Introduction - JavaScript
« previousnext » this chapter introduces javascript and discusses some of its fundamental concepts.
...javascript and discusses some of its fundamental concepts.
...e of its fundamental concepts.
...And 61 more matches

Details of the object model - JavaScript
« previousnext » javascript is an object-based language based on prototypes, rather than being class-based.
... « previousnext » javascript is an object-based language based on prototypes, rather than being class-based.
... « previousnext » javascript is an object-based language based on prototypes, rather than being class-based.
...And 55 more matches

JavaScript
javascript (js) is a lightweight, interpreted, or just-in-time compiled programming language with first-class functions.
... javascript (js) is a lightweight, interpreted, or just-in-time compiled programming language with first-class functions.
...mming language with first-class functions.
...And 48 more matches

Back to the Server: Server-Side JavaScript On The Rise - Archive of obsolete content
by davey waterson, javascript architect, aptana there's no debate that javascript is the most widely used language client-side on the web.
... by davey waterson, javascript architect, aptana there's no debate that javascript is the most widely used language client-side on the web.
... by davey waterson, javascript architect, aptana there's no debate that javascript is the most widely used language client-side on the web.
...And 46 more matches

Avoiding leaks in JavaScript XPCOM components
article was written.
... to be updated to reflect the changes and the cases where they help.
...e memory management issues are not obvious.
...And 39 more matches

Introduction to the JavaScript shell
the javascript shell (js) is a command-line program included in the spidermonkey source distribution.
... the javascript shell (js) is a command-line program included in the spidermonkey source distribution.
... the javascript shell (js) is a command-line program included in the spidermonkey source distribution.
...And 34 more matches

Grammar and types - JavaScript
« previousnext » this chapter discusses javascript's basic grammar, variable declarations, data types and literals.
... « previousnext » this chapter discusses javascript's basic grammar, variable declarations, data types and literals.
... « previousnext » this chapter discusses javascript's basic grammar, variable declarations, data types and literals.
...And 31 more matches

JavaScript basics - Learn web development
previous overview: getting started with the web next javascript is a programming language that adds interactivity to your website.
... previous overview: getting started with the web next javascript is a programming language that adds interactivity to your website.
...previous overview: getting started with the web next javascript is a programming language that adds interactivity to your website.
...And 30 more matches

CSS and JavaScript accessibility best practices - Learn web development
previous overview: accessibility next css and javascript, when used properly, also have the potential to allow for accessible web experiences ...
... previous overview: accessibility next css and javascript, when used properly, also have the potential to allow for accessible web experiences ...
...d javascript, when used properly, also have the potential to allow for accessible web experiences ...
...And 29 more matches

Use JavaScript within a webpage - Learn web development
take your webpages to the next level by harnessing javascript.
... take your webpages to the next level by harnessing javascript.
... take your webpages to the next level by harnessing javascript.
...And 29 more matches

Basic math in JavaScript — numbers and operators - Learn web development
previous overview: first steps next at this point in the course we discuss math in javascript — how we can use operators and other features to successfully manipulate numbers to do our bidding.
... previous overview: first steps next at this point in the course we discuss math in javascript — how we can use operators and other features to successfully manipulate numbers to do our bidding.
...vious overview: first steps next at this point in the course we discuss math in javascript — how we can use operators and other features to successfully manipulate numbers to do our bidding.
...And 24 more matches

A first splash into JavaScript - Learn web development
previous overview: first steps next now you've learned something about the theory of javascript, and what you can do with it, we are going to give you a crash course in the basic features of javascript via a completely practical tutorial.
...s next now you've learned something about the theory of javascript, and what you can do with it, we are going to give you a crash course in the basic features of javascript via a completely practical tutorial.
... do with it, we are going to give you a crash course in the basic features of javascript via a completely practical tutorial.
...And 23 more matches

JavaScript — Dynamic client-side scripting - Learn web development
javascript is a programming language that allows you to implement complex things on web pages.
... javascript is a programming language that allows you to implement complex things on web pages.
...isplay static information for you to look at—displaying timely content updates, interactive maps, animated 2d/3d graphics, scrolling video jukeboxes, or more—you can bet that javascript is probably involved.
...And 22 more matches

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).
... 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).
...).
...And 22 more matches

Strict mode - JavaScript
sometimes you'll see the default, non-strict mode referred to as "sloppy mode".
... sometimes you'll see the default, non-strict mode referred to as "sloppy mode".
...erent semantics from normal code.
...And 22 more matches

Solve common problems in your JavaScript code - Learn web development
the following links point to solutions to common problems you may encounter when writing javascript.
... the following statement: myfunction(); function scope remember that functions have their own scope — you can't access a variable value set inside a function from outside the function, unless you declared the variable globally (i.e.
... return from a function, the javascript interpreter exits the function — no code after the return statement will run.
...And 20 more matches

JavaScript Daemons Management - Archive of obsolete content
in computer science a daemon is a task that runs as a background process, rather than being under the direct control of an interactive user.
... in computer science a daemon is a task that runs as a background process, rather than being under the direct control of an interactive user.
...n the recommended way for simple animations, because daemon without its collection of methods is essentially a clone of it.
...And 19 more matches

JavaScript - MDN Web Docs Glossary: Definitions of Web-related terms
summary javascript (or "js") is a programming language used most often for dynamic client-side scripts on webpages, but it is also often used on the server-side, using a runtime such as node.js.
... summary javascript (or "js") is a programming language used most often for dynamic client-side scripts on webpages, but it is also often used on the server-side, using a runtime such as node.js.
... summary javascript (or "js") is a programming language used most often for dynamic client-side scripts on webpages, but it is also often used on the server-side, using a runtime such as node.js.
...And 19 more matches

New in JavaScript 1.3 - Archive of obsolete content
the following is a changelog for javascript from netscape navigator 4.0 to 4.5.
... the following is a changelog for javascript from netscape navigator 4.0 to 4.5.
... the following is a changelog for javascript from netscape navigator 4.0 to 4.5.
...And 18 more matches

In depth: Microtasks and the JavaScript runtime environment - Web APIs
when debugging or, possibly, when trying to decide upon the best approach to solving a problem around timing and scheduling of tasks and microtasks, there are things about how the javascript runtime operates under the hood that may be useful to understand.
... when debugging or, possibly, when trying to decide upon the best approach to solving a problem around timing and scheduling of tasks and microtasks, there are things about how the javascript runtime operates under the hood that may be useful to understand.
...re are things about how the javascript runtime operates under the hood that may be useful to understand.
...And 18 more matches

JavaScript First Steps - Learn web development
in our first javascript module, we first answer some fundamental questions such as "what is javascript?", "what does it look like?", and "what can it do?", before moving on to taking you through your first practical experience of writing javascript.
...st practical experience of writing javascript.
...s.
...And 17 more matches

Inheritance in JavaScript - Learn web development
ils of oojs now explained, this article shows how to create "child" object classes (constructors) that inherit features from their "parent" classes.
... when and where you might use oojs, and look at how classes are dealt with in modern ecmascript syntax.
...and oojs basics (see introduction to objects).
...And 17 more matches

Introducing JavaScript objects - Learn web development
in javascript, most things are objects, from core javascript features like arrays to the browser apis built on top of javascript.
... in javascript, most things are objects, from core javascript features like arrays to the browser apis built on top of javascript.
...eate your own objects.
...And 17 more matches

New in JavaScript - Archive of obsolete content
this chapter contains information about javascript's version history and implementation status for mozilla/spidermonkey-based javascript applications, such as firefox.
... this chapter contains information about javascript's version history and implementation status for mozilla/spidermonkey-based javascript applications, such as firefox.
...tus for the current standard ecma-262 edition 5.1 in mozilla-based engines and products.
...And 16 more matches

Using JavaScript code modules
javascript code modules are a concept introduced in gecko 1.9 and can be used for sharing code between different privileged scopes.
... javascript code modules are a concept introduced in gecko 1.9 and can be used for sharing code between different privileged scopes.
... javascript code modules are a concept introduced in gecko 1.9 and can be used for sharing code between different privileged scopes.
...And 16 more matches

Working with objects - JavaScript
« previousnext » javascript is designed on a simple object-based paradigm.
...ties, and a property is an association between a name (or key) and a value.
...ase the property is known as a method.
...And 16 more matches

Using the WebAssembly JavaScript API - WebAssembly
if you have already compiled a module from another language using tools like emscripten, or loaded and run the code yourself, the next step is to learn more about using the other features of the webassembly javascript api.
...next step is to learn more about using the other features of the webassembly javascript api.
...sm module (which we also meet in converting webassembly format to wasm): (module (func $i (import "imports" "imported_func") (param i32)) (func (export "exported_func") i32.const 42 call $i)) in the second line, you will see that the import has a two-level namespace — the internal function $i is imported from imports.imported_func.
...And 16 more matches

Properly Using CSS and JavaScript in XHTML Documents - Archive of obsolete content
aw < and & characters are not allowed except inside of cdata sections (<![cdata[ ...
...sections (<![cdata[ ...
...ained within comments (<!—— ...
...And 15 more matches

JavaScript performance - Learn web development
previous overview: performance next while images and video account for over 70% of the bytes downloaded for the average website, byte per byte, javascript has a greater negative impact on performance.
... previous overview: performance next while images and video account for over 70% of the bytes downloaded for the average website, byte per byte, javascript has a greater negative impact on performance.
... per byte, javascript has a greater negative impact on performance.
...And 15 more matches

JavaScript object basics - Learn web development
overview: objects next in this article, we'll look at fundamental javascript object syntax, and revisit some javascript features that we've already seen earlier in the course, reiterating the fact that many of the features you've already dealt with are objects.
... overview: objects next in this article, we'll look at fundamental javascript object syntax, and revisit some javascript features that we've already seen earlier in the course, reiterating the fact that many of the features you've already dealt with are objects.
...e already seen earlier in the course, reiterating the fact that many of the features you've already dealt with are objects.
...And 14 more matches

eval() - JavaScript
warning: executing javascript from a string is an enormous security risk.
... warning: executing javascript from a string is an enormous security risk.
... see never use eval()!, below.
...And 14 more matches

Object-oriented JavaScript for beginners - Learn web development
previous overview: objects next with the basics out of the way, we'll now focus on object-oriented javascript (oojs) — this article presents a basic view of object-oriented programming (oop) theory, then explores how javascript emulates object classes via constructor functions, and how to create object instances.
...t with the basics out of the way, we'll now focus on object-oriented javascript (oojs) — this article presents a basic view of object-oriented programming (oop) theory, then explores how javascript emulates object classes via constructor functions, and how to create object instances.
...object classes via constructor functions, and how to create object instances.
...And 13 more matches

JavaScript Object Management - Archive of obsolete content
« previousnext » chrome javascript in this section we'll look into how to handle javascript data effectively, beginning with chrome code, in ways which will prevent pollution of shared namespaces and conflicts with other add-ons resulting from such global namespace pollution.
... « previousnext » chrome javascript in this section we'll look into how to handle javascript data effectively, beginning with chrome code, in ways which will prevent pollution of shared namespaces and conflicts with other add-ons resulting from such global namespace pollution.
... « previousnext » chrome javascript in this section we'll look into how to handle javascript data effectively, beginning with chrome code, in ways which will prevent pollution of shared namespaces and conflicts with other add-ons resulting from such global namespace pollution.
...And 12 more matches

Introducing asynchronous JavaScript - Learn web development
previous overview: asynchronous next in this article we briefly recap the problems associated with synchronous javascript, and take a first look at some of the different asynchronous techniques you'll encounter, showing how they can help us solve such problems.
... previous overview: asynchronous next in this article we briefly recap the problems associated with synchronous javascript, and take a first look at some of the different asynchronous techniques you'll encounter, showing how they can help us solve such problems.
... in this article we briefly recap the problems associated with synchronous javascript, and take a first look at some of the different asynchronous techniques you'll encounter, showing how they can help us solve such problems.
...And 12 more matches

Handling text — strings in JavaScript - Learn web development
previous overview: first steps next next, we'll turn our attention to strings — this is what pieces of text are called in programming.
...ntion to strings — this is what pieces of text are called in programming.
...cle, we'll look at all the common things that you really ought to know about strings when learning javascript, such as creating strings, escaping quotes in strings, and joining strings together.
...And 12 more matches

The JavaScript Runtime
erpretation beginning with rhino 1.4 release 2, an interpretive mode is supported.
...interpretive mode, an internal representation of the compiled form is created and stored rather than generating a java class.
...nd stored rather than generating a java class.
...And 12 more matches

Using microtasks in JavaScript with queueMicrotask() - Web APIs
a microtask is a short function which is executed after the function or program which created it exits and only if the javascript execution stack is empty, but before returning control to the event loop being used by the user agent to drive the script's execution environment.
...being used by the user agent to drive the script's execution environment.
...re are other times when the ability to defer work until the current event loop pass is wrapping up.
...And 12 more matches

New in JavaScript 1.8 - Archive of obsolete content
the following is a changelog for javascript 1.8.
... the following is a changelog for javascript 1.8.
... the following is a changelog for javascript 1.8.
...And 11 more matches

Control flow and error handling - JavaScript
« previousnext » javascript supports a compact set of statements, specifically control flow statements, that you can use to incorporate a great deal of interactivity in your application.
... « previousnext » javascript supports a compact set of statements, specifically control flow statements, that you can use to incorporate a great deal of interactivity in your application.
......
...And 11 more matches

Expressions and operators - JavaScript
« previousnext » this chapter describes javascript's expressions and operators, including assignment, comparison, arithmetic, bitwise, logical, string, ternary and more.
... « previousnext » this chapter describes javascript's expressions and operators, including assignment, comparison, arithmetic, bitwise, logical, string, ternary and more.
... is also available in the reference.
...And 11 more matches

Lexical grammar - JavaScript
this page describes javascript's lexical grammar.
...o-break space <nbsp> normal space, but no point at which a line may break others other unicode space characters <usp> spaces in unicode on wikipedia line terminators in addition to white space characters, line terminator characters are used to improve the readability of the source text.
... u+000a line feed <lf> new line character in unix systems.
...And 11 more matches

What went wrong? Troubleshooting JavaScript - Learn web development
previous overview: first steps next when you built up the "guess the number" game in the previous article, you may have found that it didn't work.
...you built up the "guess the number" game in the previous article, you may have found that it didn't work.
...o fix!
...And 10 more matches

JavaScript code modules
note: these are not the same thing as standard javascript modules.
... note: these are not the same thing as standard javascript modules.
... note: these are not the same thing as standard javascript modules.
...And 10 more matches

Memory Management - JavaScript
low-level languages like c, have manual memory management primitives such as malloc() and free().
...life cycle regardless of the programming language, the memory life cycle is pretty much always the same: allocate the memory you need use the allocated memory (read, write) release the allocated memory when it is not needed anymore the second part is explicit in all languages.
...he programming language, the memory life cycle is pretty much always the same: allocate the memory you need use the allocated memory (read, write) release the allocated memory when it is not needed anymore the second part is explicit in all languages.
...And 10 more matches

Downloading JSON and JavaScript in extensions - Archive of obsolete content
a common practice found in many extensions is using xmlhttprequest (or some other mechanism) to download javascript or json (they are different) from a remote website.
... a common practice found in many extensions is using xmlhttprequest (or some other mechanism) to download javascript or json (they are different) from a remote website.
...) to download javascript or json (they are different) from a remote website.
...And 9 more matches

Exception logging in JavaScript - Archive of obsolete content
in versions of firefox prior to firefox 3, all javascript exceptions were always logged into the error console if they remained unhandled at the time execution returned back into c++ code.
... in versions of firefox prior to firefox 3, all javascript exceptions were always logged into the error console if they remained unhandled at the time execution returned back into c++ code.
...re always logged into the error console if they remained unhandled at the time execution returned back into c++ code.
...And 9 more matches

New in JavaScript 1.1 - Archive of obsolete content
the following is a changelog for javascript from netscape navigator 2.0 to 3.0.
... the following is a changelog for javascript from netscape navigator 2.0 to 3.0.
... the following is a changelog for javascript from netscape navigator 2.0 to 3.0.
...And 9 more matches

Asynchronous JavaScript - Learn web development
in this module we take a look at asynchronous javascript, why it is important, and how it can be used to effectively handle potential blocking operations such as fetching resources from a server.
... in this module we take a look at asynchronous javascript, why it is important, and how it can be used to effectively handle potential blocking operations such as fetching resources from a server.
...rtant, and how it can be used to effectively handle potential blocking operations such as fetching resources from a server.
...And 9 more matches

SpiderMonkey: The Mozilla JavaScript runtime
spidermonkey is mozilla's javascript engine written in c and c++.
... spidermonkey is mozilla's javascript engine written in c and c++.
... in c and c++.
...And 9 more matches

Indexed collections - JavaScript
x value.
...n the object representing the array, instead of an array element.
...myarray = ['mango', 'apple', 'orange'] understanding length at the implementation level, javascript's arrays actually store their elements as standard object properties, using the array index as the property name.
...And 9 more matches

JavaScript timers - Archive of obsolete content
a block of javascript code is generally executed synchronously.
... a block of javascript code is generally executed synchronously.
...ween each call to that function.
...And 8 more matches

New in JavaScript 1.2 - Archive of obsolete content
the following is a changelog for javascript from netscape navigator 3.0 to 4.0.
... the following is a changelog for javascript from netscape navigator 3.0 to 4.0.
... the following is a changelog for javascript from netscape navigator 3.0 to 4.0.
...And 8 more matches

Functions - JavaScript
« previousnext » functions are one of the fundamental building blocks in javascript.
... « previousnext » functions are one of the fundamental building blocks in javascript.
... similar to a procedure—a set of statements that performs a task or calculates a value, but for a procedure to qualify as a function, it should take some input and return an output where there is some obvious relationship between the input and the output.
...And 8 more matches

New in JavaScript 1.7 - Archive of obsolete content
the following is a changelog for javascript 1.7.
... the following is a changelog for javascript 1.7.
... the following is a changelog for javascript 1.7.
...And 7 more matches

Server-Side JavaScript - Archive of obsolete content
es already use, every day.
....
...ver was part of netscape's original vision back in the day with netscape livewire.
...And 7 more matches

Writing JavaScript for XHTML - Archive of obsolete content
g browser considers the content to be html, and does not utilise its xml parser.
...dia type at all.
...sometimes known as 'polyglot' documents.) to test the following examples locally, use firefox's extension switch.
...And 7 more matches

Creating JavaScript callbacks in components
callback patterns in idl xpcom components use idl to create interfaces.
...ler = { onword : function(word) { alert(word); } }; var stringparser = /* get a reference to the parser somehow */ stringparser.addobserver(wordhandler); stringparser.parse("pay no attention to the man behind the curtain"); you can find examples of this pattern all over the mozilla codebase.
...rse("pay no attention to the man behind the curtain"); you can find examples of this pattern all over the mozilla codebase.
...And 7 more matches

Array - JavaScript
the javascript array class is a global object that is used in the construction of arrays; which are high-level, list-like objects.
... the javascript array class is a global object that is used in the construction of arrays; which are high-level, list-like objects.
...ct that is used in the construction of arrays; which are high-level, list-like objects.
...And 7 more matches

