JavaScript language resources - JavaScript
ecmascript is the scripting language that forms the basis of javascript.
... ecmascript standardized by the ecma international standards organization in the ecma-262 and ecma-402 specifications.
... the following ecmascript standards have been approved or are being worked on: name links release date description current editions ecma-262 10th edition pdf, html, working draft, repository 2019 ecmascript 2019 language specification ecma-262 9th edition pdf, html, working draft, repository 2018 ecmascript 2018 language specification ecma-402 5th edition working draft, repository 2018 ecmascript 2018 internationalization api specification obsolete/historical editions ecma-262 pdf june 1997 ecmascript: a general purpose, cross-platform programming language.
...And 13 more matches

JavaScript shells - JavaScript
a javascript shell allows you to quickly test snippets of javascript code without having to reload a web page.
... standalone javascript shells the following javascript shells are stand-alone environments, like perl or python.
... jsdb - a standalone javascript shell, with compiled binaries for windows, mac, and linux.
...And 13 more matches

<caption>: The Table Caption element - HTML: Hypertext Markup Language
the html <caption> element specifies the caption (or title) of a table.
... implicit aria role no corresponding role permitted aria roles no role permitted dom interface htmltablecaptionelement attributes this element includes the global attributes.
... align this enumerated attribute indicates how the caption must be aligned with respect to the table.
...And 12 more matches

<option>: The HTML Option element - HTML: Hypertext Markup Language
the html <option> element is used to define an item contained in a <select>, an <optgroup>, or a <datalist> element.
... as such, <option> can represent menu items in popups and other lists of items in an html document.
...the end tag is optional if this element is immediately followed by another <option> element or an <optgroup>, or if the parent element has no more content.
...And 12 more matches

JavaScript technologies overview - JavaScript
introduction whereas html defines a webpage's structure and content and css sets the formatting and appearance, javascript adds interactivity to a webpage and creates rich web applications.
... however, the umbrella term "javascript" as understood in a web browser context contains several very different elements.
... one of them is the core language (ecmascript), another is the collection of the web apis, including the dom (document object model).
...And 12 more matches

Object.getOwnPropertyDescriptor() - JavaScript
the object.getownpropertydescriptor() method returns an object describing the configuration of a specific property on a given object (that is, one directly present on an object and not in the object's prototype chain).
... syntax object.getownpropertydescriptor(obj, prop) parameters obj the object in which to look for the property.
... prop the name or symbol of the property whose description is to be retrieved.
...And 12 more matches

Intl.NumberFormat.prototype.resolvedOptions() - JavaScript
the intl.numberformat.prototype.resolvedoptions() method returns a new object with properties reflecting the locale and number formatting options computed during initialization of this numberformat object.
... syntax numberformat.resolvedoptions() return value a new object with properties reflecting the locale and number formatting options computed during the initialization of the given numberformat object.
... description the resulting object has the following properties: locale the bcp 47 language tag for the locale actually used.
...And 11 more matches

Object.getOwnPropertyDescriptors() - JavaScript
the object.getownpropertydescriptors() method returns all own property descriptors of a given object.
... syntax object.getownpropertydescriptors(obj) parameters obj the object for which to get all own property descriptors.
... return value an object containing all own property descriptors of an object.
...And 11 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.
... every time a web page does more than just sit there and display 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.
... get started prerequisites javascript is arguably more difficult to learn than related technologies such as html and css.
...And 10 more matches

About the JavaScript reference - JavaScript
the javascript reference serves as a repository of facts about the javascript language.
...as you write javascript code, you'll refer to these pages often (thus the title "javascript reference").
... if you're learning javascript, or need help understanding some of its capabilities or features, check out the javascript guide.
...And 10 more matches

nsCOMPtr versus RefPtr
gecko code uses both nscomptr and refptr as smart pointers.
... general rule of thumb for nscomptr versus refptr the general rule of thumb is to use nscomptr<t> when t is an interface type, and refptr<t> when t is a concrete type.
... this basic rule derives from the fact that some of the nscomptr<t> code is factored into the nscomptr_base base class, which stores the underlying mrawptr as an nsisupports*.
...And 9 more matches

