime type ndef record. "unknown" represents an unknown ndef record. local type name represents a local type name, frequently used to specify ndef record embedded within another record. external type name represents a custom record type name that can be creted by organizations themselves for custom needs. specifications specification ...
... ndef record. "unknown" represents an unknown ndef record. local type name represents a local type name, frequently used to specify ndef record embedded within another record. external type name represents a custom record type name that can be creted by organizations themselves for custom needs. specifications specification status comment web nfc, ndefrecord.recordtype draft initial definition. ...

NodeList.prototype.forEach() - Web APIs
on(currentvalue, currentindex, listobj) { console.log(currentvalue + ', ' + currentindex + ', ' + this); }, 'mythisarg' ); the above code results in the following: [object htmlparagraphelement], 0, mythisarg [object text], 1, mythisarg [object htmlspanelement], 2, mythisarg polyfill this polyfill adds compatibility to all browsers supporting es5: if (window.nodelist && !nodelist.prototype.foreach) { nodelist.prototype.foreach = function (callback, thisarg) { thisarg = thisarg || window; for (var i = 0; i < this.length; i++) { callback.call(thisarg, this[i], i, this); } }; } or if (window.nodelist && !nodelist.prototype.foreach) { nodelist.prototype.foreach = array.prototype.foreach; } the above behavior is how many browsers actuall...
... specifications specification status comment web idlthe definition of 'foreach' in that specification. candidate recommendation defines foreach on iterable declarations browser compatibility the compatibility table on this page is generated from structured data. ...

PerformanceNavigation.type - Web APIs
this interface of this property is deprecated in the navigation timing level 2 specification. please use the performancenavigationtiming interface instead. the legacy performancenavigation.type read-only property returns an unsigned short containing a constant describing how the navigation to this page was done. possible values are: value constant name meaning 0 type_navigate the page was accessed by following a link, a bookmark, a form submission, a script, or typing the url in the address bar. 1 type_reload the page was accessed by clicking the reload button or via the location.reload() method. 2 type_back_forward the page was accessed by navigating into the history. 255 type_reserved any other way. sy...
...gate the page was accessed by following a link, a bookmark, a form submission, a script, or typing the url in the address bar. 1 type_reload the page was accessed by clicking the reload button or via the location.reload() method. 2 type_back_forward the page was accessed by navigating into the history. 255 type_reserved any other way. syntax type = performancenavigation.type; specifications specification status comment navigation timingthe definition of 'performancenavigation.type' in that specification. recommendation initial definition. ...

RTCIceCandidateType - Web APIs
host the candidate is a host candidate, whose ip address as specified in the rtcicecandidate.ip property is in fact the true address of the remote peer. srflx the candidate is a server reflexive candidate; the ip indicates an intermediary address assigned by the stun server to represent the candidate's peer anonymously. ...
...peer anonymously. prflx the candidate is a peer reflexive candidate; the ip is an intermediary address assigned by the stun server to represent the candidate's peer anonymously. relay the candidate is a relay candidate, obtained from a turn server. the relay candidate's ip address is an address the turn server uses to forward the media between the two peers. usage notes the rtcicecandidatetype enumeration is used by the type property of rtcicecandidate objects, as well as when reporting statistics on candidates using rtcicecandidatestats.candidatetype. specifications specification status comment webrtc 1.0: real-time communication between browsersthe definition of 'rtcicecandidatetype' in that specification. candidate recommendation initial definition. ...

RTCIceCredentialType - Web APIs
values oauth the rtciceserver requires the use of oauth 2.0 to authenticate in order to use the ice server described. this process is detailed in rfc 7635. this property was formerly called token. password the rtciceserver requires a username and password to authenticate prior to using the described ice server. obsolete values the following values are no longer part of the webrtc specification, but were in the past. token authenticating with the ice server requires the use of an oauth 2.0 token as defined in rfc 7635. this value has been renamed to oauth. ...
... the following values are no longer part of the webrtc specification, but were in the past. token authenticating with the ice server requires the use of an oauth 2.0 token as defined in rfc 7635. this value has been renamed to oauth. specifications specification status comment webrtc 1.0: real-time communication between browsersthe definition of 'rtcicecredentialtype' in that specification. candidate recommendation initial specification. ...