Archived JavaScript Reference - Archive of obsolete content
obsolete javascript features and unmaintained docs arguments.callerthe obsolete arguments.caller property used to provide the function that invoked the currently executing function.
... obsolete javascript features and unmaintained docs arguments.callerthe obsolete arguments.caller property used to provide the function that invoked the currently executing function.
...iable over all values of object's properties.
...And 6 more matches

Cooperative asynchronous JavaScript: Timeouts and intervals - Learn web development
previous overview: asynchronous next this tutorial looks at the traditional methods javascript has available for running code asychronously after a set time period has elapsed, or at a regular interval (e.g.
...ious overview: asynchronous next this tutorial looks at the traditional methods javascript has available for running code asychronously after a set time period has elapsed, or at a regular interval (e.g.
...r interval (e.g.
...And 6 more matches

Intensive JavaScript - Firefox Developer Tools
by default the browser uses a single thread to run all the javascript in your page as well as to perform layout, reflows, and garbage collection.
... by default the browser uses a single thread to run all the javascript in your page as well as to perform layout, reflows, and garbage collection.
... by default the browser uses a single thread to run all the javascript in your page as well as to perform layout, reflows, and garbage collection.
...And 6 more matches

JSON - JavaScript
the json object contains methods for parsing javascript object notation (json) and converting values to json.
... the json object contains methods for parsing javascript object notation (json) and converting values to json.
... the json object contains methods for parsing javascript object notation (json) and converting values to json.
...And 6 more matches

Rhino JavaScript compiler
overview the javascript compiler translates javascript source into java class files.
... overview the javascript compiler translates javascript source into java class files.
...cript source into java class files.
...And 5 more matches

How to build an XPCOM component in JavaScript
if you are looking for add-on sdk solution for xpcom javascript components then check out platform/xpcom module first.
... if you are looking for add-on sdk solution for xpcom javascript components then check out platform/xpcom module first.
...l will show you what you need to do to get a component working in as few and as simple steps as possible.
...And 5 more matches

Numbers and dates - JavaScript
« previousnext » this chapter introduces the concepts, objects and functions used to work with and perform calculations using numbers and dates in javascript.
... « previousnext » this chapter introduces the concepts, objects and functions used to work with and perform calculations using numbers and dates in javascript.
...recision 64-bit binary format ieee 754 (i.e., a number between ±2−1022 and ±2+1023, or about ±10−308 to ±10+308, with a numeric precision of 53 bits).
...And 5 more matches

Functions - JavaScript
generally speaking, a function is a "subprogram" that can be called by code external (or internal in the case of recursion) to the function.
...f statements called the function body.
...unction, and the function will return a value.
...And 5 more matches

FinalizationRegistry - JavaScript
d.
...c behaviors not guaranteed by the specification.
...xpected, or not at all.
...And 5 more matches

WeakRef - JavaScript
rom getting garbage-collected.
...f() returns the weakref object's target object, or undefined if the target object has been reclaimed.
...c behaviors not guaranteed by the specification.
...And 5 more matches

Destructuring assignment - JavaScript
the destructuring assignment syntax is a javascript expression that makes it possible to unpack values from arrays, or properties from objects, into distinct variables.
...string that matched each parenthesized group in the regular expression.
...ession.
...And 5 more matches

Sending forms through JavaScript - Learn web development
html forms can send an http request declaratively.
... issues like flickering.
...alone formdata object.
...And 4 more matches

JavaScript building blocks - Learn web development
in this module, we continue our coverage of all javascript's key fundamental features, turning our attention to commonly-encountered types of code blocks such as conditional statements, loops, functions, and events.
...ly in passing — here we'll discuss it all explicitly.
...ls in any programming language, code needs to make decisions and carry out actions accordingly depending on different inputs.
...And 4 more matches

Debugging JavaScript
this document is intended to help developers writing javascript code in mozilla, mainly for mozilla itself, but it may also be useful for web developers.
... is intended to help developers writing javascript code in mozilla, mainly for mozilla itself, but it may also be useful for web developers.
...rs.
...And 4 more matches

Closures - JavaScript
a closure is the combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment).
...xecuted.
...tuitive that this code still works.
...And 4 more matches

JSON.stringify() - JavaScript
the json.stringify() method converts a javascript object or value to a json string, optionally replacing values if a replacer function is specified or optionally including only the specified properties if a replacer array is specified.
...rializing circular references throws "typeerror: cyclic object value" json.stringify(circularreference); to serialize circular references you can use a library that supports them (e.g.
... json.stringify(circularreference); to serialize circular references you can use a library that supports them (e.g.
...And 4 more matches

CSS and JavaScript animation performance - Web Performance
animations are critical for a pleasurable user experience on many applications.
... animations are critical for a pleasurable user experience on many applications.
...ion's style, as well as possible intermediate points.
...And 4 more matches

New in JavaScript 1.8.1 - Archive of obsolete content
the following is a changelog for javascript 1.8.1.
... the following is a changelog for javascript 1.8.1.
... the following is a changelog for javascript 1.8.1.
...And 3 more matches

Understanding client-side JavaScript frameworks - Learn web development
javascript frameworks are an essential part of modern front-end web development, providing developers with tried and tested tools for building scalable, interactive web applications.
... want to back up and first answer more fundamental questions such as: why should i use a framework?
... want you to go forward and learn about frameworks in a pragmatic way that doesn't forget about web platform fundamental best practices such as accessibility.
...And 3 more matches

javascript.options.strict
javascript warnings are generated when code is executed that doesn't cause a run-time error, but is non-standard, poorly written, or prone to cause logic errors.
... javascript warnings are generated when code is executed that doesn't cause a run-time error, but is non-standard, poorly written, or prone to cause logic errors.
... javascript warnings are generated when code is executed that doesn't cause a run-time error, but is non-standard, poorly written, or prone to cause logic errors.
...And 3 more matches

Creating JavaScript jstest reftests
directory contains tests of spidermonkey conformance to ecmascript as well as spidermonkey non-standard extenstions to ecmascript.
...nical committee.
...ng exceptions, and the matching is fuzzy in an unspecified way.
...And 3 more matches

The JavaScript input interpreter - Firefox Developer Tools
you can interpret javascript expressions in real time using the interpreter provided by the web console.
... you can interpret javascript expressions in real time using the interpreter provided by the web console.
... execute the input, but behaves as if you had pressed shift+enter , so you can finish entering the function definition.
...And 3 more matches

Traversing an HTML table with JavaScript and DOM Interfaces - Web APIs
introduction this article is an overview of some powerful, fundamental dom level 1 methods and how to use them from javascript.
....
... its parent <table> element using tbl.appendchild(tblbody); next, we attach the <table> element to its parent <body> element using body.appendchild(tbl); remember this technique.
...And 3 more matches

Loops and iteration - JavaScript
« previousnext » loops offer a quick and easy way to do something repeatedly.
... « previousnext » loops offer a quick and easy way to do something repeatedly.
...different kinds of loops, but they all essentially do the same thing: they repeat an action some number of times.
...And 3 more matches

Regular expressions - JavaScript
« previousnext » regular expressions are patterns used to match character combinations in strings.
... « previousnext » regular expressions are patterns used to match character combinations in strings.
...add them using string.replace: function escaperegexp(string) { return string.replace(/[.*+\-?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string } the "g" after the regular expression is an option or flag that performs a global search, looking in the whole string and returning all matches.
...And 3 more matches

Warning: -file- is being assigned a //# sourceMappingURL, but already has one - JavaScript
the javascript warning "-file- is being assigned a //# sourcemappingurl, but already has one." occurs when a source map has been specified more than once for a given javascript source.
... the javascript warning "-file- is being assigned a //# sourcemappingurl, but already has one." occurs when a source map has been specified more than once for a given javascript source.
... warning "-file- is being assigned a //# sourcemappingurl, but already has one." occurs when a source map has been specified more than once for a given javascript source.
...And 3 more matches

SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead - JavaScript
the javascript warning "using //@ to indicate sourceurl pragmas is deprecated.
... the javascript warning "using //@ to indicate sourceurl pragmas is deprecated.
... //@ to indicate sourceurl pragmas is deprecated.
...And 3 more matches

SyntaxError: missing ; before statement - JavaScript
the javascript exception "missing ; before statement" occurs when there is a semicolon (;) missing somewhere and can't be added by automatic semicolon insertion (asi).
... the javascript exception "missing ; before statement" occurs when there is a semicolon (;) missing somewhere and can't be added by automatic semicolon insertion (asi).
...re statement" occurs when there is a semicolon (;) missing somewhere and can't be added by automatic semicolon insertion (asi).
...And 3 more matches

JavaScript Client API - Archive of obsolete content
overview this page describes how to use the internal client-side sync javascript api.
... people should always know with whom they are dealing and where the information or software they are downloading came from).
...is produced or endorsed by mozilla.
...And 2 more matches

New in JavaScript 1.5 - Archive of obsolete content
the following is a changelog for javascript 1.5.
... the following is a changelog for javascript 1.5.
...a changelog for javascript 1.5.
...And 2 more matches

2D breakout game using pure JavaScript - Game development
next » in this step-by-step tutorial we create a simple mdn breakout game written entirely in pure javascript and rendered on html5 <canvas>.
...able, live samples available to play with so you can see what the intermediate stages should look like.
...wn simple web games.
...And 2 more matches

Building a Thunderbird extension 6: Adding JavaScript
warning: this content is for older versions of thunderbird.
...derbird.
...er be relevant.
...And 2 more matches

Text formatting - JavaScript
« previousnext » this chapter introduces how to work with strings and text in javascript.
... « previousnext » this chapter introduces how to work with strings and text in javascript.
...ototype.codepointat().
...And 2 more matches

Deprecated and obsolete features - JavaScript
this page lists features of javascript that are deprecated (that is, still available but planned for removal) and obsolete (that is, no longer usable).
...ch, and string.prototype.replace are deprecated.
...ubstr probably won't be removed anytime soon, but it's defined in annex b of the ecma-262 standard, whose introduction states: "… programmers should not use or assume the existence of these features and behaviours when writing new ecmascript code.
...And 2 more matches

JSON.parse() - JavaScript
the json.parse() method parses a json string, constructing the javascript value or object described by the string.
...var rx_three = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[ee][+\-]?\d+)?/g; var rx_four = /(?:^|:|,)(?:\s*\[)+/g; var rx_dangerous = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g; json.parse = function(text, reviver) { // the parse method takes a text and an optional reviver function, and returns // a javascript value if the text is a valid json text.
... value[k] = v; } else { delete value[k]; } } } } return reviver.call(holder, key, value); } // parsing happens in four stages.
...And 2 more matches

Number - JavaScript
number is a primitive wrapper object used to represent and manipulate numbers like 37 or -9.25.
...format ieee 754 value, like double in java or c#.
...mits to what it can store.
...And 2 more matches

WebAssembly.Table - JavaScript
the webassembly.table() object is a javascript wrapper object — an array-like structure representing a webassembly table, which stores function references.
... the webassembly.table() object is a javascript wrapper object — an array-like structure representing a webassembly table, which stores function references.
... the webassembly.table() object is a javascript wrapper object — an array-like structure representing a webassembly table, which stores function references.
...And 2 more matches

isNaN() - JavaScript
s whether a value is nan or not.
... // true: "blabla" is converted to a number.
...is as a number fails and returns nan useful special-case behavior there is a more usage oriented way to think of isnan(): if isnan(x) returns false, you can use x in an arithmetic expression not making the expression return nan.
...And 2 more matches

typeof - JavaScript
b.com/mdn/interactive-examples and send us a pull request.
...ar expressions section for historical results // the following are confusing, dangerous, and wasteful.
...confusing, dangerous, and wasteful.
...And 2 more matches

void operator - JavaScript
efined examples immediately invoked function expressions when using an immediately-invoked function expression, void can be used to force the function keyword to be treated as an expression instead of a declaration.
...ction expressions when using an immediately-invoked function expression, void can be used to force the function keyword to be treated as an expression instead of a declaration.
...}(); // output: "executed!" executing the above function without the void keyword will result in an uncaught syntaxerror.
...And 2 more matches

JavaScript Debugger Service - Archive of obsolete content
obsolete since gecko 33 (firefox 33 / thunderbird 33 / seamonkey 2.30) this feature is obsolete.
...3 (firefox 33 / thunderbird 33 / seamonkey 2.30) this feature is obsolete.
...e } }; // triggered when jsd.errorhook[onerror] returns false jsd.debughook = { onexecute: function(frame, type, rv) { // your function here } }; jsd.enumeratescripts({ // the enumeratescript method will be called once for every script jsd knows about enumeratescript: function(script) { // your function here } }); a simple stack trace here, we will show how to implement a simple javascript stack trace using the jsd.
...ist.

Drag and Drop JavaScript Wrapper - Archive of obsolete content
« previousnext » gecko 1.9.1 (firefox 3.5) and later supports a newer and simpler api.
... « previousnext » gecko 1.9.1 (firefox 3.5) and later supports a newer and simpler api.
... « previousnext » gecko 1.9.1 (firefox 3.5) and later supports a newer and simpler api.
...ferdata, action) { var htmltext = "<strong>cabbage</strong>"; var plaintext = "cabbage"; transferdata.data = new transferdata(); transferdata.data.adddataforflavour("text/html",htmltext); transferdata.data.adddataforflavour("text/unicode",plaintext); } } here, an observer has been declared and stored in the variable textobserver.

New in JavaScript 1.6 - Archive of obsolete content
the following is a changelog for javascript 1.6.
... the following is a changelog for javascript 1.6.
... in firefox 1.5 (gecko 1.8), which was released in november 2005.
...cript 1.6 support for ecmascript for xml (e4x) for creating and processing xml content within javascript has been added.

New in JavaScript 1.8.5 - Archive of obsolete content
the following is a changelog for javascript 1.8.5.
... the following is a changelog for javascript 1.8.5.
...ntax has not been changed.
... affects you, see this blog post for details.

Test your skills: CSS and JavaScript accessibility - Learn web development
this aim of this skill test is to assess whether you've understood our css and javascript accessibility best practices article.
...font-size that fix the problem.
...values to fix the problem.
...ditor.

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.
... of this let's look at an html image element in a document.
...to__ | htmlelement.prototype | |.__proto__ | element.prototype | |.__proto__ | node.prototype | |.__proto__ | object.prototype | |.__proto__ | null if you have an instance of a htmldivelement in javascript, the following will hold true: div.__proto__ === htmldivelement.prototype which means that the following should also be true: div.__proto__ === div.constructor.prototype non standard no browser is required to provide modifiable __proto__, nor a global node, nor provide any way to get at host objects nor their associated prototypes.
...ame htmlimageelement earlier, the recursion will stop right there.

JavaScript Tips
e if it succeeds.
...nstanceof to cache all its known interfaces.
...e c++ method access a c++ object.
...ings; these vary from element to element.

AudioContext.createJavaScriptNode() - Web APIs
the audiocontext.createjavascriptnode() method creates a javascriptnode which is used for directly manipulating audio data with javascript.
... the audiocontext.createjavascriptnode() method creates a javascriptnode which is used for directly manipulating audio data with javascript.
...., one of: 256, 512, 1024, 2048, 4096, 8192, or 16384.
...gher for better overall quality.

Keyboard-navigable JavaScript widgets - Accessibility
overview web applications often use javascript to mimic desktop widgets such as menus, tree views, rich text fields, and tab panels.
... overview web applications often use javascript to mimic desktop widgets such as menus, tree views, rich text fields, and tab panels.
...ndex.
...w should be removed from the tab order (tabindex="-1").

Concurrency model and the event loop - JavaScript
javascript has a concurrency model based on an event loop, which is responsible for executing the code, collecting and processing events, and executing queued sub-tasks.
... javascript has a concurrency model based on an event loop, which is responsible for executing the code, collecting and processing events, and executing queued sub-tasks.
...les.
...m call back" several runtimes communicating together a web worker or a cross-origin iframe has its own stack, heap, and message queue.

Using Promises - JavaScript
rthand for: const promise = createaudiofileasync(audiosettings); promise.then(successcallback, failurecallback); we call this an asynchronous function call.
... having them cluttering up your output—by adding a handler for the unhandledrejection event, like this: window.addeventlistener("unhandledrejection", event => { /* you might start here by adding code to examine the promise specified by event.promise and the reason in event.reason */ event.preventdefault(); }, false); by calling the event's preventdefault() method, you tell the javascript runtime not to do its default action when rejected promises go unhandled.
... this can be useful at times.
...ult (i.e.

SyntaxError: missing ) after argument list - JavaScript
the javascript exception "missing ) after argument list" occurs when there is an error with how a function is called.
...ght be a typo, a missing operator, or an unescaped string.
...pi: ".
...va" + "script" = \"' + 'java' + 'script\"); // syntaxerror: missing ) after argument list here javascript thinks that you meant to have ); inside the string and ignores it, and it ends up not knowing that you meant the ); to end the function console.log.

Date - JavaScript
javascript date objects represent a single moment in time in a platform-independent format.
...ngle moment in time in a platform-independent format.
....prototype.totimestring() returns the "time" portion of the date as a human-readable string.
...year() methods should be used.

Error - JavaScript
error objects are thrown when runtime errors occur.
...ted and thrown.
...rror object with the intention of raising it using the throw keyword.
...nstanceof rangeerror) { console.error(e.name + ': ' + e.message) } // ...

Object.prototype.valueOf() - JavaScript
d in a github repository.
...tive-examples and send us a pull request.
...pose you have an object type mynumbertype and you want to create a valueof method for it.
...efined 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.

String - JavaScript
aracters correspond to a numerical index: return 'cat'[1] // returns "a" when using bracket notation for character access, attempting to delete or assign a value to these properties will not succeed.
...he usual case-sensitive way.
... certain utf-8 character conversions.
...by double or single quotes) and strings returned from string calls in a non-constructor context (that is, called without using the new keyword) are primitive strings.

WebAssembly.Memory() constructor - JavaScript
the webassembly.memory() constructor creates a new memory object whose buffer property is a resizable arraybuffer or sharedarraybuffer that holds the raw bytes of memory accessed by a webassembly instance.
... the webassembly.memory() constructor creates a new memory object whose buffer property is a resizable arraybuffer or sharedarraybuffer that holds the raw bytes of memory accessed by a webassembly instance.
...he default is false.
...nsole.log(sum); }); creating a shared memory by default, webassembly memories are unshared.

WebAssembly.Memory - JavaScript
the webassembly.memory object is a resizable arraybuffer or sharedarraybuffer that holds the raw bytes of memory accessed by a webassembly instance.
... the webassembly.memory object is a resizable arraybuffer or sharedarraybuffer that holds the raw bytes of memory accessed by a webassembly instance.
...erties memory.prototype.buffer an accessor property that returns the buffer contained in the memory.
...sole.log(sum); }); creating a shared memory by default, webassembly memories are unshared.