Reflect.getOwnPropertyDescriptor() - JavaScript
the static reflect.getownpropertydescriptor() method is similar to object.getownpropertydescriptor().
... it returns a property descriptor of the given property if it exists on the object, undefined otherwise.
... syntax reflect.getownpropertydescriptor(target, propertykey) parameters target the target object in which to look for the property.
...And 8 more matches

handler.getOwnPropertyDescriptor() - JavaScript
the handler.getownpropertydescriptor() method is a trap for object.getownpropertydescriptor().
... syntax const p = new proxy(target, { getownpropertydescriptor: function(target, prop) { } }); parameters the following parameters are passed to the getownpropertydescriptor() method.
... prop the name of the property whose description should be retrieved.
...And 7 more matches

XRPermissionDescriptor.optionalFeatures - Web APIs
the xrpermissiondescriptor dictionary's optionalfeatures property is used to specify a list of webxr features which your app or site would like to use but can operate without if permission isn't granted to use them.
... syntax xrpermissiondescriptor = { mode: xrsessionmode, requiredfeatures: reqfeaturelist, optionalfeatures: optfeaturelist }; xrpermissiondescriptor.optionalfeatures = optfeaturelist; optfeaturelist = xrpermissiondescriptor.optionalfeatures; value an array of strings taken from the xrreferencespacetype enumerated type, indicating set of features that your app would like to use, but can operate without if permission to use them isn't available.
... reference space descriptors the types of reference space are listed in the table below, with brief information about their use cases and which interface is used to implement them.
...And 6 more matches

<figure>: The Figure with Optional Caption element - HTML: Hypertext Markup Language
the html <figure> (figure with optional caption) element represents self-contained content, potentially with an optional caption, which is specified using the (<figcaption>) element.
... the figure, its caption, and its contents are referenced as a single unit.
... permitted content a <figcaption> element, followed by flow content; or flow content followed by a <figcaption> element; or flow content.
...And 6 more matches

TypeError: Reduce of empty array with no initial value - JavaScript
the javascript exception "reduce of empty array with no initial value" occurs when a reduce function is used.
... message typeerror: reduce of empty array with no initial value error type typeerror what went wrong?
... in javascript, there are several reduce functions: array.prototype.reduce(), array.prototype.reduceright() and typedarray.prototype.reduce(), typedarray.prototype.reduceright()).
...And 6 more matches

Intl.Locale.prototype.script - JavaScript
the intl.locale.prototype.script property is an accessor property which returns the script used for writing the particular language used in the locale.
... description a script, sometimes called writing system, is one of the core attributes of a locale.
...for instance, the script associated with english is latin, whereas the script typically associated with korean is hangul.
...And 6 more matches

JavaScript typed arrays - JavaScript
javascript typed arrays are array-like objects that provide a mechanism for reading and writing raw binary data in memory buffers.
... as you may already know, array objects grow and shrink dynamically and can have any javascript value.
... javascript engines perform optimizations so that these arrays are fast.
...And 6 more matches

Actionscript Acceptance Tests - Archive of obsolete content
the majority of the acceptance tests are written in actionscript and located in test/acceptance.
... see running tamarin acceptance tests for instructions on running the acceptance test suite.
... the most common tests are written in actionscript and end with .as.
...And 5 more matches

Intl.DisplayNames.prototype.resolvedOptions() - JavaScript
the intl.displaynames.prototype.resolvedoptions() method returns a new object with properties reflecting the locale and style formatting options computed during the construction of the current displaynames object.
... syntax displaynames.resolvedoptions() return value an object with properties reflecting the locale and formatting options computed during the construction of the given displaynames object.
... description the object returned by resolvedoptions() has the following properties: locale the bcp 47 language tag for the locale actually used.
...And 5 more matches