Selection.type - Web APIs
the type read-only property of the selection interface returns a domstring describing the type of the current selection. syntax value = sel.type value a domstring describing the type of the current selection. possible values are: none: no selection has currently been made. caret: the selection is collapsed (i.e. the caret is placed on some text, but no range has been selected). range: a range has been selected. example in this example, the event handler will fire each time a new selection is made. console.log(selection.type) will return caret or range depending on whether the caret is placed at a single point in the text, or a range has been selected. var selection; document.onselectionchange = function() { console.log('new selection made'); selection = document.g...
...le in this example, the event handler will fire each time a new selection is made. console.log(selection.type) will return caret or range depending on whether the caret is placed at a single point in the text, or a range has been selected. var selection; document.onselectionchange = function() { console.log('new selection made'); selection = document.getselection(); console.log(selection.type); }; specifications specification status comment selection apithe definition of 'selection.type' in that specification. working draft current ...

SourceBuffer.changeType() - Web APIs
the changetype() method of the sourcebuffer interface sets the mime type that future calls to appendbuffer() should expect the new media data to conform to. this makes it possible to change codecs or container type mid-stream. one scenario in which this is helpful is to support adapting the media source to changing bandwidth availability, by transitioning from one codec to another as resource constraints change. syntax sourcebuffer.changetype(type); parameters type a domstring specifying the mime type that future buffers will conform to. return value undefined. exceptions typeerror the specified string is empty, rather than indicating a valid mime type. invalidstateerror the sourcebuffer is not a member of the parent media source's sourcebuffers list, or the buffe...
...onform to. return value undefined. exceptions typeerror the specified string is empty, rather than indicating a valid mime type. invalidstateerror the sourcebuffer is not a member of the parent media source's sourcebuffers list, or the buffer's updating property indicates that a previously queued appendbuffer() or remove() is still being processed. notsupportederror the specified mime type is not supported, or is not supported with the types of sourcebuffer objects present in the mediasource.sourcebuffers list. usage notes if the parent mediasource is in its "ended" readystate, calling changetype() will transition the media source to the "open" readystate and fire a simple event named sourceopen at the parent media source. ...

TextEncoder.prototype.encode() - Web APIs
syntax b1 = encoder.encode(string); parameters string is a usvstring containing the text to encode. return value a uint8array object. ...
... living standard initial definition. ...

WakeLockSentinel.type - Web APIs
the read-only type property of the wakelocksentinel interface returns a string representation of the currently acquired wakelocksentinel type. syntax var type = wakelocksentinel.type; value a string representation of the currently acquired wake lock type. type read only return values are: 'screen': a screen wake lock. prevents devices from dimming or locking the screen. examples this example shows an asynchronous function that acquires a wakelocksentinel, then logs the type to the console. ...
...red wake lock type. type read only return values are: 'screen': a screen wake lock. prevents devices from dimming or locking the screen. examples this example shows an asynchronous function that acquires a wakelocksentinel, then logs the type to the console. const requestwakelock = async () => { wakelock = await navigator.wakelock.request('screen'); console.log(wakelock.type); // logs 'screen' }; requestwakelock(); specifications specification status comment screen wake lock apithe definition of 'wakelocktype' in that specification. unknown initial definition. ...

:only-of-type - CSS: Cascading Style Sheets
the :only-of-type css pseudo-class represents an element that has no siblings of the same type. /* selects each <p>, but only if it is the */ /* only <p> element inside its parent */ p:only-of-type { background-color: lime; } note: as originally defined, the selected element had to have a parent. beginning with selectors level 4, this is no longer required. syntax :only-of-type examples styling elements with no siblings of the same type html <main> <div>i am `div` #1.</div> <p>i am the only `p` among my siblings.</p> <div>i am `div` #2.</div> <div>i am `div` #3. ...
...selectors level 4, this is no longer required. syntax :only-of-type examples styling elements with no siblings of the same type html <main> <div>i am `div` #1.</div> <p>i am the only `p` among my siblings.</p> <div>i am `div` #2.</div> <div>i am `div` #3. <i>i am the only `i` child.</i> <em>i am `em` #1.</em> <em>i am `em` #2.</em> </div> </main> css main :only-of-type { color: red; } result specifications specification status comment selectors level 4the definition of ':only-of-type' in that specification. working draft matching elements are not required to have a parent. selectors level 3the definition of ':only-of-type' in that specification. recommendation initial definition. ...