Standard built-in objects - JavaScript
this chapter documents all of javascript's standard, built-in objects, including their methods and properties.
... in the global scope.
...cope.
...array uint32array float32array float64array bigint64array biguint64array keyed collections these objects represent collections which use keys.

Exponentiation (**) - JavaScript
-associative: a ** b ** c is equal to a ** (b ** c).
...ceptions.
...e a lower precedence than unary operators.
...nnot put a unary operator (+/-/~/!/delete/void/typeof) immediately before the base number; doing so will cause a syntaxerror.

with - JavaScript
ow for details.
...nt forces the specified object to be searched first for all name lookups.
...h something other than a plain object.
...ar example, array.prototype has been defined with values in its symbol.unscopables object.

Trailing commas - JavaScript
trailing commas (sometimes called "final commas") can be useful when adding new elements, parameters, or properties to javascript code.
... trailing commas (sometimes called "final commas") can be useful when adding new elements, parameters, or properties to javascript code.
... a trailing comma.
...g with trailing comma [a, b,] = [1, 2]; // object destructuring with trailing comma var o = { p: 42, q: true, }; var {p, q,} = o; again, when using a rest element, a syntaxerror will be thrown: var [a, ...b,] = [1, 2, 3]; // syntaxerror: rest element may not have a trailing comma trailing commas in json trailing commas in objects were only introduced in ecmascript 5.

Introduction to using XPath in JavaScript - XPath
this document describes the interface for using xpath in javascript internally, in extensions, and from websites.
...ectively of the xpathresult object.
..., if the returned result type is a node-set then it will only be an unordered_node_iterator_type.
...ir" /> <address street="10 downing street" city="london" country="uk"/> <phonenumber>020 7925 0918</phonenumber> </person> </people> to make the contents of the xml document available within the extension, we create an xmlhttprequest object to load the document synchronously, the variable xmldoc will contain the document as an xmldocument object against which we can use the evaluate method javascript used in the extensions xul/js documents.

International characters in XUL JavaScript - Archive of obsolete content
gecko 1.8, as used in firefox 1.5 and other applications, added support for non-ascii characters in javascript files loaded from xul files.
...e, they can contain a line: var text = "ein schönes beispiel eines mehrsprachigen textes: 日本語"; this mixes german and japanese characters.
... encoding will be the same as the one used by the xul file (which can be specified using an encoding attribute in the <?xml?> tag).

New in JavaScript 1.4 - Archive of obsolete content
the following is a changelog for javascript 1.4, which was only used for netscape's server side javascript released in 1999.
... the following is a changelog for javascript 1.4, which was only used for netscape's server side javascript released in 1999.
... the following is a changelog for javascript 1.4, which was only used for netscape's server side javascript released in 1999.

Describing microformats in JavaScript - Archive of obsolete content
microformats are described in javascript by using a standardized structure format that has several standard members that describe the object.
... microformats are described in javascript by using a standardized structure format that has several standard members that describe the object.
... to be contained in the street-address array.

Parsing microformats in JavaScript - Archive of obsolete content
on the returned object are: string = html.tostring(); returns a string using innertext().
...innerhtml().
...alified uri.

Creating JavaScript tests
there are two large spidermonkey test suites: jstests (in js/src/tests) and jit-tests (in js/src/jit-test).
...e]) check that v1 and v2 are the same value.
...e is basically no cost to adding a new test, so add as many feature tests as needed to cover each feature orthogonally.

How to embed the JavaScript engine
see also jsapi user guide.
...spidermonkey js\src directory.
...u could write: ok = js_definefunction(cx, global, "doit", doit, doit_minargs, 0); or, if you had a bunch of native functions to define, you would probably put them in a table: static jsfunctionspec my_functions[] = { js_fn("doit", doit, doit_minargs, 0), /* etc...

Iterators and generators - JavaScript
« previousnext » processing each of the items in a collection is a very common operation.
...eration.
... alongside done, it is the iterator's return value.

Meta programming - JavaScript
« previousnext » starting with ecmascript 2015, javascript gains support for the proxy and reflect objects allowing you to intercept and define custom behavior for fundamental language operations (e.g.
... « previousnext » starting with ecmascript 2015, javascript gains support for the proxy and reflect objects allowing you to intercept and define custom behavior for fundamental language operations (e.g.
...rn '[[' + name + ']]' } }) let proxy = revocable.proxy console.log(proxy.foo) // "[[foo]]" revocable.revoke() console.log(proxy.foo) // typeerror is thrown proxy.foo = 1 // typeerror again delete proxy.foo // still typeerror typeof proxy // "object", typeof doesn't trigger any trap reflection reflect is a built-in object that provides methods for interceptable javascript operations.

Warning: 08/09 is not a legal ECMA-262 octal constant - JavaScript
the javascript warning "08 (or 09) is not a legal ecma-262 octal constant" occurs when 08 or 09 number literals are used.
... the javascript warning "08 (or 09) is not a legal ecma-262 octal constant" occurs when 08 or 09 number literals are used.
...al ecma-262 octal constant.

SyntaxError: applying the 'delete' operator to an unqualified name is deprecated - JavaScript
the javascript strict mode-only exception "applying the 'delete' operator to an unqualified name is deprecated" occurs when variables are attempted to be deleted using the delete operator.
...riables are attempted to be deleted using the delete operator.
... operator has nothing to do with directly freeing memory.

SyntaxError: test for equality (==) mistyped as assignment (=)? - JavaScript
the javascript warning "test for equality (==) mistyped as assignment (=)?" occurs when there was an assignment (=) when you would normally expect a test for equality (==).
... the javascript warning "test for equality (==) mistyped as assignment (=)?" occurs when there was an assignment (=) when you would normally expect a test for equality (==).
...ment (=) when you would normally expect a test for equality (==).

SyntaxError: identifier starts immediately after numeric literal - JavaScript
the javascript exception "identifier starts immediately after numeric literal" occurs when an identifier started with a digit.
...nly start with a letter, underscore (_), or dollar sign ($).
...syntaxerror what went wrong?

TypeError: invalid assignment to const "x" - JavaScript
the javascript exception "invalid assignment to const" occurs when it was attempted to alter a constant value.
... the javascript exception "invalid assignment to const" occurs when it was attempted to alter a constant value.
...ed.

URIError: malformed URI sequence - JavaScript
the javascript exception "malformed uri sequence" occurs when uri encoding or decoding wasn't successful.
... for example: encodeuri('\ud800\udfff'); // "%f0%90%8f%bf" decoding decoding replaces each escape sequence in the encoded uri component with the character that it represents.
...%90%8f%bf" decoding decoding replaces each escape sequence in the encoded uri component with the character that it represents.

SyntaxError: missing ) after condition - JavaScript
the javascript exception "missing ) after condition" occurs when there is an error with how an if condition is written.
...eyword.
...n your code.

TypeError: "x" is not a function - JavaScript
the javascript exception "is not a function" occurs when there was an attempt to call a value from a function, but the value is not actually a function.
...rt property or method {x} (edge) typeerror: "x" is not a function error type typeerror what went wrong?
...s not a function error type typeerror what went wrong?

InternalError: too much recursion - JavaScript
the javascript exception "too much recursion" or "maximum call stack size exceeded" occurs when there are too many function calls, or a function is missing a base case.
... itself is called a recursive function.
...p(x) { // the base case is missing loop(x + 1); // recursive call } loop(0); // internalerror: too much recursion class error: too much recursion class person{ constructor(){} set name(name){ this.name = name; // recursive call } } const tony = new person(); tony.name = "tonisha"; // internalerror: too much recursion when a value is assigned to the property name (this.name = name;) javascript needs to set that property.

SyntaxError: unterminated string literal - JavaScript
the javascript error "unterminated string literal" occurs when there is an unterminated string somewhere.
...literal" occurs when there is an unterminated string somewhere.
...-quoted strings.

Array() constructor - JavaScript
the array() constructor is used to create array objects.
...jects.
...gle argument is passed to the array constructor and that argument is a number (see the arraylength parameter below).

AsyncFunction - JavaScript
the asyncfunction constructor creates a new async function object.
...is actually an asyncfunction object.
...of(async function(){}).constructor syntax new asyncfunction([arg1[, arg2[, ...argn]],] functionbody) parameters arg1, arg2, ...

Function() constructor - JavaScript
ple is stored in a github repository.
...and send us a pull request.
...e passed.

Function.prototype.bind() - JavaScript
se noncompliant deviation details.
...second latebloomer.prototype.bloom = function() { window.settimeout(this.declare.bind(this), 1000); }; latebloomer.prototype.declare = function() { console.log(`i am a beautiful flower with ${this.petalcount} petals!`); }; const flower = new latebloomer(); flower.bloom(); // after 1 second, calls 'flower.declare()' bound functions used as constructors warning: this section demonstrates javascript capabilities and documents some edge cases of the bind() method.
...nceof yaxispoint; // true new yaxispoint(17, 42) instanceof point; // true note that you need not do anything special to create a bound function for use with new.

Function.name - JavaScript
he interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...ributes of function.name writable no enumerable no configurable yes note that in non-standard, pre-es2015 implementations the configurable attribute was false as well.
... no configurable yes note that in non-standard, pre-es2015 implementations the configurable attribute was false as well.

GeneratorFunction - JavaScript
the generatorfunction constructor creates a new generator function object.
...ratorfunction object.
...of(function*(){}).constructor syntax new generatorfunction ([arg1[, arg2[, ...argn]],] functionbody) parameters arg1, arg2, ...

Math.imul() - JavaScript
n value the result of the c-like 32-bit multiplication of the given arguments.
... numbers in imul, you will experience a degrade in performance.
...) & 0xffff; var blo = b & 0xffff; // the shift by 0 fixes the sign on the high part // the final |0 converts the unsigned value into a signed value return ((alo * blo) + (((ahi * blo + alo * bhi) << 16) >>> 0) | 0); }; however, the following function is more performant because it is likely that browsers in which this polyfill would be used do not optimize with an internal integer type in javascript, instead using floating points for all numbers.

Math - JavaScript
...
...operties and methods of math are static.
... function degtorad(degrees) { return degrees * (math.pi / 180); }; function radtodeg(rad) { return rad / (math.pi / 180); }; calculating the height of an equalateral triangle if we want to calculate the height of an equalateral triangle, and we know its side length is 100, we can use the formulae length of the adjacent multiplied by the tangent of the angle is equal to the opposite.

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.
...ption the __proto__ getter function exposes the value of the internal [[prototype]] of an object.
...ts created using an object literal, this value is object.prototype.

Object.prototype.toString() - JavaScript
n an object is referred to in a manner in which a string is expected.
...g.prototype.tostring = function dogtostring() { const ret = 'dog ' + this.name + ' is a ' + this.sex + ' ' + this.color + ' ' + this.breed; return ret; } or, using es6 template strings: dog.prototype.tostring = function dogtostring() { return `dog ${this.name} is a ${this.sex} ${this.color} ${this.breed}`; } with the preceding code in place, any time thedog is used in a string context, javascript automatically calls the dogtostring() function, which returns the following string: "dog gabby is a female chocolate lab" using tostring() to detect object class tostring() can be used with every object and (by default) allows you to get its class.
...object.prototype.tostring() with every object, you need to call function.prototype.call() or function.prototype.apply() on it, passing the object you want to inspect as the first parameter (called thisarg).

Object - JavaScript
the object class represents one of javascript's data types.
... the object class represents one of javascript's data types.
...op-value')) { return this['-prop-value']; } else { // it doesn't look like one of my objects, so let's fall back on // the default behavior by reproducing the current behavior as best we can.

String.raw() - JavaScript
substitution values.
...string.raw() is used with template strings.
...in the output string.

WebAssembly.Instance.prototype.exports - JavaScript
the exports readonly property of the webassembly.instance object prototype returns an object containing as its members all the functions exported from the webassembly module instance, to allow them to be accessed and used by javascript.
...assembly.instance object prototype returns an object containing as its members all the functions exported from the webassembly module instance, to allow them to be accessed and used by javascript.
...nce.

WebAssembly.Instance - JavaScript
a webassembly.instance object is a stateful, executable instance of a webassembly.module.
...le.
...ction like this: const importobject = { imports: { imported_func: function(arg) { console.log(arg); } } }; webassembly.instantiatestreaming(fetch('simple.wasm'), importobject) .then(obj => obj.instance.exports.exported_func()); this also demonstrates how the exports property is used to access exported functions.

WebAssembly.Table.prototype.set() - JavaScript
the set() prototype method of the webassembly.table object mutates a reference stored at a given index to a different value.
...object) .then(function(obj) { console.log(tbl.length); console.log(tbl.get(0)()); console.log(tbl.get(1)()); }); note how you've got to include a second function invocation operator at the end of the accessor to actually invoke the referenced function and log the value stored inside it (e.g.
... a second function invocation operator at the end of the accessor to actually invoke the referenced function and log the value stored inside it (e.g.

WebAssembly - JavaScript
the webassembly javascript object acts as the namespace for all webassembly-related functionality.
...webassembly.table() constructors.
... into the function when it fulfills.

undefined - JavaScript
the global undefined property represents the primitive value undefined.
...example is stored in a github repository.
...f (typeof x === 'undefined') { // these statements execute } one reason to use typeof is that it does not throw an error if the variable has not been declared.

Property accessors - JavaScript
ake a distinction between properties and methods.
...bol.
...[bar]) in the spidermonkey javascript engine, this string would be "[object object]".

Expressions and operators - JavaScript
this chapter documents all the javascript language operators, expressions and keywords.
... this chapter documents all the javascript language operators, expressions and keywords.
...perator.

empty - JavaScript
an empty statement is used to provide no statement, although the javascript syntax would expect one.
...nt, although the javascript syntax would expect one.
...is stored in a github repository.

label - JavaScript
can refer to.
...tored in a github repository.
... label any javascript identifier that is not a reserved word.

switch - JavaScript
so this block will run console.log(0); // note: the forgotten break would have been here case 1: // no break statement in 'case 0:' so this case will run as well console.log(1); break; // it encounters this break so will not continue into 'case 2:' case 2: console.log(2); break; default: console.log('default'); } can i put a default between cases?
...match: var foo = 5; switch (foo) { case 2: console.log(2); break; // it encounters this break so will not continue into 'default:' default: console.log('default') // fall-through case 1: console.log('1'); } it also works when you put default before all other cases.
...); break; case 'dinosaur': default: console.log('this animal will not.'); } multi-case : chained operations this is an example of a multiple-operation sequential case clause, where, depending on the provided integer, you can receive different output.

try...catch - JavaScript
block is skipped.
...block will always execute after the try-block and catch-block(s) have finished executing.
...lock and catch-block(s) have finished executing.

Statements and declarations - JavaScript
javascript applications consist of statements with an appropriate syntax.
...y brackets.
... others debugger invokes any available debugging functionality.

Using the Mozilla JavaScript interface to XSL Transformations - XSLT: Extensible Stylesheet Language Transformations
this document describes the javascript interface in mozilla 1.2 and up to the xslt processing engine (transformiix).
... xhtml should work as expected though.
...ents instantiating an xsltprocessor from an xpcom component requires a different syntax as the constructor is not defined inside components.

JavaScript crypto - Archive of obsolete content
ility table at the bottom of this page to guide your decision.
... to guide your decision.

Using JavaScript Generators in Firefox - Archive of obsolete content
warning: this technique works only in firefox, not ie, chrome, safari, etc.
... warning: this technique works only in firefox, not ie, chrome, safari, etc.

Property (JavaScript) - MDN Web Docs Glossary: Definitions of Web-related terms
a javascript property is a characteristic of an object, often describing attributes associated with a data structure.
...g) and a value (primitive, method, or object reference).

Test your skills: Object-oriented JavaScript - Learn web development
the aim of this skill test is to assess whether you've understood our object-oriented javascript for beginners, object prototypes, and inheritance in javascript articles.
...load the code and use an online tool such as codepen, jsfiddle, or glitch to work on the tasks.

JavaScript OS.Constants
javascript module os.constants contains operating system-specific constants.
... os.constants.sys constants related to system configuration.

Unicode property escapes - JavaScript
ified, the value must correspond to the property type given.
...is the digit 2 in arabic-indic notation // while it is predominantly written within the arabic script // it can also be written in the thaana script "٢".match(/\p{script=thaana}/u); // null as thaana is not the predominant script super() "٢".match(/\p{script_extensions=thaana}/u); // ["٢", index: 0, input: "٢", groups: undefined] unicode property escapes vs.

Classes - JavaScript
constructor(height, width) { this.height = height; this.width = width; } } static (class-side) data properties and prototype data properties must be defined outside of the classbody declaration: rectangle.staticwidth = 20; rectangle.prototype.prototypewidth = 25; field declarations public and private field declarations are an experimental feature (stage 3) proposed at tc39, the javascript standards committee.
...de of the classbody declaration: rectangle.staticwidth = 20; rectangle.prototype.prototypewidth = 25; field declarations public and private field declarations are an experimental feature (stage 3) proposed at tc39, the javascript standards committee.

SyntaxError: invalid regular expression flag "x" - JavaScript
the javascript exception "invalid regular expression flag" occurs when the flags, defined after the second slash in regular expression literal, are not one of g, i, m, s, u, or y.
... two slashes is interpreted as a regular expression literal.

TypeError: property "x" is non-configurable and can't be deleted - JavaScript
the javascript exception "property is non-configurable and can't be deleted" occurs when it was attempted to delete a property, but that property is non-configurable.
...r object.freeze().

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.touppercase is deprecated; use string.prototype.touppercase instead warning: string.trim is deprecated; use string.prototype.trim instead warning: string.trimleft is deprecated; use string.prototype.trimleft instead warning: string.trimright is deprecated; use string.prototype.trimright instead error type warning.

ReferenceError: deprecated caller or arguments usage - JavaScript
the javascript strict mode-only exception "deprecated caller or arguments usage" occurs when the deprecated function.caller or function.arguments properties are used.
... typeerror: 'arguments', 'callee' and 'caller' are restricted function properties and cannot be accessed in this context (edge) warning: referenceerror: deprecated caller usage (firefox) warning: referenceerror: deprecated arguments usage (firefox) typeerror: 'callee' and 'caller' cannot be accessed in strict mode.

Warning: expression closures are deprecated - JavaScript
the javascript warning "expression closures are deprecated" occurs when the non-standard expression closure syntax (shorthand function syntax) is used.
... the javascript warning "expression closures are deprecated" occurs when the non-standard expression closure syntax (shorthand function syntax) is used.

Warning: Date.prototype.toLocaleFormat is deprecated - JavaScript
the javascript warning "date.prototype.tolocaleformat is deprecated; consider using intl.datetimeformat instead" occurs when the non-standard date.prototype.tolocaleformat method is used.
... the javascript warning "date.prototype.tolocaleformat is deprecated; consider using intl.datetimeformat instead" occurs when the non-standard date.prototype.tolocaleformat method is used.

SyntaxError: missing formal parameter - JavaScript
the javascript exception "missing formal parameter" occurs when your function declaration is missing valid parameters.
...n parameter".