Intl.PluralRules.prototype.resolvedOptions() - JavaScript
the intl.pluralrules.prototype.resolvedoptions() method returns a new object with properties reflecting the locale and plural formatting options computed during initialization of this pluralrules object.
... syntax pluralrule.resolvedoptions() return value a new object with properties reflecting the locale and plural formatting options computed during the initialization of the given pluralrules object.
... description the resulting object has the following properties: locale the bcp 47 language tag for the locale actually used.
...And 5 more matches

Intl.DateTimeFormat.prototype.resolvedOptions() - JavaScript
the intl.datetimeformat.prototype.resolvedoptions() method returns a new object with properties reflecting the locale and date and time formatting options computed during initialization of this datetimeformat object.
... syntax datetimeformat.resolvedoptions() return value a new object with properties reflecting the locale and date and time formatting options computed during the initialization of the given datetimeformat object.
... description the resulting object has the following properties: locale the bcp 47 language tag for the locale actually used.
...And 4 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.
... this preference controls whether javascript warnings are logged to the javascript console.
... example : <html> <head> <title>sample</title> </head> <body> <label id="name">enter you first name</label> <p id ="sample"></p> <script> "use strict" name1= "john" ; // this will cause and an error as variable not declared .
...And 3 more matches

Intl.Collator.prototype.resolvedOptions() - JavaScript
the intl.collator.prototype.resolvedoptions() method returns a new object with properties reflecting the locale and collation options computed during initialization of this collator object.
... syntax collator.resolvedoptions() return value a new object with properties reflecting the locale and collation options computed during the initialization of the given collator object.
... description the resulting object has the following properties: locale the bcp 47 language tag for the locale actually used.
...And 3 more matches

Intl​.List​Format​.prototype​.resolvedOptions() - JavaScript
the intl.listformat.prototype.resolvedoptions() method returns a new object with properties reflecting the locale and style formatting options computed during the construction of the current listformat object.
... syntax listformat.resolvedoptions() return value an object with properties reflecting the locale and formatting options computed during the construction of the given listformat object.
... description the object returned by resolvedoptions() has the following properties: locale the bcp 47 language tag for the locale actually used.
...And 3 more matches

empty - JavaScript
an empty statement is used to provide no statement, although the javascript syntax would expect one.
... syntax ; description the empty statement is a semicolon (;) indicating that no statement will be executed, even if javascript syntax requires one.
... the opposite behavior, where you want multiple statements, but javascript only allows a single one, is possible using a block statement, which combines several statements into a single one.
...And 3 more matches

MathML Demo: <mmultiscripts> - attach prescripts and tensor indices to a base
a mathml mmultiscripts object allows you to build tensor-like objects.
...the scripts come in pairs, with <mprescripts/> used to indicate prescripts and <none/> used to hold an empty position as in f b a .
... there are some variations possible: <mmultiscripts> a a b c d , nested <msubsup>s a a b c d , or &invisiblecomma; a a ⁣ c b ⁣ d .
...And 2 more matches

nsIAuthPromptAdapterFactory
netwerk/base/public/nsiauthpromptadapterfactory.idlscriptable an interface for wrapping nsiauthprompt interfaces to make them usable via an nsiauthprompt2 interface.
... 1.0 66 introduced gecko 1.9 inherits from: nsisupports last changed in gecko 1.9 (firefox 3) method overview nsiauthprompt2 createadapter(in nsiauthprompt aprompt); methods createadapter() wrap an object implementing nsiauthprompt so that it's usable via nsiauthprompt2.
... nsiauthprompt2 createadapter( in nsiauthprompt aprompt ); parameters aprompt the nsiauthprompt to wrap.
...And 2 more matches