Type selectors - CSS: Cascading Style Sheets
the css type selector matches elements by node name. in other words, it selects all elements of the given type within a document. /* all <a> elements. */ a { color: red; } syntax element { style properties } examples css span { background-color: skyblue; } html <span>here's a span with some text.</span> <p>here's a p with some text.</p> <span>here's a span with more text.</span> result specifications specification status comment selectors level 4the definition of 'type (tag name) selector' in that specification. working draft no changes selectors level 3the definition of 'type selectors' in that specification. ...
... a span with more text.</span> result specifications specification status comment selectors level 4the definition of 'type (tag name) selector' in that specification. working draft no changes selectors level 3the definition of 'type selectors' in that specification. recommendation no changes css level 2 (revision 1)the definition of 'type selectors' in that specification. recommendation css level 1the definition of 'type selectors' in that specification. recommendation initial definition ...

TypeError: can't access property "x" of "y" - JavaScript
the javascript exception "can't access property" occurs when property access was operated on undefined or null values. message typeerror: unable to get property {x} of undefined or null reference (edge) typeerror: can't access property {x} of {y} (firefox) typeerror: {y} is undefined, can't access property {x} of it (firefox) typeerror: {y} is null, can't access property {x} of it (firefox) examples: typeerror: x is undefined, can't access property "prop" of it typeerror: x is null, can't access property "prop" of it typeerror: can't access property "prop" of undefined typeerror: can't access property "prop" of null error type typeerror. what went wrong? the property access was operated on undefined or null value. examples invalid cases // undefined and null cases on which the subs...
...typeerror: x is null, can't access property "prop" of it typeerror: can't access property "prop" of undefined typeerror: can't access property "prop" of null error type typeerror. what went wrong? the property access was operated on undefined or null value. examples invalid cases // undefined and null cases on which the substring method won't work var foo = undefined; foo.substring(1); // typeerror: x is undefined, can't access property "substring" of it var foo = null; foo.substring(1); // typeerror: x is null, can't access property "substring" of it fixing the issue to fix null pointer to undefined or null values, you can use the typeof operator, for example. if (typeof foo !== 'undefined') { // now we know that foo is defined, we are good to go. } ...

TypeError: can't assign to property "x" on "y": not an object - JavaScript
the javascript strict mode exception "can't assign to property" occurs when attempting to create a property on primitive value such as a symbol, a string, a number or a boolean. primitive values cannot hold any property. message typeerror: can't assign to property "x" on {y}: not an object (firefox) typeerror: cannot create property 'x' on {y} (chrome) error type typeerror. what went wrong? in strict_mode, a typeerror is raised when attempting to create a property on primitive value such as a symbol, a string, a number or a boolean. primitive values cannot hold any property. the problem might be that an unexpected value is flowing at an unexpected place, or that an object variant of a string or a number is expected. examples invalid cases 'use strict'; var foo = "my string"; // th...
...ty on primitive value such as a symbol, a string, a number or a boolean. primitive values cannot hold any property. the problem might be that an unexpected value is flowing at an unexpected place, or that an object variant of a string or a number is expected. examples invalid cases 'use strict'; var foo = "my string"; // the following line does nothing if not in strict mode. foo.bar = {}; // typeerror: can't assign to property "bar" on "my string": not an object fixing the issue either fix the code to prevent the primitive from being used in such places, or fix the issue is to create the object equivalent object. 'use strict'; var foo = new string("my string"); foo.bar = {}; ...