SyntaxError: missing = in const declaration - JavaScript
the javascript exception "missing = in const declaration" occurs when a const declaration was not given a value in the same statement (like const red_flag;).
...(const red_flag = '#ff0').

SyntaxError: missing name after . operator - JavaScript
the javascript exception "missing name after .
...to specify the name of the property that you want to access.

SyntaxError: missing variable name - JavaScript
the javascript exception "missing variable name" occurs way too often as naming things is so hard.
...ss comma?

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.
...ent wrong?

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.
...ct.defineproperty() or object.freeze().

SyntaxError: redeclaration of formal parameter "x" - JavaScript
the javascript exception "redeclaration of formal parameter" occurs when the same variable name occurs as a function parameter and is then redeclared using a let assignment in a function body again.
...(edge) syntaxerror: redeclaration of formal parameter "x" (firefox) syntaxerror: identifier "x" has already been declared (chrome) error type syntaxerror what went wrong?

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.
... the javascript exception "reduce of empty array with no initial value" occurs when a reduce function is used.

RangeError: repeat count must be less than infinity - JavaScript
the javascript exception "repeat count must be less than infinity" occurs when the string.prototype.repeat() method is used with a count argument that is infinity.
...or what went wrong?

ReferenceError: assignment to undeclared variable "x" - JavaScript
the javascript strict mode-only exception "assignment to undeclated variable" occurs when the value has been assigned to an undeclared variable.
...is not defined (chrome) referenceerror: variable undefined in strict mode (edge) error type referenceerror warning in strict mode only.

ReferenceError: reference to undefined property "x" - JavaScript
the javascript warning "reference to undefined property" occurs when a script attempted to access an object property which doesn't exist.
... the javascript warning "reference to undefined property" occurs when a script attempted to access an object property which doesn't exist.

TypeError: variable "x" redeclares argument - JavaScript
the javascript strict mode-only exception "variable redeclares argument" occurs when the same variable name occurs as a function parameter and is then redeclared using a var assignment in a function body again.
... as a function parameter and is then redeclared using a var assignment in a function body again.

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.
...(chrome) error type typeerror what went wrong?

arguments.callee - JavaScript
(also called "anonymous functions").
...e major effect: it makes a large number of optimizations impossible, or much much more difficult.

Array.prototype.find() - JavaScript
not visit any elements added to the array after the call to find begins.
...e, t, « kvalue, k, o »)).

Array.prototype.toSource() - JavaScript
epresenting the source code of the array.
... code.

Array.prototype.toString() - JavaScript
the tostring() method returns a string representing the specified array and its elements.
... description the array object overrides the tostring method of object.

DataView - JavaScript
licit control of how data is accessed, regardless of the executing computer's endianness.
... left + 2**32*right : 2**32*left + right; if (!number.issafeinteger(combined)) console.warn(combined, 'exceeds max_safe_integer.

Date.prototype[@@toPrimitive] - JavaScript
at is either of type number or of type string.
...perty does not exist, it tries to call the valueof method and if the valueof does not exist either, [@@toprimitive]() throws a typeerror.

Date() constructor - JavaScript
creates a javascript date instance that represents a single moment in time in a platform-independent format.
...efault is 0 minutes past the hour.

Function.prototype.apply() - JavaScript
out equal to math.max(numbers[0], ...) // or math.max(5, 6, ...) let min = math.min.apply(null, numbers); // vs.
...i = 0; i < numbers.length; i++) { if (numbers[i] > max) { max = numbers[i]; } if (numbers[i] < min) { min = numbers[i]; } } but beware: by using apply this way, you run the risk of exceeding the javascript engine's argument length limit.

Function.prototype.toSource() - JavaScript
the tosource() method returns a string representing the source code of the object.
...ing to examine the contents of an object.

Intl.Locale.prototype.toString() - JavaScript
ns the locale's full locale identifier string.
...locale.tostring() return value the locale's unicode locale identifier string.

Math.fround() - JavaScript
ct, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...ffer a very high precision.

Number.MAX_SAFE_INTEGER - JavaScript
the number.max_safe_integer constant represents the maximum safe integer in javascript (253 - 1).
.../mdn/interactive-examples and send us a pull request.

Number.MIN_SAFE_INTEGER - JavaScript
the number.min_safe_integer constant represents the minimum safe integer in javascript (-(253 - 1)).
...eractive-examples and send us a pull request.

Number.MIN_VALUE - JavaScript
the number.min_value property represents the smallest positive numeric value representable in javascript.
...o the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Number.isNaN() - JavaScript
uest.
...ison to the global isnan() function, number.isnan() doesn't suffer the problem of forcefully converting the parameter to a number.

Object.defineProperties() - JavaScript
is property descriptor may be changed and if the property may be deleted from the corresponding object.
...tor.

Object.keys() - JavaScript
iption object.keys() returns an array whose elements are strings corresponding to the enumerable properties found directly upon object.
...dontenumbug) { for (i = 0; i < dontenumslength; i++) { if (hasownproperty.call(obj, dontenums[i])) { result.push(dontenums[i]); } } } return result; }; }()); } please note that the above code includes non-enumerable keys in ie7 (and maybe ie8), when passing in an object from a different window.

Object.setPrototypeOf() - JavaScript
the object.setprototypeof() method sets the prototype (i.e., the internal [[prototype]] property) of a specified object to another object or null.
... the object.setprototypeof() method sets the prototype (i.e., the internal [[prototype]] property) of a specified object to another object or null.

Object.prototype.toSource() - JavaScript
e contents of an object.
...ructor or providing an anonymous function.

Proxy - JavaScript
t value when the property name is not in the object.
...p, p.c); // false, 37 no-op forwarding proxy in this example, we are using a native javascript object to which our proxy will forward all operations that are applied to it.

RegExp - JavaScript
the regexp object is used for matching text with a pattern.
...normal string escape rules (preceding special characters with \ when included in a string) are necessary.

String.prototype.charCodeAt() - JavaScript
string.
... or greater, for such characters, it is necessary to retrieve not only charcodeat(i), but also charcodeat(i+1) (as if manipulating a string with two letters), or to use codepointat(i) instead.

Symbol.prototype[@@toPrimitive] - JavaScript
the [@@toprimitive]() method converts a symbol object to a primitive value.
...bol.toprimitive](hint) return value the primitive value of the specified symbol object.

Symbol.prototype.valueOf() - JavaScript
the valueof() method returns the primitive value of a symbol object.
... method returns the primitive value of a symbol object.

TypedArray.prototype.toString() - JavaScript
mples the typedarray objects override the tostring method of object.
...rray and uses tostring to convert the array to a string.

WebAssembly.Global() constructor - JavaScript
a webassembly.global() constructor creates a new global object representing a global variable instance, accessible from both javascript and importable/exportable across one or more webassembly.module instances.
... instance.exports.getglobal(), 0); global.value = 42; asserteq("getting js-updated value from wasm", instance.exports.getglobal(), 42); instance.exports.incglobal(); asserteq("getting wasm-updated value from js", global.value, 43); }); note: you can see the example running live on github; see also the source code.

WebAssembly.Global - JavaScript
a webassembly.global object represents a global variable instance, accessible from both javascript and importable/exportable across one or more webassembly.module instances.
... instance.exports.getglobal(), 0); global.value = 42; asserteq("getting js-updated value from wasm", instance.exports.getglobal(), 42); instance.exports.incglobal(); asserteq("getting wasm-updated value from js", global.value, 43); }); note: you can see the example running live on github; see also the source code.

WebAssembly.Table() constructor - JavaScript
object) .then(function(obj) { console.log(tbl.length); console.log(tbl.get(0)()); console.log(tbl.get(1)()); }); note how you've got to include a second function invocation operator at the end of the accessor to actually invoke the referenced function and log the value stored inside it (e.g.
... a second function invocation operator at the end of the accessor to actually invoke the referenced function and log the value stored inside it (e.g.

WebAssembly.Table.prototype.get() - JavaScript
the get() prototype method of the webassembly.table() object retrieves a function reference stored at a given index.
...tance.exports.tbl; console.log(tbl.get(0)()); // 13 console.log(tbl.get(1)()); // 42 }); note how you've got to include a second function invocation operator at the end of the accessor to actually retrieve the value stored inside the reference (e.g.

WebAssembly.instantiate() - JavaScript
embly.linkerror, or webassembly.runtimeerror, depending on the cause of the failure.
...inside it.

decodeURI() - JavaScript
) exception when encodeduri contains invalid character sequences.
...s each escape sequence in the encoded uri with the character that it represents, but does not decode escape sequences that could not have been introduced by encodeuri.

decodeURIComponent() - JavaScript
fier.
...he decoded version of the given encoded uniform resource identifier (uri) component.

Iteration protocols - JavaScript
as a couple of additions to ecmascript 2015, iteration protocols aren't new built-ins or syntax, but protocols.
...with at least the following two properties: done (boolean) has the value false if the iterator was able to produce the next value in the sequence.

this - JavaScript
a function's this keyword behaves a little differently in javascript compared to other languages.
...igned to the variable p doesn't have its own f property, it inherits it from its prototype.

block - JavaScript
yntax block statement { statementlist } labelled block statement labelidentifier: { statementlist } statementlist statements grouped within the block statement.
...tementlist } statementlist statements grouped within the block statement.

if...else - JavaScript
...
...tring (""), and any object, including a boolean object whose value is false, is considered truthy when used as the condition.

import.meta - JavaScript
the import.meta object exposes context-specific metadata to a javascript module.
...he base url of the module.

let - JavaScript
ce for this interactive example is stored in a github repository.
...s://github.com/mdn/interactive-examples and send us a pull request.

var - JavaScript
part of the global lexical environment).
...to create a property named `foo` on the global object globalthis.hasownproperty('foo') // true in ecmascript 5, this behavior was changed for strict mode.

Transitioning to strict mode - JavaScript
) {} } obvious errors declaring twice the same name for a property name in an object literal {a: 1, b: 3, a: 7} this is no longer the case in ecmascript 2015 (bug 1041128).
...apply, if the value was a primitive value, this one was boxed into an object (or the global object for undefined and null).

JavaScript OS.Shared - Archive of obsolete content
module os.shared contains tools to interact with the operating system (and, more generally, in c) in javascript.

Microsoft JavaScript extensions - Archive of obsolete content
warning: these apis will only work in microsoft applications, and are not on a standards track.

JavaScript libraries from Mozilla projects
in addition to firefox and other applications, mozilla developers have created a number of useful javascript libraries you can use in your projects.

JavaScript OS
the javascript os module contains tools that allow chrome content (i.e.

Using workers in JavaScript code modules
ker obsolete since gecko 8.0 (firefox 8.0 / thunderbird 8.0 / seamonkey 2.5)this feature is obsolete.

javascript.options.showInConsole
the preference javascript.options.showinconsole controls whether errors or warnings in chrome code are shown in the error console.

L20n Javascript API
l20n javascript api var ctx = l20n.getcontext(); ctx.linkresource('./locales/strings.l20n'); ctx.requestlocales(); when you freeze the context by calling requestlocales, the resource files will be retrieved, parsed and compiled.

Running Automated JavaScript Tests
command-line argument, where pattern is a regexp pattern that is tested against file:///{path_to_obj_dir}/dist/test-stage/jsreftest/tests/jsreftest.html?test={relative_path_to_test_from_js/src/tests} string: ./mach jstestbrowser --filter=pattern running jstests on treeherder when viewing treeherder after a push to the mozilla repositories, jstests run in the browser are shown as r(j) meaning "javascript reftests".

Places utilities for JavaScript
re we visit a url, we will use transition_bookmark as the transition for the visit to that url (if we don't have a referrer).

The Firefox JavaScript Debugger - Firefox Developer Tools
the javascript debugger enables you to step through javascript code and examine or modify its state to help track down bugs.

Equality comparisons and sameness - JavaScript
quality algorithms in es2015: abstract equality comparison (==) strict equality comparison (===): used by array.prototype.indexof, array.prototype.lastindexof, and case-matching samevaluezero: used by %typedarray% and arraybuffer constructors, as well as map and set operations, and also string.prototype.includes and array.prototype.includes since es2016 samevalue: used in all other places javascript provides three different value-comparison operations: === - strict equality comparison ("strict equality", "identity", "triple equals") == - abstract equality comparison ("loose equality", "double equals") object.is provides samevalue (new in es2015).

Keyed collections - JavaScript
using array.from or the spread operator.

Public class fields - JavaScript
this page describes experimental features.

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.

RangeError: radix must be an integer - JavaScript
the javascript exception "radix must be an integer at least 2 and no greater than 36" occurs when the optional radix parameter of the number.prototype.tostring() or the bigint.prototype.tostring() method was specified and is not between 2 and 36.

SyntaxError: return not in function - JavaScript
the javascript exception "return (or yield) not in function" occurs when a return or yield statement is called outside of a function.

TypeError: X.prototype.y called on incompatible type - JavaScript
the javascript exception "called on incompatible target (or object)" occurs when a function (on a given object), is called with a this not corresponding to the type expected by the function.

ReferenceError: can't access lexical declaration`X' before initialization - JavaScript
the javascript exception "can't access lexical declaration `variable' before initialization" occurs when a lexical variable was accessed before it was initialized.

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.

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.

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.

TypeError: can't redefine non-configurable property "x" - JavaScript
the javascript exception "can't redefine non-configurable property" occurs when it was attempted to redefine a property, but that property is non-configurable.

TypeError: cyclic object value - JavaScript
the javascript exception "cyclic object value" occurs when object references were found in json.

TypeError: can't access dead object - JavaScript
the javascript exception "can't access dead object" occurs when firefox disallows add-ons to keep strong references to dom objects after their parent document has been destroyed to improve in memory usage and to prevent memory leaks.

SyntaxError: "0"-prefixed octal literals and octal escape seq. are deprecated - JavaScript
the javascript strict mode-only exception "0-prefixed octal literals and octal escape sequences are deprecated; for octal literals use the "0o" prefix instead" occurs when deprecated octal literals and octal escape sequences are used.

TypeError: setting getter-only property "x" - JavaScript
the javascript strict mode-only exception "setting getter-only property" occurs when there is an attempt to set a new value to a property for which only a getter is specified.

SyntaxError: illegal character - JavaScript
the javascript exception "illegal character" occurs when there is an invalid or unexpected token that doesn't belong at this position in the code.

RangeError: invalid array length - JavaScript
the javascript exception "invalid array length" occurs when creating an array or an arraybuffer which has a length which is either negative or larger or equal to 232, or when setting the array.length property to a value which is either negative or larger or equal to 232.

ReferenceError: invalid assignment left-hand side - JavaScript
the javascript exception "invalid assignment left-hand side" occurs when there was an unexpected assignment somewhere.

RangeError: invalid date - JavaScript
the javascript exception "invalid date" occurs when a string leading to an invalid date has been provided to date or date.parse().

SyntaxError: for-in loop head declarations may not have initializers - JavaScript
the javascript strict mode-only exception "for-in loop head declarations may not have initializers" occurs when the head of a for...in contains an initializer expression, such as |for (var i = 0 in obj)|.

SyntaxError: a declaration in the head of a for-of loop can't have an initializer - JavaScript
the javascript exception "a declaration in the head of a for-of loop can't have an initializer" occurs when the head of a for...of loop contains an initializer expression such as |for (var i = 0 of iterable)|.

SyntaxError: JSON.parse: bad parsing - JavaScript
the javascript exceptions thrown by json.parse() occur when string failed to be parsed as json.

SyntaxError: Malformed formal parameter - JavaScript
the javascript exception "malformed formal parameter" occurs when the argument list of a function() constructor call is invalid somehow.

SyntaxError: missing ] after element list - JavaScript
the javascript exception "missing ] after element list" occurs when there is an error with the array initializer syntax somewhere.

SyntaxError: missing : after property id - JavaScript
the javascript exception "missing : after property id" occurs when objects are created using the object initializer syntax.

SyntaxError: missing } after function body - JavaScript
the javascript exception "missing } after function body" occurs when there is a syntax mistake when creating a function somewhere.

SyntaxError: missing } after property list - JavaScript
the javascript exception "missing } after property list" occurs when there is a mistake in the object initializer syntax somewhere.

TypeError: More arguments needed - JavaScript
the javascript exception "more arguments needed" occurs when there is an error with how a function is called.

RangeError: repeat count must be non-negative - JavaScript
the javascript exception "repeat count must be non-negative" occurs when the string.prototype.repeat() method is used with a count argument that is a negative number.

TypeError: "x" is not a non-null object - JavaScript
the javascript exception "is not a non-null object" occurs when an object is expected somewhere and wasn't provided.

TypeError: "x" has no properties - JavaScript
the javascript exception "null (or undefined) has no properties" occurs when you attempt to access properties of null and undefined.

TypeError: can't delete non-configurable array element - JavaScript
the javascript exception "can't delete non-configurable array element" occurs when it was attempted to shorten the length of an array, but one of the array's elements is non-configurable.

RangeError: argument is not a valid code point - JavaScript
the javascript exception "invalid code point" occurs when nan values, negative integers (-1), non-integers (5.4), or values larger than 0x10ffff (1114111) are used with string.fromcodepoint().

ReferenceError: "x" is not defined - JavaScript
the javascript exception "variable is not defined" occurs when there is a non-existent variable referenced somewhere.

RangeError: precision is out of range - JavaScript
the javascript exception "precision is out of range" occurs when a number that's outside of the range of 0 and 20 (or 21) was passed into tofixed or toprecision.

Error: Permission denied to access property "x" - JavaScript
the javascript exception "permission denied to access property" occurs when there was an attempt to access an object for which you have no permission.

SyntaxError: "x" is a reserved identifier - JavaScript
the javascript exception "variable is a reserved identifier" occurs when reserved keywords are used as identifiers.

Warning: unreachable code after return statement - JavaScript
the javascript warning "unreachable code after return statement" occurs when using an expression after a return statement, or when using a semicolon-less return statement but including an expression directly after.

SyntaxError: "use strict" not allowed in function with non-simple parameters - JavaScript
the javascript exception "'use strict' not allowed in function" occurs when a "use strict" directive is used at the top of a function with default parameters, rest parameters, or destructuring parameters.

TypeError: invalid arguments - JavaScript
the javascript exception "invalid arguments" occurs when typed array constructors are provided with a wrong argument.

SyntaxError: Unexpected token - JavaScript
the javascript exceptions "unexpected token" occur when a specific language construct was expected, but something else was provided.

TypeError: "x" is (not) "y" - JavaScript
the javascript exception "x is (not) y" occurs when there was an unexpected type.

SyntaxError: function statement requires a name - JavaScript
the javascript exception "function statement requires a name" occurs when there is a function statement in the code that requires a name.

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.

TypeError: invalid 'instanceof' operand 'x' - JavaScript
the javascript exception "invalid 'instanceof' operand" occurs when the right hand side operands of the instanceof operator isn't used with a constructor object, i.e.

Default parameters - JavaScript
fault values if no value or undefined is passed.

getter - JavaScript
erty to bind to the given function.

Rest parameters - JavaScript
example is stored in a github repository.

setter - JavaScript
a pull request.