PushSubscription.options - Web APIs
the options read-only property of the pushsubscription interface is an object containing containing the options used to create the subscription.
... syntax var options = pushsubscription.options value an read-only options object containing the following values: uservisibleonly: a boolean, indicating that the returned push subscription will only be used for messages whose effect is made visible to the user.
...this value is part of a signing key pair generated by your application server, and usable with elliptic curve digital signature (ecdsa), over the p-256 curve.
...And 2 more matches

<figcaption>: The Figure Caption element - HTML: Hypertext Markup Language
the html <figcaption> or figure caption element represents a caption or legend describing the rest of the contents of its parent <figure> element.
... permitted parents a <figure> element; the <figcaption> element must be its first or last child.
... examples please see the <figure> page for examples on <figcaption>.
...And 2 more matches

JavaScript error reference - JavaScript
below, you'll find a list of errors which are thrown by javascript.
... for a beginner's introductory tutorial on fixing javascript errors, see what went wrong?
... troubleshooting javascript.
...And 2 more matches

Intl.RelativeTimeFormat.prototype.resolvedOptions() - JavaScript
the intl.relativetimeformat.prototype.resolvedoptions() method returns a new object with properties reflecting the locale and relative time formatting options computed during initialization of this relativetimeformat object.
... syntax relativetimeformat.resolvedoptions() return value a new object with properties reflecting the locale and number formatting options computed during the initialization of the given relativetimeformat object.
... description the resulting object has the following properties: locale the bcp 47 language tag for the locale actually used.
...And 2 more matches

JavaScript reference - JavaScript
this part of the javascript section on mdn serves as a repository of facts about the javascript language.
... built-ins javascript standard built-in objects, along with their methods and properties.
...on intl intl.collator intl.datetimeformat intl.displaynames intl.listformat intl.locale intl.numberformat intl.pluralrules intl.relativetimeformat webassembly webassembly webassembly.module webassembly.instance webassembly.memory webassembly.table webassembly.compileerror webassembly.linkerror webassembly.runtimeerror statements javascript statements and declarations control flowblock break continue empty if...else switch throw try...catch declarations var let const functions and classes function function* async function return class iterations do...while for for each...in for...in for...of for await...of while other debugger import label with e...
...And 2 more matches

Trigger Scripts and Install Scripts - Archive of obsolete content
trigger scripts and install scripts trigger scripts are simple installations that can be initiated from event handlers and other javascript code on a web page.
... install scripts use the install, file, installversion and platform-specific installation object methods to initialize, queue, manage, and perform the installation of one or more software packages.
... these install scripts are typically located at the top level of the xpi archives in which the installations are stored.
... a trigger script may trigger the downloading of a xpi, which in turn will use its own install.js script to manage the complete installation.

BeforeInstallPromptEvent.prompt() - Web APIs
the prompt() method of the beforeinstallpromptevent interface allows a developer to show the install prompt at a time of their own choosing.
... syntax beforeinstallpromptevent.prompt() parameters none.
... returns an empty promise.
... example var istoosoon = true; window.addeventlistener("beforeinstallprompt", function(e) { if (istoosoon) { e.preventdefault(); // prevents prompt display // prompt later instead: settimeout(function() { istoosoon = false; e.prompt(); // throws if called more than once or default not prevented }, 10000); } // the event was re-dispatched in response to our request // ...

JavaScript Guide - JavaScript
the javascript guide shows you how to use javascript and gives an overview of the language.
... if you need exhaustive information about a language feature, have a look at the javascript reference.
... chapters this guide is divided into several chapters: introduction about this guide about javascript javascript and java ecmascript tools hello world grammar and types basic syntax & comments declarations variable scope variable hoisting data structures and types literals control flow and error handling if...else switch try/catch/throw error objects loops and iteration for while do...while break/continue for..in for..of functions defining functions calling functions function scope closures arguments & parameters arrow functions expressions and operators assignment & comparisons arithmetic operators bitwise & logical operators conditional (ternary) operator numbers and dates ...
...eating objects defining methods getter and setter details of the object model prototype-based oop creating object hierarchies inheritance promises guarantees chaining error propagation composition timing iterators and generators iterators iterables generators meta programming proxy handlers and traps revocable proxy reflect javascript modules exporting importing default exports renaming features aggregating modules dynamic module loading next » ...