Array.prototype[@@iterator]() - JavaScript
te over a sequence of values.

Array.prototype.reduce() - JavaScript
(o, pk).

Array.prototype.fill() - JavaScript
rguments[2]; var relativeend = end === undefined ?

Array.prototype.findIndex() - JavaScript
oboolean(?

Array.isArray() - JavaScript
ay.isarray({foo: 123}); // false array.isarray('foobar'); // false array.isarray(undefined); // false syntax array.isarray(value) parameters value the value to be checked.

Array.prototype.lastIndexOf() - JavaScript
n != (1 / 0) && n != -(1 / 0)) { n = (n > 0 || -1) * math.floor(math.abs(n)); } } for (k = n >= 0 ?

Array.prototype.push() - JavaScript
ntentionally generic, and we can use that to our advantage.

Array.prototype.toLocaleString() - JavaScript
les, options » // ) // ) r = nextelement == null ?

BigInt.prototype.toString() - JavaScript
sign, not the two's complement of the bigintobj.

BigInt - JavaScript
bigint is a built-in object that provides a way to represent whole numbers larger than 253 - 1, which is the largest number javascript can reliably represent with the number primitive and represented by the number.max_safe_integer constant.

Boolean.prototype.toString() - JavaScript
please clone https://github.com/mdn/interactive-examples and send us a pull request.

Boolean.prototype.valueOf() - JavaScript
ntribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Date.prototype.getTime() - JavaScript
the gettime() method returns the number of milliseconds* since the unix epoch.

Date.prototype.getYear() - JavaScript
y getyear() is between 0 and 99.

Date.prototype.setHours() - JavaScript
70 00:00:00 utc until the time represented by the updated date instance.

Date.prototype.setMinutes() - JavaScript
e setminutes() method sets the minutes for a specified date according to local time.

Date.prototype.setMonth() - JavaScript
the setmonth() method sets the month for a specified date according to the currently set year.

Date.prototype.setSeconds() - JavaScript
the setseconds() method sets the seconds for a specified date according to local time.

Date.prototype.toString() - JavaScript
ostring() method is automatically called when a date is to be represented as a text value, e.g.

Date.prototype.valueOf() - JavaScript
valueof() return value the number of milliseconds between 1 january 1970 00:00:00 utc and the given date.

Error.prototype.stack - JavaScript
olon, and, if there is a file location, the line number.

EvalError() constructor - JavaScript
the evalerror constructor creates a new error regarding the global eval() function.

EvalError - JavaScript
the evalerror object indicates an error regarding the global eval() function.

Function.prototype.toString() - JavaScript
us a pull request.

Function - JavaScript
every javascript function is actually a function object.

Generator.prototype.next() - JavaScript
d to variable.

Generator.prototype.throw() - JavaScript
ror.

Infinity - JavaScript
f the global object.

InternalError() constructor - JavaScript
the internalerror() constructor creates an error that indicates an error that occurred internally in the javascript engine.

InternalError - JavaScript
the internalerror object indicates an error that occurred internally in the javascript engine.

Intl.Locale.prototype.collation - JavaScript
description collation is the process of ordering strings of characters.

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.

Intl.Locale.prototype.maximize() - JavaScript
entifier subtags based on an incomplete langauage id.

Intl.Locale.prototype.region - JavaScript
n essential part of the locale identifier, as it places the locale in a specific area of the world.

Intl - JavaScript
are registered in the iana language subtag registry.

Map - JavaScript
cluding functions, objects, or any primitive).

Math.clz32() - JavaScript
first one integer |= integer << 16; integer |= integer << 8; integer |= integer << 4; integer |= integer << 2; integer |= integer << 1; // 2.

Math.log() - JavaScript
the math.log() function returns the natural logarithm (base e) of a number, that is ∀x>0,math.log(x)=ln(x)=the uniqueysuch thatey=x\forall x > 0, \mathtt{\operatorname{math.log}(x)} = \ln(x) = \text{the unique} \; y \; \text{such that} \; e^y = x the javascript math.log() function is equivalent to ln(x) in mathematics.

Math.random() - JavaScript
en or reset by the user.

Math.random() - JavaScript
en or reset by the user.

Number.MAX_VALUE - JavaScript
the number.max_value property represents the maximum numeric value representable in javascript.

Number.prototype.toSource() - JavaScript
tosource() return value a string representing the source code of the object.

Number.prototype.valueOf() - JavaScript
the source for this interactive example is stored in a github repository.

Object.create() - JavaScript
new error("this browser's implementation of object.create is a shim and doesn't support a second argument."); } function f() {} f.prototype = proto; return new f(); }; } examples classical inheritance with object.create() below is an example of how to use object.create() to achieve classical inheritance.

Object.defineProperty() - JavaScript
ype of this property descriptor may be changed and if the property may be deleted from the corresponding object.

Object.getOwnPropertyDescriptor() - JavaScript
object.getownpropertydescriptor(obj, prop) parameters obj the object in which to look for the property.

Object.getOwnPropertyDescriptors() - JavaScript
a given object.

Object.prototype.hasOwnProperty() - JavaScript
oop that hasownproperty itself is confined strictly to enumerable items (as with object.getownpropertynames()).

Promise - JavaScript
alled, so there is no race condition between an asynchronous operation completing and its handlers being attached.

Comparing Reflect and Object methods - JavaScript
the reflect object, introduced in es2015, is a built-in object that provides methods to interface with javascript objects.

Reflect - JavaScript
reflect is a built-in object that provides methods for interceptable javascript operations.

RegExp() constructor - JavaScript
the regexp constructor creates a regular expression object for matching text with a pattern.

RegExp.prototype.exec() - JavaScript
the exec() method executes a search for a match in a specified string.

RegExp.input ($_) - JavaScript
ession is changed and that string is matching.

RegExp.lastMatch ($&) - JavaScript
rthand alias with the dot property accessor (regexp.$&), because the parser expects an expression with "&" in that case and a syntaxerror is thrown.

RegExp.lastParen ($+) - JavaScript
hand alias with the dot property accessor (regexp.$+), because the parser expects an expression with "+" in that case and a syntaxerror is thrown.

RegExp.leftContext ($`) - JavaScript
property accessor (regexp.$`), because the parser expects a starting template string in that case and a syntaxerror is thrown.

RegExp.$1-$9 - JavaScript
/.test(str) ?

RegExp.rightContext ($') - JavaScript
e dot property accessor (regexp.$'), because the parser expects a starting string in that case and a syntaxerror is thrown.

RegExp.prototype.toSource() - JavaScript
eturn value a string representing the source code of the given regexp object.

String.prototype.charAt() - JavaScript
string representing the character (exactly one utf-16 code unit) at the specified index.

String.prototype.codePointAt() - JavaScript
first = string.charcodeat(index); var second; if ( // check if it’s the start of a surrogate pair first >= 0xd800 && first <= 0xdbff && // high surrogate size > index + 1 // there is a 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; } }()); }...

String.prototype.endsWith() - JavaScript
if provided, it is used as the length of str.

String.fromCodePoint() - JavaScript
>>0) === codepoint clause handles decimals and negatives if (!(codepoint < 0x10ffff && (codepoint>>>0) === codepoint)) throw rangeerror("invalid code point: " + codepoint); if (codepoint <= 0xffff) { // bmp code point codelen = codeunits.push(codepoint); } else { // astral code point; split in surrogate halves // https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae codepoint -= 0x10000; codelen = codeunits.push( (codepoint >> 10) + 0xd800, // highsurrogate (codepoint % 0x400) + 0xdc00 // lowsurrogate ); } if (codelen >= 0x3fff) { result += stringfromcharcode.apply(null, codeunits); codeunits.length = 0; } } return result...

String.prototype.includes() - JavaScript
en string; otherwise, false if not.

String length - JavaScript
the length property of a string object contains the length of the string, in utf-16 code units.

String.prototype.match() - JavaScript
= "nothing will come of nothing."; str.match(); // returns [""] a non-regexp object as the parameter when the regexp parameter is a string or a number, it is implicitly converted to a regexp by using new regexp(regexp).

String.prototype.matchAll() - JavaScript
hall(regexp) parameters regexp a regular expression object.

String.prototype.padStart() - JavaScript
alue is " " (u+0020 'space').

String.prototype.repeat() - JavaScript
ting the number of times to repeat the string.

String.prototype.split() - JavaScript
d array.

String.prototype.startsWith() - JavaScript
t which to begin searching for searchstring.

String.prototype.toSource() - JavaScript
string representing the source code of the calling object.

String.prototype.toUpperCase() - JavaScript
equest.

String.prototype.valueOf() - JavaScript
the valueof() method returns the primitive value of a string object.

Symbol.asyncIterator - JavaScript
console.log(x); // expected output: // "hello" // "async" // "iteration!" } })(); when creating an api, remember that async iterables are designed to represent something iterable — like a stream of data or a list —, not to completely replace callbacks and events in most situations.

Symbol.prototype.toSource() - JavaScript
the tosource() method returns a string representing the source code of the object.

Symbol.toStringTag - JavaScript
tostring.call(null); // "[object null]" // ...

SyntaxError - JavaScript
the syntaxerror object represents an error when trying to interpret syntactically invalid code.

TypedArray.prototype.join() - JavaScript
a string with all array elements joined.

TypedArray.prototype.set() - JavaScript
y.set(typedarray[, offset]) parameters array the array from which to copy values.

TypedArray.prototype.slice() - JavaScript
s not affected.

TypedArray.prototype.some() - JavaScript
ate the typed array on which it is called.

WeakMap - JavaScript
lue pairs in which the keys are weakly referenced.

WebAssembly.CompileError() constructor - JavaScript
age); // "hello" console.log(e.name); // "compileerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifications specification webassembly javascript interfacethe definition of 'webassembly constructors' in that specification.

WebAssembly.CompileError - JavaScript
age); // "hello" console.log(e.name); // "compileerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifications specification webassembly javascript interfacethe definition of 'webassembly constructors' in that specification.

WebAssembly.Instance() constructor - JavaScript
nstance is through the asynchronous webassembly.instantiatestreaming() function, for example like this: const importobject = { imports: { imported_func: function(arg) { console.log(arg); } } }; webassembly.instantiatestreaming(fetch('simple.wasm'), importobject) .then(obj => obj.instance.exports.exported_func()); specifications specification webassembly javascript interfacethe definition of 'instance' in that specification.

WebAssembly.LinkError() constructor - JavaScript
essage); // "hello" console.log(e.name); // "linkerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifications specification webassembly javascript interfacethe definition of 'linkerror' in that specification.

WebAssembly.LinkError - JavaScript
essage); // "hello" console.log(e.name); // "linkerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifications specification webassembly javascript interfacethe definition of 'linkerror' in that specification.

WebAssembly.Memory.prototype.buffer - JavaScript
t memory, then exports a function and uses it to sum some values.

WebAssembly.Memory.prototype.grow() - JavaScript
e instance by one page like so: const bytesperpage = 64 * 1024; console.log(memory.buffer.bytelength / bytesperpage); // "1" console.log(memory.grow(1)); // "1" console.log(memory.buffer.bytelength / bytesperpage); // "2" note the return value of grow() here is the previous number of webassembly pages.

WebAssembly.Module() constructor - JavaScript
console.log(arg); } } }; function createwasmmodule(bytes) { return new webassembly.module(bytes); } fetch('simple.wasm').then(response => response.arraybuffer() ).then(bytes => { let mod = createwasmmodule(bytes); webassembly.instantiate(mod, importobject) .then(result => result.exports.exported_func() ); }) specifications specification webassembly javascript interfacethe definition of 'webassembly.module()' in that specification.

WebAssembly.Module.customSections() - JavaScript
in the example, an arraybuffer object is returned.

WebAssembly.Module.exports() - JavaScript
dule received from main thread'); var mod = e.data; webassembly.instantiate(mod, importobject).then(function(instance) { instance.exports.exported_func(); }); var exports = webassembly.module.exports(mod); console.log(exports[0]); }; the exports[0] output looks like this: { name: "exported_func", kind: "function" } specifications specification webassembly javascript interfacethe definition of 'exports()' in that specification.

WebAssembly.Module.imports() - JavaScript
compiles the loaded simple.wasm module.

WebAssembly.Module - JavaScript
inside it.

WebAssembly.RuntimeError() constructor - JavaScript
age); // "hello" console.log(e.name); // "runtimeerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifications specification webassembly javascript interfacethe definition of 'webassembly.runtimeerror constructor' in that specification.

WebAssembly.RuntimeError - JavaScript
age); // "hello" console.log(e.name); // "runtimeerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifications specification webassembly javascript interfacethe definition of 'webassembly constructors' in that specification.

WebAssembly.Table.prototype.grow() - JavaScript
a new webassembly table instance with an initial size of 2 and a maximum size of 10.

WebAssembly.Table.prototype.length - JavaScript
a new webassembly table instance with an initial size of 2 and a maximum size of 10.

WebAssembly.compile() - JavaScript
postmessage().

WebAssembly.validate() - JavaScript
d converts it into a typed array.

globalThis - JavaScript
ute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

null - JavaScript
the value null represents the intentional absence of any object value.

parseInt() - JavaScript
s a substitute for math.floor().

uneval() - JavaScript
the uneval() function creates a string representation of the source code of an object.

Conditional (ternary) operator - JavaScript
the conditional (ternary) operator is the only javascript operator that takes three operands: a condition followed by a question mark (?), then an expression to execute if the condition is truthy followed by a colon (:), and finally the expression to execute if the condition is falsy.

Less than (<) - JavaScript
/mdn/interactive-examples and send us a pull request.

Object initializer - JavaScript
'foo' let o = { [prop]: 'hey', ['b' + 'ar']: 'there' } description an object initializer is an expression that describes the initialization of an object.

Optional chaining (?.) - JavaScript
e of obj.first.second.

Spread syntax (...) - JavaScript
pread operator, it is assumed another iterating function is used when the merging occurs.

class expression - JavaScript
the class expression is one way to define a class in ecmascript 2015.

delete operator - JavaScript
the javascript delete operator removes a property from an object; if no more references to the same property are held, it is eventually released automatically.

Function expression - JavaScript
erence between a function expression and a function declaration is the function name, which can be omitted in function expressions to create anonymous functions.

instanceof - JavaScript
nt.defaultview.svgelement.

new operator - JavaScript
e of a user-defined object type or of one of the built-in object types that has a constructor function.

export - JavaScript
the export statement is used when creating javascript modules to export live bindings to functions, objects, or primitive values from the module so they can be used by other programs with the import statement.

for...of - JavaScript
.log(entry); } // ['a', 1] // ['b', 2] // ['c', 3] for (const [key, value] of iterable) { console.log(value); } // 1 // 2 // 3 iterating over a set const iterable = new set([1, 1, 2, 2, 3, 3]); for (const value of iterable) { console.log(value); } // 1 // 2 // 3 iterating over the arguments object you can iterate over the arguments object to examine all of the parameters passed into a javascript function: (function() { for (const argument of arguments) { console.log(argument); } })(1, 2, 3); // 1 // 2 // 3 iterating over a dom collection iterating over dom collections like nodelist: the following example adds a read class to paragraphs that are direct descendants of an article: // note: this will only work in platforms that have // implemented nodelist.prototype[symbol.itera...

for - JavaScript
offsetleft, ntop += oitnode.offsettop, oitnode = oitnode.offsetparent /* final-expression */ ); /* semicolon */ console.log('offset position of \'' + sid + '\' element:\n left: ' + nleft + 'px;\n top: ' + ntop + 'px;'); } /* example call: */ showoffsetpos('content'); // output: // "offset position of "content" element: // left: 0px; // top: 153px;" note: this is one of the few cases in javascript where the semicolon is mandatory.

function* - JavaScript
.

function declaration - JavaScript
ypeof foo is ${typeof foo}`); if (true) { function foo(){ return 1; } } // in chrome: // 'foo' name is hoisted.

JavaScript/XSLT Bindings - XSLT: Extensible Stylesheet Language Transformations
javascript/xslt bindings javascript can run xslt transformations through the xsltprocessor object.

The XSLT/JavaScript Interface in Gecko - XSLT: Extensible Stylesheet Language Transformations
introduction javascript/xslt bindings basic example setting parameters advanced example interface list resources ...

Index - Archive of obsolete content
cross-domain content scripts add-on sdk, add-ons, extensions no summary!
... add-on sdk learn how to contribute to the add-on sdk.
...xt-menu add-on sdk, add-ons, extensions, firefox, sdk adds items, submenus, and menu separators to the page's context menu.
...And 239 more matches

Index - Learn web development
# page tags and summary 1 learn web development beginner, css, html, index, intro, landing, learn, web welcome to the mdn learning area.
...pment beginner, css, html, index, intro, landing, learn, web welcome to the mdn learning area.
...vascript, landing, learn, module learning some html, css, and javascript is useful if you want to become a web developer.
...And 191 more matches

LiveConnect Overview - Archive of obsolete content
this chapter describes using liveconnect technology to let java and javascript code communicate with each other.
... this chapter describes using liveconnect technology to let java and javascript code communicate with each other.
... this chapter describes using liveconnect technology to let java and javascript code communicate with each other.
...And 146 more matches

Index
found 550 pages: # page tags and summary 1 spidermonkey: the mozilla javascript runtime spidermonkey standalone source code releases can be found on the releases page.
... found 550 pages: # page tags and summary 1 spidermonkey: the mozilla javascript runtime spidermonkey standalone source code releases can be found on the releases page.
... found 550 pages: # page tags and summary 1 spidermonkey: the mozilla javascript runtime spidermonkey standalone source code releases can be found on the releases page.
...And 137 more matches

Index - MDN Web Docs Glossary: Definitions of Web-related terms
codingscripting, flash, glossary, infrastructure flash is an obsolescent technology developed by adobe for viewing expressive web applications, multimedia content, and streaming media.
... apple safari glossary, navigation, webmechanics safari is a web browser developed by apple and bundled with both macos and ios.
... as a robust medium to transmit sensitive military data and to connect leading research groups throughout the united states.
...And 112 more matches

Index - Web APIs
ontimeline.currenttime api, animation, animationtimeline, experimental, property, read-only, reference, web animations, currenttime, waapi, web animations api the currenttime read-only property of the web animations api's animationtimeline interface returns the timeline's current time in milliseconds, or null if the timeline is inactive.
...eb animations, currenttime, waapi, web animations api the currenttime read-only property of the web animations api's animationtimeline interface returns the timeline's current time in milliseconds, or null if the timeline is inactive.
...onds of processing latency incurred by the audiocontext passing the audio from the audiodestinationnode to the audio subsystem.
...And 111 more matches

JSAPI User Guide
this document explains how to embed spidermonkey, the mozilla javascript engine, in your c++ program.
... this document explains how to embed spidermonkey, the mozilla javascript engine, in your c++ program.
... this document explains how to embed spidermonkey, the mozilla javascript engine, in your c++ program.
...And 68 more matches

Index - Game development
found 74 pages: # page tags and summary 1 game development apps, game development, gamedev, games, html5 games, javascript games, web gaming is one of the most popular computer activities.
... tags and summary 1 game development apps, game development, gamedev, games, html5 games, javascript games, web gaming is one of the most popular computer activities.
...g) to make.
...And 65 more matches

Index
found 1275 pages: # page tags and summary 1 xpcom add-ons, extensions, landing, mozilla, xpcom xpcom is a cross platform component object model, similar to microsoft com.
...terfaces and those interfaces can change between gecko versions.
...ct as one of the arguments to the window creation method.
...And 62 more matches

Migrate apps from Internet Explorer to Mozilla - Archive of obsolete content
m level 1, dom level 2 and parts of dom level 3 mathematical markup language: mathml version 2.0 extensible markup language (xml): xml 1.0, namespaces in xml, associating style sheets with xml documents 1.0, fragment identifier for xml xsl transformations: xslt 1.0 xml path language: xpath 1.0 resource description framework: rdf simple object access protocol: soap 1.1 ecma-262, revision 3 (javascript 1.5): ecma-262 general cross-browser coding tips even though web standards do exist, different browsers behave differently (in fact, the same browser may behave differently depending on the platform).
...v:1.5) gecko/20031016 while using the useragent to sniff the browser provides detailed information on the browser in use, code that handles useragents often can make mistakes when new browser versions arrive, thus requiring code changes.
...andard method, such as opera or safari, to work without any changes.
...And 53 more matches

JSAPI reference
the jsapi is the c++ api for the spidermonkey javascript engine.
...rivate js_getsecondcontextprivate added in spidermonkey 17 js_setsecondcontextprivate added in spidermonkey 17 js_setinterruptcallback added in spidermonkey 31 js_getinterruptcallback added in spidermonkey 31 js_requestinterruptcallback added in spidermonkey 31 js_checkforinterrupt added in jsapi 45 js_destroycontextmaybegc obsolete since jsapi 14 js_setbranchcallback obsolete since javascript 1.9.1 js_setoperationcallback obsolete since jsapi 30 js_getoperationcallback obsolete since jsapi 30 js_triggeroperationcallback obsolete since jsapi 30 js_clearoperationcallback obsolete since javascript 1.9.1 js_getoperationlimit obsolete since javascript 1.9.1 js_setoperationlimit obsolete since javascript 1.9.1 js_max_operation_limit obsolete since javascript 1.9.1 js_operation_weigh...
...ncallback obsolete since jsapi 30 js_getoperationcallback obsolete since jsapi 30 js_triggeroperationcallback obsolete since jsapi 30 js_clearoperationcallback obsolete since javascript 1.9.1 js_getoperationlimit obsolete since javascript 1.9.1 js_setoperationlimit obsolete since javascript 1.9.1 js_max_operation_limit obsolete since javascript 1.9.1 js_operation_weight_base obsolete since javascript 1.9.1 js_setthreadstacklimit obsolete since jsapi 13 js_setscriptstackquota obsolete since javascript 1.8.6 js_setoptions obsolete since jsapi 27 js_getoptions obsolete since jsapi 27 js_toggleoptions obsolete since jsapi 27 enum jsversion jsversion_ecma_3 jsversion_1_6 jsversion_1_7 jsversion_1_8 jsversion_ecma_5 jsversion_default jsversion_unknown jsversi...
...And 52 more matches

Introduction to client-side frameworks - Learn web development
overview: client-side javascript frameworks next we begin our look at frameworks with a general overview of the area, looking at a brief history of javascript and frameworks, why frameworks exist and what they give us, how to start thinking about choosing a framework to learn, and what alternatives there are to client-side frameworks.
...client-side javascript frameworks next we begin our look at frameworks with a general overview of the area, looking at a brief history of javascript and frameworks, why frameworks exist and what they give us, how to start thinking about choosing a framework to learn, and what alternatives there are to client-side frameworks.
...with a general overview of the area, looking at a brief history of javascript and frameworks, why frameworks exist and what they give us, how to start thinking about choosing a framework to learn, and what alternatives there are to client-side frameworks.
...And 42 more matches

JXON - Archive of obsolete content
jxon (lossless javascript xml object notation) is a generic name by which is defined the representation of javascript objects using xml.
... jxon (lossless javascript xml object notation) is a generic name by which is defined the representation of javascript objects using xml.
...sion, but some conventions begin to appear on the web.
...And 40 more matches

Reference - Archive of obsolete content
t" and "context object".
...ctions and variables.
...it).
...And 40 more matches

Scripting Java
this article shows how to use rhino to reach beyond javascript into java.
...s that use it.
...lass java.io.file using just the name file: js> importpackage(java.io) js> file [javaclass java.io.file] here importpackage(java.io) makes all the classes in the java.io package (such as file) available at the top level.
...And 39 more matches

Understanding WebAssembly text format - WebAssembly
able webassembly to be read and edited by humans, there is a textual representation of the wasm binary format.
...rs, browser developer tools, etc.
... is related to the underlying bytecode it represents — and the wrapper objects representing wasm in javascript.
...And 38 more matches

JSObject - Archive of obsolete content
summary the public final class netscape.javascript.jsobject extends object.
... summary the public final class netscape.javascript.jsobject extends object.
... summary the public final class netscape.javascript.jsobject extends object.
...And 36 more matches

Index - Firefox Developer Tools
found 158 pages: # page tags and summary 1 firefox developer tools developing mozilla, guide, tools, web development, web development:tools, l10n:priority firefox developer tools is a set of web developer tools built into firefox.
...irefox, guide, manifest in this article we will look at inspecting app manifests using the firefox devtools application panel.
...sing the firefox devtools application panel.
...And 35 more matches

Working with JSON - Learn web development
previous overview: objects next javascript object notation (json) is a standard text-based format for representing structured data based on javascript object syntax.
...t object notation (json) is a standard text-based format for representing structured data based on javascript object syntax.
...ding some data from the server to the client, so it can be displayed on a web page, or vice versa).
...And 33 more matches

JSAPI Cookbook
this article shows the jsapi equivalent for a tiny handful of common javascript idioms.
...quivalent for a tiny handful of common javascript idioms.
...ng(); bool isnumber = v.isnumber(); bool isint32 = v.isint32(); // note: internal representation, not numeric value bool isnull = v.isnull(); bool isboolean = v.isboolean(); bool isobject = v.isobject(); // note: not broken like typeof === "object" is :-) to set a value use a correspondingly named member mutator function, or assign the result of the correspondingly named standalone function: // javascript var v; v = 0; v = 0.5; v = somestring; v = null; v = undefined; v = false; /* jsapi */ js::rootedvalue v(cx); js::rootedstring somestring(cx, ...); v.setint32(0); // or: v = js::int32value(0); v.setdouble(0.5); // or: v = js::doublevalue(0.5); v.setstring(somestring); // or: v = js::stringvalue(somestring); v.setnull(); // or: v = js::nullvalue(); v.setundefined();...
...And 32 more matches

Tutorials
@font-face feature from css3 allows you to use custom typefaces on the web in an accessible, manipulatable, and scalable way.
...e custom typefaces on the web in an accessible, manipulatable, and scalable way.
...ccessible, manipulatable, and scalable way.
...And 32 more matches

WebAssembly Concepts - WebAssembly
he web platform — it provides a way to run code written in multiple languages on the web at near-native speed, with client apps running on the web that previously couldn’t have done so.
...orm — it provides a way to run code written in multiple languages on the web at near-native speed, with client apps running on the web that previously couldn’t have done so.
...debugged by hand.
...And 31 more matches

Storing the information you need — Variables - Learn web development
previous overview: first steps next after reading the last couple of articles you should now know what javascript is, what it can do for you, how you use it alongside other web technologies, and what its main features look like from a high level.
... previous overview: first steps next after reading the last couple of articles you should now know what javascript is, what it can do for you, how you use it alongside other web technologies, and what its main features look like from a high level.
...ascript is, what it can do for you, how you use it alongside other web technologies, and what its main features look like from a high level.
...And 27 more matches

Using XPCOM Components
ever a user accesses the cookie manager dialog to view, organize, or remove cookies that have been stored on the system, they are using the cookiemanager component behind the scenes.
...ions are private[private-xpcom-interfaces].
... list and then clicks the remove button, the remove method in the nsicookiemanager interface is called.
...And 27 more matches

Introduction to web APIs - Learn web development
overview: client-side web apis next first up, we'll start by looking at apis from a high level — what are they, how do they work, how to use them in your code, and how are they structured?
...t up, we'll start by looking at apis from a high level — what are they, how do they work, how to use them in your code, and how are they structured?
... don't try to wire it directly into the power supply — to do so would be really inefficient and, if you are not an electrician, difficult and dangerous to attempt.
...And 26 more matches

Introduction to Web development - Developer guides
basic concepts and fundamentals css reference guide — a complete guide to css with details on the level of gecko/firefox support for each.
...— a complete guide to css with details on the level of gecko/firefox support for each.
... css with details on the level of gecko/firefox support for each.
...And 26 more matches

MCD, Mission Control Desktop, AKA AutoConfig - Archive of obsolete content
ult/randomdir/prefs.js) we now use a centralized default set of preferences.
...ed preference file can lock preferences (lockpref) or initialize them (defaultpref) based on environment variables (user, home...) and/or ldap queries (fetch email address, common name , language, homepage etc...) from the enterprise directory.
...t/pref ( it used to be in /usr/lib/thunderbird-version#/default/pref as in /usr/lib/thunderbird-5/default/pref ) for the record/history purpose ...
...And 24 more matches

Browser Detection and Cross Browser Support - Archive of obsolete content
browser detection.
...a, and netscape browsers, far fewer are aware that these browsers are members of an entire family of user agents based upon the gecko layout engine which includes the commercial browser compuserve 7, and open source browsers such as epiphany, galeon, camino, kmeleon, and seamonkey.
...using mozilla/version to signal that they were compatible with a particular netscape version.
...And 24 more matches

Client-side storage - Learn web development
is modern web browsers support a number of ways for web sites to store data on the user's computer — with the user's permission — then retrieve it when necessary.
... web sites to store data on the user's computer — with the user's permission — then retrieve it when necessary.
...dynamic sites.
...And 24 more matches

Window.open() - Web APIs
f the developer has access only to its name (the name can be saved with cookies or local storage but not the window object handle).
...quest's referrer set to noreferrer; this prevents the request from sending the url of the page that initiated the request to the server where the request is sent.
...="this link will create a new window or will re-use an already opened one" >promote firefox adoption</a></p> the above code solves a few usability problems related to links opening secondary window.
...And 24 more matches

Adobe Flash - Archive of obsolete content
this document is out of date.
... this document is out of date.
... this document is out of date.
...And 23 more matches

Mozilla DOM Hacking Guide
so important for the dom.
...tion or de facto standard".
...see that class info is mainly used to implement the dom level 0.
...And 23 more matches

Rhino overview
introduction most people who have used javascript before have done so by adding scripts to their html web pages.
... introduction most people who have used javascript before have done so by adding scripts to their html web pages.
... introduction most people who have used javascript before have done so by adding scripts to their html web pages.
...And 23 more matches

Drawing graphics - Learn web development
previous overview: client-side web apis next the browser contains some very powerful graphics programming tools, from the scalable vector graphics (svg) language, to apis for drawing on html <canvas> elements, (see the canvas api and webgl).
...side web apis next the browser contains some very powerful graphics programming tools, from the scalable vector graphics (svg) language, to apis for drawing on html <canvas> elements, (see the canvas api and webgl).
...nguage, to apis for drawing on html <canvas> elements, (see the canvas api and webgl).
...And 22 more matches

Getting started with Svelte - Learn web development
previous overview: client-side javascript frameworks next in this article we'll provide a quick introduction to the svelte framework.
...ee how svelte works and what sets it apart from the rest of the frameworks and tools we've seen so far.
...evelopment environment, create a sample app, understand the structure of the project, and see how to run it locally and build it for production.
...And 22 more matches

Chapter 5: Let's build a Firefox extension - Archive of obsolete content
ument was authored by taiga (gomita) gomibuchi and was originally published in japanese for the firefox developers conference summer 2007.
...l_cache (not present in firefox 3.5+) ordinarily, firefox will cache xul documents after they have been read in once, to speed subsequent displays.
...x will cache xul documents after they have been read in once, to speed subsequent displays.
...And 21 more matches

Appendix D: Loading Scripts - Archive of obsolete content
most add-ons and xul runner applications provide their primary functionality by loading and executing javascript code.
... most add-ons and xul runner applications provide their primary functionality by loading and executing javascript code.
...ity: the simple, declarative nature of these tags make them easy to find and understand at a glance.
...And 21 more matches

Processing XML with E4X - Archive of obsolete content
warning: e4x is obselete.
... warning: e4x is obselete.
... warning: e4x is obselete.
...And 21 more matches

Implementing feature detection - Learn web development
depending on whether it does (or doesn't), so that the browser can always provide a working experience rather than crashing/erroring in some browsers.
..., how to use a library to speed up implementation, and native features for feature detection such as @supports.
...t browser, and then conditionally run code to provide an acceptable experience both in browsers that do support the feature, and browsers that don't.
...And 21 more matches

How to build custom form controls - Learn web development
we will discuss how to build a custom control.
...ontrol's basic functionality has been decided upon, it's time to start building it.
...t with the form data --> <li class="option">cherry</li> <li class="option">lemon</li> <li class="option">banana</li> <li class="option">strawberry</li> <li class="option">apple</li> </ul> </div> note the use of class names; these identify each relevant part regardless of the actual underlying html elements used.
...And 20 more matches

Venkman Introduction - Archive of obsolete content
warning: the content of this article may be out of date.
...ticle may be out of date.
...efox, mozilla suite and netscape 7.x.
...And 19 more matches

Introduction to events - Learn web development
, if the user selects a button on a webpage, you might want to respond to that action by displaying an information box.
...hooses a key on the keyboard.
...un in response to an event, we say we are registering an event handler.
...And 19 more matches

Getting started with React - Learn web development
previous overview: client-side javascript frameworks next in this article we will say hello to react.
...erview: client-side javascript frameworks next in this article we will say hello to react.
...eact.
...And 19 more matches

Tutorial: Embedding Rhino
edder, the objects exposed to scripts can be customized further.
...code will be in green, java code will be in green, and shell logs will be in purple.
...in green, and shell logs will be in purple.
...And 19 more matches

Language bindings
s exist to access these modules.
...x using c or c++.
...ts object is actually a native instance of the nsixpccomponents interface which is reflected into javascript as a top level object using xpconnect.components.classescomponents.classes is a read-only object whose properties are classes indexed by contractid.components.classesbyidcomponents.classesbyid is a read-only object whose properties are classes indexed by cid.components.constructorcreates a javascript function which can be used to create or construct new instances of xpcom components.components.exceptioncomponents.exception is a javascript constructor to create nsixpcexception objects.
...And 19 more matches

Framework main features - Learn web development
previous overview: client-side javascript frameworks next each major javascript framework has a different approach to updating the dom, handling browser events, and providing an enjoyable developer experience.
...ks next each major javascript framework has a different approach to updating the dom, handling browser events, and providing an enjoyable developer experience.
... main features of “the big 4” frameworks, looking at how frameworks tend to work from a high level, and the differences between them.
...And 18 more matches

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.
...e applications.
...ial.git then to get to the current app state, run cd mdn-svelte-tutorial/07-typescript-support or directly download the folder's content: npx degit opensas/mdn-svelte-tutorial/07-typescript-support remember to run npm install && npm run dev to start your app in development mode.
...And 18 more matches

Inner-browsing extending the browser navigation paradigm - Archive of obsolete content
ntinuity, precision and control.
...in which developers format text layouts into pages and link those pages to related content, is analogous to a book or a magazine: readers view pages, go to other pages for more information, and view resources listed as references on that page.
...ve a new page with the next block of message headers.
...And 17 more matches

Introduction to XUL - Archive of obsolete content
platform).
...ich walks the content model after it has been built from xul, and hooks up event listeners.
... without affecting the xul source.
...And 17 more matches

Xray vision
xray vision helps javascript running in a privileged security context safely access objects created by less privileged code, by showing the caller only the native version of the objects.
... xray vision helps javascript running in a privileged security context safely access objects created by less privileged code, by showing the caller only the native version of the objects.
... xray vision helps javascript running in a privileged security context safely access objects created by less privileged code, by showing the caller only the native version of the objects.
...And 17 more matches

Debugger.Source - Firefox Developer Tools
debugger.source a debugger.source instance represents either a piece of javascript source code or the serialized text of a block of webassembly code.
...e property always being "wasm" and the former having its introductiontype property never being "wasm".
...ontype property never being "wasm".
...And 17 more matches

WAI-ARIA basics - Learn web development
previous overview: accessibility next following on from the previous article, sometimes making complex ui controls that involve unsemantic html and dynamic javascript-updated content can be difficult.
...c javascript-updated content can be difficult.
... to feature complex controls like date pickers for choosing dates, sliders for choosing values, etc.
...And 16 more matches

Client-side form validation - Learn web development
to ensure all required form controls are filled out, in the correct format.
... malformed input on the client-side, a malicious user can still alter the network request.
...lter the network request.
...And 16 more matches

Object prototypes - Learn web development
previous overview: objects next prototypes are the mechanism by which javascript objects inherit features from one another.
... previous overview: objects next prototypes are the mechanism by which javascript objects inherit features from one another.
...plain how prototype chains work and look at how the prototype property can be used to add methods to existing constructors.
...And 16 more matches

Setting up an extension development environment - Archive of obsolete content
s.) you'll see the list of available user profiles one which is default (stable) and other (unstable) profile(s) created automatically when you run other versions of firefox earlier.
...boolean) entries for them.
...ndows and dialogs do not require a restart.
...And 15 more matches

Handling common accessibility problems - Learn web development
previous overview: cross browser testing next next we turn our attention to accessibility, providing information on common problems, how to do simple testing, and how to make use of auditing/automation tools for finding accessibility issues.
...y pressing the tab key; after a few presses, you should see the tab focus start to move through the different focusable elements; the focused elements are given a highlighted default style in every browser (it differs slightly between different browsers) so that you can tell what element is focused.
...ghlight each item on a webpage checkbox.
...And 15 more matches

Introducing a complete toolchain - Learn web development
s of building up a sample case study toolchain.
... apis) concerning potentially hazardous space objects that threaten our existence on earth!
...oolchain in this article we're going to use the following tools and features: jsx, a react-related set of syntax extensions that allow you to do things like defining component structures inside javascript.
...And 15 more matches

Rhino Debugger
the rhino javascript debugger is a gui that allows debugging of interpreted javascript scripts run in rhino.
... the rhino javascript debugger is a gui that allows debugging of interpreted javascript scripts run in rhino.
... the rhino javascript debugger is a gui that allows debugging of interpreted javascript scripts run in rhino.
...And 15 more matches

Working with windows in chrome code
d parameter is the window's name; the name can be used in links or forms as the target attribute.
...element inside your document.
...ument to access that document and browser.contentwindow to access the window object of that document.
...And 15 more matches

Working with data
creating cdata objects data types for use with js-ctypes are represented by ctype objects.
...ject, the original object is simply duplicated directly into the new one.
...s new arraytype(type.elementtype, value).
...And 15 more matches

Mozilla
bug builds (--enable-debug) and non-optimized builds (--disable-optimize) are much slower.
...ed builds (--disable-optimize) are much slower.
... desirable to fully employ the kde wallet manager, rather than any secondary replacements of kdewallet.
...And 15 more matches

Debugger-API - Firefox Developer Tools
the debugger interface mozilla’s javascript engine, spidermonkey, provides a debugging interface named debugger which lets javascript code observe and manipulate the execution of other javascript code.
... the debugger interface mozilla’s javascript engine, spidermonkey, provides a debugging interface named debugger which lets javascript code observe and manipulate the execution of other javascript code.
... other javascript code.
...And 15 more matches

Waterfall - Firefox Developer Tools
the waterfall gives you insight into the sorts of things the browser is doing as it runs your site or app.
...ecution.
...perations are color-coded and labeled.
...And 15 more matches

Using Web Workers - Web APIs
web workers are a simple means for web content to run scripts in background threads.
...t (although the responsexml and channel attributes are always null).
...awn new workers, as long as those workers are hosted within the same origin as the parent page.
...And 15 more matches

Compiling from Rust to WebAssembly - WebAssembly
ust code, you can compile it into webassembly (wasm).
... web app based in rust.
... } #[wasm_bindgen] pub fn greet(name: &str) { alert(&format!("hello, {}!", name)); } this is the contents of our rust project.
...And 15 more matches

Functions — reusable blocks of code - Learn web development
inside a defined block, and then call that code whenever you need it using a single short command — rather than having to type out the same code multiple times.
...mmand — rather than having to type out the same code multiple times.
...ple times.
...And 14 more matches

Silly story generator - Learn web development
view: first steps in this assessment you'll be tasked with taking some of the knowledge you've picked up in this module's articles and applying it to creating a fun app that generates random silly stories.
...ndex.html in a new directory somewhere on your computer, and do the assessment locally to begin with.
...is also has the css to style the example contained within it.
...And 14 more matches

Getting started with Ember - Learn web development
previous overview: client-side javascript frameworks next in our first ember article we will look at how ember works and what it's useful for, install the ember toolchain locally, create a sample app, and then do some initial setup to get it ready for development.
... previous overview: client-side javascript frameworks next in our first ember article we will look at how ember works and what it's useful for, install the ember toolchain locally, create a sample app, and then do some initial setup to get it ready for development.
...will look at how ember works and what it's useful for, install the ember toolchain locally, create a sample app, and then do some initial setup to get it ready for development.
...And 14 more matches

Performance best practices for Firefox front-end engineers
which is as performant as possible—not just on its own, but in terms of its impact on other parts of firefox.
...y of this page from our friends at google, which itself is well worth the read.
...ot a good place to put queries for layout or style information.
...And 14 more matches

nsIJSON
dom/interfaces/json/nsijson.idlscriptable this interface provides a convenient way to encode and decode json strings from javascript code.
... dom/interfaces/json/nsijson.idlscriptable this interface provides a convenient way to encode and decode json strings from javascript code.
...tring str); deprecated since gecko 2.0 jsval legacydecodefromstream(in astring str); deprecated since gecko 2.0 jsval legacydecodetojsval(in astring str, in jscontext cx); native code only!
...And 14 more matches

Web Performance
atency by making the experience as available and interactive as possible, as soon as possible, while asynchronously loading in the longer tail parts of the experience.
..., <video>, animated gifs and even animated pngs and other image types.
...er struggles to hit a smooth frame rate.critical rendering paththe critical rendering path is the sequence of steps the browser goes through to convert the html, css, and javascript into pixels on the screen.
...And 14 more matches

Venkman - Archive of obsolete content
venkman is the code name for mozilla's javascript debugger.
... venkman is the code name for mozilla's javascript debugger.
...netscape 7.x/9.x and seamonkey.
...And 13 more matches

JavaArray - Archive of obsolete content
summary core object a wrapped java array accessed from within javascript code is a member of the type javaarray.
... of the type javaarray.
...rbitrary data type using the newinstance method of the array class: public static object newinstance(class componenttype, int length) throws negativearraysizeexception description the javaarray object is an instance of a java array that is created in or passed to javascript.
...And 13 more matches

Manipulating documents - Learn web development
lly done by using the document object model (dom), a set of apis for controlling html and styling information that makes heavy use of the document object.
...ument object model (dom), a set of apis for controlling html and styling information that makes heavy use of the document object.
...tml, css, and javascript — including javascript objects.
...And 13 more matches

Server-side web frameworks - Learn web development
ariable_name }}), which will be replaced by values passed in from the view function when a page is rendered.
... will be replaced by values passed in from the view function when a page is rendered.
...s.
...And 13 more matches

XPCOM changes in Gecko 2.0
w to update your code.
... and you can actually support both types of registration for backward compatibility.
...n for backward compatibility.
...And 13 more matches

Authoring MathML - MathML
ns, wysiwyg editors and other content management systems to help writing web pages.
... developing texzilla, a javascript unicode latex-to-mathml converter that is intended to be used in many scenarios described here.
...over, a latex-to-mathml input box has also been integrated into seamonkey since version 2.28 and into thunderbird since version 31.
...And 13 more matches

Using XPInstall to Install Plugins - Archive of obsolete content
parts of this page show the use of the xpinstall api.
... is about how you can use xpinstall to install plugins to the browsers that support xpinstall.
...where to install the software, and what messages to feed to the user.
...And 12 more matches

Client-side tooling overview - Learn web development
overview: understanding client-side tools next in this article we provide an overview of modern web tooling, what kinds of tools are available and where you’ll meet them in the lifecycle of web app development, and how to find help with individual tools.
...ls.
...les will go beyond that, focusing on developer tools that help you produce web code more efficiently.
...And 12 more matches

Components object
y intended for code running with chrome privileges.
... object on your web page, your site might break at any time!
...nterfaces by interface name interfacesbyid array of interfaces by iid issuccesscode function to determine if a given result code is a success code lastresult result code of most recent xpconnect call manager the global xpcom component manager results array of known result codes by name returncode pending result for current call stack current javascript call stack utils provides access to several useful features utils.atline provides access to the value of the atline property in the javascript environment.
...And 12 more matches

Compiling a New C/C++ Module to WebAssembly - WebAssembly
ten sdk, using these instructions: https://emscripten.org/docs/getting_started/downloads.html compiling an example with the environment set up, let's look at how to use it to compile a c example to emscripten.
...mple with the environment set up, let's look at how to use it to compile a c example to emscripten.
...t to compile a c example to emscripten.
...And 12 more matches

Chapter 2: Technologies used in developing extensions - Archive of obsolete content
ies widely used on the web.
...e interest of brevity, i will omit explanations of widely understood technologies, and focus instead on introducing new technologies you will need to understand in order to develop for firefox.
...better than it is when structural and stylistic markup are both embedded in html.
...And 11 more matches

SeaMonkey - making custom toolbar (SM ver. 1.x) - Archive of obsolete content
page: custom toolbar button) you do not need any special technical skills or tools, and almost all the information you need is on this page.
...stalled seamonkey: 1.
...you can use the following method to find it.
...And 11 more matches

Archived open Web documentation - Archive of obsolete content
ions (deprecated) firefox offers support for "desktop notifications"; these are notifications that are displayed to the user outside the context of the web content, using the standard notification system provided by the operating system.
...al is to provide an alternative, simpler syntax for accessing xml documents than via dom interfaces.
... the iterator function returns an object which implements legacy iterator protocol and iterates over enumerable properties of an object.
...And 11 more matches

What are browser developer tools? - Learn web development
every modern web browser includes a powerful suite of developer tools.
...you are inspecting uses css grid, this section allows you to view the grid details.
...ss grid, this section allows you to view the grid details.
...And 11 more matches

Dynamic behavior in Svelte: working with variables and props - Learn web development
previous overview: client-side javascript frameworks next now that we have our markup and styles ready we can start developing the required features for our svelte to-do list app.
... now that we have our markup and styles ready we can start developing the required features for our svelte to-do list app.
...erequisites: 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.
...And 11 more matches

Handling common HTML and CSS problems - Learn web development
lems you will come across in html and css code, and what tools can be used to prevent problems from happening, or fix problems that occur.
...wser problems, and use appropriate tools and techniques to fix them.
... linters another good option to choose is a so-called linter application, which not only points out errors, but can also flag up warnings about bad practices in your css, and other points besides.
...And 11 more matches

XPCOMUtils.jsm
the xpcomutils.jsm javascript code module offers utility routines for javascript components loaded by the javascript component loader.
... the xpcomutils.jsm javascript code module offers utility routines for javascript components loaded by the javascript component loader.
... the xpcomutils.jsm javascript code module offers utility routines for javascript components loaded by the javascript component loader.
...And 11 more matches

Rhino shell
the javascript shell provides a simple way to run scripts in batch mode or an interactive environment for exploratory programming.
... the javascript shell provides a simple way to run scripts in batch mode or an interactive environment for exploratory programming.
... the javascript shell provides a simple way to run scripts in batch mode or an interactive environment for exploratory programming.
...And 11 more matches

Building the WebLock UI
er can click to access the web lock interface.
...e web locking of the browser.
... to the lock and unlock methods of the weblock component must also adjust this variable accordingly: function wlock() { // check to see if locking is on or off weblock.lock(); wlocked = 1; } function wunlock() { // check to see if locking is on or off weblock.unlock(); wlocked = 0; } an important preliminary of these functions is that the weblock component be made available to the javascript in the form of the weblock object being used in the snippets above.
...And 11 more matches

nsIPromptService
ast changed in gecko 1.7.5 you can define access keys (or keyboard shortcuts) for buttons by including an ampersand ("&") in front of the character that should be the access key for that button.
...s text, use two of them, like this: "&&".
... select(in nsidomwindow aparent, in wstring adialogtitle, in wstring atext, in pruint32 acount, [array, size_is(acount)] in wstring aselectlist, out long aoutselection); constants the following flags are combined to form the abuttonflags parameter passed to confirmex.
...And 11 more matches

nsIScriptError
js/xpconnect/idl/nsiscripterror.idlscriptable represents javascript errors and warnings for use by the console service.
... unsigned long long the window id with which the error is associated.
...t() instead of initwithwindowid().
...And 11 more matches

Migrating from Firebug - Firefox Developer Tools
tools share the same shortcuts, but also provide shortcuts for the different panels.
...y wrapped event listeners (e.g.
...ors or xpaths firebug allows to search for elements within the html panel via css selectors or xpaths.
...And 11 more matches

<script>: The Script element - HTML: Hypertext Markup Language
the html <script> element is used to embed executable code or data; this is typically used to embed or refer to javascript code.
... the html <script> element is used to embed executable code or data; this is typically used to embed or refer to javascript code.
...hen the classic script will be fetched in parallel to parsing and evaluated as soon as it is available.
...And 11 more matches

WebAssembly
webassembly is a new type of code that can be run in modern web browsers — it is a low-level assembly-like language with a compact binary format that runs with near-native performance and provides languages such as c/c++, c# and rust with a compilation target so that they can run on the web.
... run on the web.
...to run alongside javascript, allowing both to work together.
...And 11 more matches

Classes and Inheritance - Archive of obsolete content
efines one or more members, which are initialized to a given value when the class is instantiated.
...e and behavior from an existing classes, known as the base class.
...unt of boilerplate code.
...And 10 more matches

Creating custom Firefox extensions with the Mozilla build system - Archive of obsolete content
there is a wealth of material on creating extensions for firefox.
...s for firefox.
...nents in c++ that provide additional functionality.
...And 10 more matches

Practical positioning examples - Learn web development
"single page apps" are becoming very popular — especially for mobile web uis — because having everything served as a single file cuts down on the number of http requests required to view all the content, thereby improving performance.
... on the number of http requests required to view all the content, thereby improving performance.
...click on for displaying our content panels.
...And 10 more matches

HTML forms in legacy browsers - Learn web development
e always side effects.
...rrounding items.
...dget, you can check to see if the browser supports the features you plan on using using @supports: @supports (appearance: none) { input[type="search"] { appearance: none; /* restyle the search input */ } theappearance property can be used to display an element using platform-native styling, or, as is done with the value of none, remove default platform-native based styling.
...And 10 more matches

General asynchronous programming concepts - Learn web development
overview: asynchronous next in this article, we'll run through a number of important concepts relating to asynchronous programming, and how this looks in web browsers and javascript.
... overview: asynchronous next in this article, we'll run through a number of important concepts relating to asynchronous programming, and how this looks in web browsers and javascript.
...us programming, and how this looks in web browsers and javascript.
...And 10 more matches

Package management basics - Learn web development
previous overview: understanding client-side tools next in this article we'll look at package managers in some detail to understand how we can use them in our own projects — to install project tool dependencies, keep them up-to-date, and more.
...man-readable text.
...ithout modern build tools, dependencies like this might be included in your project using a simple <script> element, but this might not work right out of the box and you will likely need some modern tooling to bundle your code and dependencies together when they are released on the web.
...And 10 more matches

SpiderMonkey Internals
this document is talking about partially obsolete things.
... talking about partially obsolete things.
...ious extensions, and a few public apis.
...And 10 more matches

SpiderMonkey 1.8
the mozilla javascript team is pleased to announce the release of spidermonkey 1.8 release candidate 1.
... the mozilla javascript team is pleased to announce the release of spidermonkey 1.8 release candidate 1.
...87e9724d964e).
...And 10 more matches

ctypes
nt16_t unsigned 16-bit integer.
...2_t unsigned 32-bit integer.
...ger.
...And 10 more matches

Introduction to the DOM - Web APIs
mming languages can connect to the page.
...bject-by-object reference to the dom.
...k together.
...And 10 more matches

Index - XSLT: Extensible Stylesheet Language Transformations
your server needs to send both the source and the stylesheet with a xml mime type, text/xml or application/xml.
... index, reference, xslt found 54 pages: 4 pi parameters xslt no summary!
...an xml file and apply a xsl transformation on it.
...And 10 more matches

Index - WebAssembly
tags and summary 1 webassembly landing, webassembly, wasm webassembly is a new type of code that can be run in modern web browsers — it is a low-level assembly-like language with a compact binary format that runs with near-native performance and provides languages such as c/c++ with a compilation target so that they can run on the web.
...t can be run in modern web browsers — it is a low-level assembly-like language with a compact binary format that runs with near-native performance and provides languages such as c/c++ with a compilation target so that they can run on the web.
...t format, wabt, wasm, wast2wasm, wat2wasm webassembly has an s-expression-based textual representation, an intermediate form designed to be exposed in text editors, browser developer tools, etc.
...And 10 more matches

LiveConnect - Archive of obsolete content
liveconnect provides javascript with the ability to call methods of java classes and vice-versa using the existing java infrastructure.
... liveconnect provides javascript with the ability to call methods of java classes and vice-versa using the existing java infrastructure.
...veconnect functionality is provided solely by the oracle's java plugin.
...And 9 more matches

Rhino serialization
beginning with rhino 1.5 release 3 it is possible to serialize javascript objects, including functions and scripts.
...owever, serialization of code in compilation mode has some significant limitations.
...save the state of an object and write it out to a file or send it across a network connection.
...And 9 more matches

SpiderMonkey 1.8.5
note that version 1.8.5 is outdated.
... note that version 1.8.5 is outdated.
... is the javascript engine that shipped in firefox 4.0.
...And 9 more matches

WebIDL bindings
ds of interface types in the webidl bindings.
...d on an attribute and indicates that another property with the specified name will also appear on the interface prototype object and will call the same underlying c++ implementation for the getter and setter.
...that doresolve might resolve.
...And 9 more matches

Debugger.Memory - Firefox Developer Tools
debugger.memory the debugger api can help tools observe the debuggee’s memory use in various ways: it can mark each new object with the javascript call stack at which it was allocated.
... debugger.memory the debugger api can help tools observe the debuggee’s memory use in various ways: it can mark each new object with the javascript call stack at which it was allocated.
...ompute a census of items belonging to the debuggee, categorizing items in various ways, and yielding item counts.
...And 9 more matches

Web applications and ARIA FAQ - Accessibility
including those who use assistive technologies such as screen readers or magnifiers.
...riven applications and widgets to interoperate with a variety of desktop-based assistive technologies.
... aria supported?
...And 9 more matches

Populating the page: how browsers work - Web Performance
rowser receives the first chunk of data, it can begin parsing the information received.
...he browser will begin parsing and attempting to render an experience based on the data it has.
...fer attribute—block rendering, and pause the parsing of html.
...And 9 more matches

Custom toolbar button - Archive of obsolete content
monkey.) you do not need any special technical skills or tools, and almost all the information you need is on this page.
...med button.xul.
...button" /> </overlay> optionally customize the file by changing the label and tooltiptext in the last section.
...And 8 more matches

Windows Media in Netscape - Archive of obsolete content
ltimedia experiences that script the windows media player in netscape 7.1, just as they do in internet explorer.
... also interact closely with the scripts in a web page.
...e embedding of the windows media player control using a java applet.
...And 8 more matches

Common causes of memory leaks in extensions - Extensions
windows.push(contentwindow); } this will keep the content window compartments alive until the browser window is closed.
...dow compartments alive until the browser window is closed.
...o ensure your code won't accidentally leak content windows.
...And 8 more matches

Front-end web developer - Learn web development
you go along.
...gned to test your knowledge of the subject matter.
...odules css first steps (10–15 hour read/exercises) css building blocks (35–45 hour read/exercises) styling text (15–20 hour read/exercises) css layout (30–40 hour read/exercises) additional resources css layout cookbook interactivity with javascript time to complete: 135–185 hours prerequisites it is recommended that you have basic html knowledge before starting to learn javascript.
...And 8 more matches

Tips for authoring fast-loading HTML pages - Learn web development
g page weight through the elimination of unnecessary whitespace and comments, commonly known as minimization, and by moving inline script and css into external files, can improve download performance with minimal need for other changes in the page structure.
...stance between the user and your website.
...dynamically, a little research on this subject is beneficial.
...And 8 more matches

What’s in the head? Metadata in HTML - Learn web development
let you know what such things are, in case you come across them while browsing other websites' source code.
...f your site uses a content security policy (csp) to enhance its security, the policy applies to the favicon.
... the <link> element should always go inside the head of your document.
...And 8 more matches

Choosing the right approach - Learn web development
ynchronous to finish this module off, we'll provide a brief discussion of the different coding techniques and features we've discussed throughout, looking at which one you should use when, with recommendations and reminders of common pitfalls where appropriate.
...acks aren't.
... ?
...And 8 more matches

Third-party APIs - Learn web development
arge websites and services such as google maps, twitter, facebook, paypal, etc.
...er, facebook, paypal, etc.
...t basics (see first steps, building blocks, javascript objects), the basics of client-side apis objective: to learn how third-party apis work, and how to use them to enhance your websites.
...And 8 more matches

Ember interactivity: Events, classes and state - Learn web development
previous overview: client-side javascript frameworks next at this point we'll start adding some interactivity to our app, providing the ability to add and display new todo items.
... previous overview: client-side javascript frameworks next at this point we'll start adding some interactivity to our app, providing the ability to add and display new todo items.
...activity to our app, providing the ability to add and display new todo items.
...And 8 more matches

React interactivity: Events and state - Learn web development
previous overview: client-side javascript frameworks next with our component plan worked out, it's now time to start updating our app from a completely static ui to one that actually allows us to interact and change things.
...worked out, it's now time to start updating our app from a completely static ui to one that actually allows us to interact and change things.
...an successfully add and delete tasks, and toggle tasks as completed.
...And 8 more matches

Creating our first Vue component - Learn web development
previous overview: client-side javascript frameworks next now it's time to dive deeper into vue, and create our own custom component — we'll start by creating a component to represent each item in the todo list.
... such as calling components inside other components, passing data to them via props, and saving data state.
...: if you need to check your code against our version, you can find a finished version of the sample vue app code in our todo-vue repository.
...And 8 more matches

Displaying Places information using views
port the stylesheet browser/components/places/content/places.css and overlay the file browser/components/places/content/placesoverlay.xul: <?xml-stylesheet href="chrome://browser/content/places/places.css" ?> <?xul-overlay href="chrome://browser/content/places/placesoverlay.xul" ?> it's this stylesheet that binds elements with the special type attribute to one of the views.
...ext menu and commands, which you may want to take advantage of in your own uses of the views.
...rresponding property via javascript.
...And 8 more matches

Profiling with the Firefox Profiler
an click on timeline elements (the selected element gets darker when selected) and the tree view (see below) reflects the selected element.
...ice that the 'running time' decreases.
...this happens when a function has 2 or more non-trivial calls: the running time will be split between its children.
...And 8 more matches

Rhino Examples
examples have been provided that show how to control the javascript engine and how to implement scriptable host objects.
... examples have been provided that show how to control the javascript engine and how to implement scriptable host objects.
... examples have been provided that show how to control the javascript engine and how to implement scriptable host objects.
...And 8 more matches

SpiderMonkey 1.8.7
draft in progress - this is a draft, and right now it's mostly just a copy of the 1.8.5 release notes.
... draft in progress - this is a draft, and right now it's mostly just a copy of the 1.8.5 release notes.
... is the javascript engine that shipped in firefox 4.0.
...And 8 more matches

Components.utils
components.utils is a collection of various useful xpconnect features.
...created in specified compartment.
...spatch() dispatches a runnable to the current/main thread.
...And 8 more matches

XPIDL
le.
...4: basic interface attributes attribute interpretation uuid(12345678-fedc-ba98-7654-0123456789ab) this is the internal way this interface is accessed; it must be unique, and the uuid must be generated when creating the interface.
... way this interface is accessed; it must be unique, and the uuid must be generated when creating the interface.
...And 8 more matches

EventTarget.addEventListener() - Web APIs
); target.addeventlistener(type, listener [, usecapture, wantsuntrusted ]); // gecko/mozilla only parameters type a case-sensitive string representing the event type to listen for.
...ts that are bubbling upward through the tree will not trigger a listener designated to use capture.
... library like modernizr or detect it to do this test for you.
...And 8 more matches

WindowOrWorkerGlobalScope.setInterval() - Web APIs
onload="changecolor();"> <div id="my_box"> <p>hello world</p> </div> <button onclick="stoptextcolor();">stop</button> </body> </html> example 3: typewriter simulation the following example simulates typewriter by first clearing and then slowly typing content into the nodelist that matches a specified group of selectors.
...ass="intlink" onclick="otwexample1.terminate();">terminate</span>&nbsp;]</p> <div id="info"> vivamus blandit massa ut metus mattis in fringilla lectus imperdiet.
...orer versions 9 and below do not support the passing of arguments to the callback function in either settimeout() or setinterval().
...And 8 more matches

Accessibility documentation index - Accessibility
a11y—as in "a" then 11 characters then "y") in web development means enabling as many people as possible to use web sites, even when those people's abilities are limited in some way.
... related to a part of a document under review).
... of the elements that describe the object.
...And 8 more matches

Getting Started - Developer guides
this article guides you through the ajax basics and gives you some simple hands-on examples to get you started.
...asynchronous" nature, which means it can communicate with the server, exchange data, and update the page without having to refresh the page.
...t) { // ie 6 and older httprequest = new activexobject("microsoft.xmlhttp"); } note: for illustration purposes, the above is a somewhat simplified version of the code to be used for creating an xmlhttp instance.
...And 8 more matches

Proxy Auto-Configuration (PAC) file - HTTP
a proxy auto-configuration (pac) file is a javascript function that determines whether web browser requests (http, https, and ftp) go directly to the destination or are forwarded to a web proxy server.
... a proxy auto-configuration (pac) file is a javascript function that determines whether web browser requests (http, https, and ftp) go directly to the destination or are forwarded to a web proxy server.
...host the hostname extracted from the url.
...And 8 more matches

Exported WebAssembly functions - WebAssembly
exported webassembly functions are how webassembly functions are represented in javascript.
... exported webassembly functions are how webassembly functions are represented in javascript.
... exported webassembly functions are how webassembly functions are represented in javascript.
...And 8 more matches

Source code directories overview - Archive of obsolete content
core) functionality for the module.
...s code originated at uc berkeley.
...ying a single web page (e.g.
...And 7 more matches

The Joy of XUL - Archive of obsolete content
sults in their dhtml web applications but at the cost of complexity and performance and without any supporting standards.
...nfalls of most web applications is the tight coupling of user interface elements with client application logic.
...minating the original open source code with proprietary alterations.
...And 7 more matches

VBArray.toArray - Archive of obsolete content
non-standard.
... non-standard.
...t array converted from a vbarray.
...And 7 more matches

ECMAScript 5 support in Mozilla - Archive of obsolete content
ecmascript 5.1, an older version of the standard upon which javascript is based, was approved in june 2011.
... ecmascript 5.1, an older version of the standard upon which javascript is based, was approved in june 2011.
... ecmascript 5.1, an older version of the standard upon which javascript is based, was approved in june 2011.
...And 7 more matches

Using the Right Markup to Invoke Plugins - Archive of obsolete content
ape 7.
...e 7.1.
...like activex (and thus, not invoked via a unique identifier) but rather, mime type based.
...And 7 more matches

Introduction to game development for the Web - Game development
ith desktop and native os counterparts.
... truly think of the web as a better target platform for your game.
...for your game.
...And 7 more matches

Primitive - MDN Web Docs Glossary: Definitions of Web-related terms
in javascript, a primitive (primitive value, primitive data type) is data that is not an object and has no methods.
...ntation.
... array method mutates the array var foo = []; console.log(foo); // [] foo.push("plugh"); console.log(foo); // ["plugh"] // assignment gives the primitive a new (not a mutated) value bar = bar.touppercase(); // baz a primitive can be replaced, but it can't be directly altered.
...And 7 more matches

HTML: A good basis for accessibility - Learn web development
ity as you learn more about html — read more resources, look at more examples, etc.
...er (see bad-semantics.html), you'll not have a very good experience — the screen reader hasn't got anything to use as signposts, so you can't retrieve a useful table of contents, and the whole page is seen as a single giant block, so it is just read out in one go, all at once.
...y pressing the tab key; after a few presses, you should see the tab focus start to move through the different focusable elements.
...And 7 more matches

HTML: A good basis for accessibility - Learn web development
ity as you learn more about html — read more resources, look at more examples, etc.
...er (see bad-semantics.html), you'll not have a very good experience — the screen reader hasn't got anything to use as signposts, so you can't retrieve a useful table of contents, and the whole page is seen as a single giant block, so it is just read out in one go, all at once.
...y pressing the tab key; after a few presses, you should see the tab focus start to move through the different focusable elements.
...And 7 more matches

The web and web standards - Learn web development
y simple summary of what happened, but i did promise you a brief summary.
......
...cate with web servers (where web sites are stored).
...And 7 more matches

Script security
this page provides an overview of the script security architecture in gecko.
... policy, in which code gets full access to objects from its origin but highly restricted access to objects from a different origin.
... code gets full access to objects from its origin but highly restricted access to objects from a different origin.
...And 7 more matches

Rhino documentation
information on rhino for script writers and embedders.
...s what you must have to run rhino; what rhino cannot do.
...ve to run rhino; what rhino cannot do.
...And 7 more matches

SpiderMonkey compartments
a compartment is a new concept with spidermonkey 1.8.5.
... a compartment is a new concept with spidermonkey 1.8.5.
... a compartment is a new concept with spidermonkey 1.8.5.
...And 7 more matches

JS_InitClass
make a jsclass accessible to javascript code by creating its prototype, constructor, properties, and functions.
...on.
...object.
...And 7 more matches

Components.utils.forceGC
components.utils.forcegc lets scripts force a garbage collection cycle.
... components.utils.forcegc lets scripts force a garbage collection cycle.
... components.utils.forcegc lets scripts force a garbage collection cycle.
...And 7 more matches

Storage
rg.
...this section demonstrates how you can execute sql statements on your database.
...mplesql("create temp table table_name (column_name integer)"); similarly, the c++ looks like this: rv = mdbconn->executesimplesql(ns_literal_cstring("create temp table table_name (column_name integer)")); ns_ensure_success(rv, rv); results to be returned however, if you need to get results back, you should create the statement with the mozistorageconnection.createstatement() api like this in javascript: var statement = dbconn.createstatement("select * from table_name where column_name = :parameter"); this example uses a named placeholder called "parameter" to be bound later (described in binding parameters).
...And 7 more matches

XPCOM
xpcom is a cross platform component object model, similar to microsoft com.
...nd 1.9, for example).
...time a simple implementation of nsifactory is needed.
...And 7 more matches

Console messages - Firefox Developer Tools
riangle indicates that further information is available; clicking it displays or collapses that information.
...expect, copying the url into the clipboard open in network panel switches context to the network tab, selects the request and shows you the details resend request sends the network request again.
...witches context to the network tab, selects the request and shows you the details resend request sends the network request again.
...And 7 more matches

HTTP Index - HTTP
es the target of an http request is called a "resource", whose nature isn't defined further; it can be a document, a photo, or anything else.
...ted resources with the value of a validator.
...s a marker used by the server to advertise its support of partial requests.
...And 7 more matches

CSS Houdini
into the styling and layout process of a browser’s rendering engine.
...reating new css features without waiting for them to be implemented natively in browsers.
...posite processes — before applying any style updates found in scripts.
...And 7 more matches

Progressive loading - Progressive web apps (PWAs)
ad, the bigger the chance they will leave before waiting for everything to finish.
...of every version of the site: mobile, tablet, desktop, print only, etc.
...nd then manage other resources when needed.
...And 7 more matches

Setting Up a Development Environment - Archive of obsolete content
omator from waiting for your firefox session to finish.
... the add-ons listed.
...ted javascript objects.
...And 6 more matches

Index of archived content - Archive of obsolete content
elayed execution dialogs and prompts downloading files drag & drop embedding svg examples and demos from articles file i/o finding window handles forms related code snippets html in xul for rich tooltips html to dom isdefaultnamespace js xpcom javascript debugger service javascript timers javascript daemons management label and description lookupnamespaceuri lookupprefix miscellaneous modules on page load page loading post data to window preferences ...
... common pitfalls communication between html and your extension creating custom firefox extensions with the mozilla build system custom about: urls default preferences deploying a plugin as an extension developing add-ons displaying web content in an extension without security issues downloading json and javascript in extensions enhanced extension installation extension etiquette extension library extension packaging extension samples extension theming guidelines extension versioning, update and compatibility extensions support in seamonkey 2 firefox addons developer guide hiding browser chrome hotf...
... appendix d: loading scripts appendix e: dom building and insertion (html & xul) appendix f: monitoring dom changes connecting to remote content custom xul elements with xbl getting started with firefox extensions handling preferences intercepting page loads introduction javascript object management local storage mozilla documentation roadmap observer notifications setting up a development environment the box model the essentials of an extension useful mozilla community sites user notifications and alerts xpcom objects ...
...And 6 more matches

Mozilla Application Framework in Detail - Archive of obsolete content
lla's philosophy of using "the right tool for the right job" is manifested most prominently in the design of the user interface.
...ment the latest w3c standards and enables developers to build rich, dynamic web pages and web-based applications that look and run as intended across a variety of platforms and devices.
...l makes virtually all of the functionality of gecko available as a series of components, or reusable cross-platform libraries, that can be accessed from the browser or scripted from any mozilla application.
...And 6 more matches

Archived Mozilla and build documentation - Archive of obsolete content
e as a way of manipulating a set of dom nodes corresonding to a visual representation of calievent and calitodo objects.
...ch allows java code to interact with xpcom objects.
... the error console is a tool available in most mozilla-based applications that is used for reporting errors in the application chrome and in web pages user opens.
...And 6 more matches

Packages - Archive of obsolete content
obsolete since gecko 16.0 (firefox 16.0 / thunderbird 16.0 / seamonkey 2.13)this feature is obsolete.
...seamonkey 2.13)this feature is obsolete.
... classes from within javascript code.
...And 6 more matches

MSX Emulator (jsMSX) - Archive of obsolete content
what is it?
... what is it?
... what is it?
...And 6 more matches

Anatomy of a video game - Game development
this article looks at the anatomy and workflow of the average video game from a technical point of view, in terms of how the main loop should run.
...implemented in something called a main loop.
...lse entirely.
...And 6 more matches

Building up a basic demo with A-Frame - Game development
web browsers, but the community is still waiting for tools and libraries to appear, to make this easier.
...nd android), and oculus rift, gear vr and htc vive.
...hould start off by: making sure you are using a modern browser with good webgl support (and webxr support if you have available vr or ar hardware) such as the latest firefox or chrome — download firefox nightly or chrome (v54 or higher).
...And 6 more matches

asm.js - Game development
asm.js is a specification defining a subset of javascript that is highly optimizable.
... asm.js is a specification defining a subset of javascript that is highly optimizable.
...e of it, and further resources and examples.
...And 6 more matches

Looping code - Learn web development
previous overview: building blocks next programming languages are very useful for rapidly completing repetitive tasks, from multiple basic calculations to just about any other situation where you've got a lot of similar items of work to complete.
...ocks next programming languages are very useful for rapidly completing repetitive tasks, from multiple basic calculations to just about any other situation where you've got a lot of similar items of work to complete.
...tive tasks, from multiple basic calculations to just about any other situation where you've got a lot of similar items of work to complete.
...And 6 more matches

Making decisions in your code — conditionals - Learn web development
ramming language, the code needs to make decisions and carry out actions accordingly depending on different inputs.
...ent inputs.
...a weather app, if it is being looked at in the morning, show a sunrise graphic; show stars and a moon if it is nighttime.
...And 6 more matches

Video and Audio APIs - Learn web development
previous overview: client-side web apis next html5 comes with elements for embedding rich media in documents — <video> and <audio> — which in turn come with their own apis for controlling playback, seeking, etc.
... previous overview: client-side web apis next html5 comes with elements for embedding rich media in documents — <video> and <audio> — which in turn come with their own apis for controlling playback, seeking, etc.
...oes have advantages.
...And 6 more matches

Object building practice - Learn web development
previous overview: objects next in previous articles we looked at all the essential javascript object theory and syntax details, giving you a solid base to start from.
... previous overview: objects next in previous articles we looked at all the essential javascript object theory and syntax details, giving you a solid base to start from.
... in previous articles we looked at all the essential javascript object theory and syntax details, giving you a solid base to start from.
...And 6 more matches

Ember resources and troubleshooting - Learn web development
previous overview: client-side javascript frameworks next our final ember article provides you with a list of resources that you can use to go further in your learning, plus some useful troubleshooting and other information.
... previous overview: client-side javascript frameworks next our final ember article provides you with a list of resources that you can use to go further in your learning, plus some useful troubleshooting and other information.
... next our final ember article provides you with a list of resources that you can use to go further in your learning, plus some useful troubleshooting and other information.
...And 6 more matches

Introduction to automated testing - Learn web development
mes per day, can get tedious, and time-consuming.
...ately, there are tools to help us automate some of this pain away.
...: "index.js", "scripts": { "test": "test" }, "author": "chris mills", "license": "mit" } with this, you are ready to move on.
...And 6 more matches

Learn web development
le, which provides a practical introduction to web development.
...elopment.
...ction to html module and move on to our css first steps module.
...And 6 more matches

A bird's-eye view of the Mozilla framework
with the directory structure of the source tree.
...kit implementations provide a set of widgets for ui controls such as menus, command buttons, dialog boxes and scroll bars.
...plementation of the provider object in order to take advantage of its services.
...And 6 more matches

Emscripten
emscripten is an llvm to javascript compiler.
... emscripten is an llvm to javascript compiler.
...ten is an llvm to javascript compiler.
...And 6 more matches

Hacking Tips
this page list a few tips to help you investigate issues related to spidermonkey.
... file /home/nicolas/mozilla/contrib-push/js/src/jit/ion.cpp, line 3196.
...date self-hosted:20:403-500 note: the line 3196, listed above, corresponds to the location of the jit spew inside jit::invalidate function.
...And 6 more matches

Property attributes
ditionally defines several non-standard property attributes.
...a property.
...enumerate the property is visible to javascript for...in and for each ...
...And 6 more matches

SpiderMonkey 24
these release notes are an incomplete draft and were initially seeded from the spidermonkey 17 release notes, so they're not necessarily complete or fully accurate.
... incomplete draft and were initially seeded from the spidermonkey 17 release notes, so they're not necessarily complete or fully accurate.
...ance over previous spidermonkey releases, with a significantly improved garbage collector, a new jit compilation mode, and other features.
...And 6 more matches

Declaring and Using Callbacks
c functions occasionally take function pointers as arguments, which are generally used as callbacks.
... c functions occasionally take function pointers as arguments, which are generally used as callbacks.
...is no concurrency logic in js-ctypes, so invoking callbacks on other threads will cause things to crash.
...And 6 more matches

Web Audio API - Web APIs
familiar with music theory concepts, want to start building instruments, then you can go ahead and start building things with the advance tutorial and others as a guide (the above linked tutorial covers scheduling notes, creating bespoke oscillators and envelopes, as well as an lfo among other things.) if you aren't familiar with the programming basics, you might want to consult some beginner's javascript tutorials first and then come back here — see our beginner's javascript learning module for a great place to begin.
...nique person listening to the audio scene used in audio spatialization.
...node the pannernode interface represents the position and behavior of an audio source signal in 3d space, allowing you to create complex panning effects.
...And 6 more matches

MIME types (IANA media types) - HTTP
't be recognized as css by most browsers and will be ignored.
... and will be ignored.
...d with this type.
...And 6 more matches

Chapter 6: Firefox extensions and XUL applications - Archive of obsolete content
conference summer 2007.
...uthor of firefox 3 hacks (o'reilly japan, 2008.) this chapter discusses tools to assist in developing extensions.
... it's not well maintained fixme: we maybe should talk about firebug and chromebug fixme: and what about console 2 and docked-js console?
...And 5 more matches