Warning: JavaScript 1.6's for-each-in loops are deprecated - JavaScript
the javascript warning "javascript 1.6's for-each-in loops are deprecated; consider using es6 for-of instead" occurs when a for each (variable in obj) statement is used.
... message warning: javascript 1.6's for-each-in loops are deprecated; consider using es6 for-of instead error type warning what went wrong?
... javascript 1.6's for each (variable in obj) statement is deprecated, and will be removed in the near future.
... var array = [10, 20, 30]; for (var x of array) { console.log(x); // 10 // 20 // 30 } iterating over a null-able array for each...in does nothing if the specified value is null or undefined, but for...of will throw an exception in these cases.

Symbol.prototype.description - JavaScript
the read-only description property is a string returning the optional description of symbol objects.
... description symbol objects can be created with an optional description which can be used for debugging but not to access the symbol itself.
... the symbol.prototype.description property can be used to read that description.
... examples using description symbol('desc').tostring(); // "symbol(desc)" symbol('desc').description; // "desc" symbol('').description; // "" symbol().description; // undefined // well-known symbols symbol.iterator.tostring(); // "symbol(symbol.iterator)" symbol.iterator.description; // "symbol.iterator" // global symbols symbol.for('foo').tostring(); // "symbol(foo)" symbol.for('foo').description; // "foo" specifications specification ecmascript (ecma-262)the definition of 'get symbol.prototype.description' in that specification.

PushSubscription.subscriptionId - Web APIs
the endpoint read-only property of the pushsubscription interface returns a domstring containing the subscription id associated with the push subscription.
... syntax var subid = pushsubscription.subscriptionid; specifications specification status comment push api working draft initial definition browser compatibility the compatibility table on this page is generated from structured data.
... desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetsubscriptionidchrome full support 42edge full support ≤18firefox no support noie no support noopera full support 29safari no support nowebview android no support nochrome android ful...

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

Bytecode Descriptions
bigint operands: (uint32_t bigintindex) stack: ⇒ bigint push the bigint constant script->getbigint(bigintindex).
... string operands: (uint32_t atomindex) stack: ⇒ string push the string constant script->getatom(atomindex).
...jsop::typeof and jsop::typeofexpr are the same except that--amazingly--jsop::typeof affects the behavior of an immediately preceding jsop::getname or jsop::getgname instruction!
...And 136 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.
... we will now learn how to use typescript in svelte applications.
... first we'll learn what typescript is and what benefits it can bring us.
...And 125 more matches

JIT Optimization Strategies
note: this page is an in-progress documentation of jit optimization strategies planned to support the "jit coach" feature intended for inclusion in firefox developer tools.
...provide a repository of jit optimization strategy information which the jit coach tool can parse to display in its ui.
...provide a user-browsable documentation of optimization strategies, how they work, how they are defeated, and options for how to re-enable them.
...And 98 more matches

What is JavaScript? - Learn web development
overview: first steps next welcome to the mdn beginner's javascript course!
... in this article we will look at javascript from a high level, answering questions such as "what is it?" and "what can you do with it?", and making sure you are comfortable with javascript's purpose.
... objective: to gain familiarity with what javascript is, what it can do, and how it fits into a web site.
...And 82 more matches

Details of the object model - JavaScript
« previousnext » javascript is an object-based language based on prototypes, rather than being class-based.
... because of this different basis, it can be less apparent how javascript allows you to create hierarchies of objects and to have inheritance of properties and their values.
... this chapter attempts to clarify the situation.
...And 80 more matches

Content Scripts - Archive of obsolete content
instead, sdk add-ons need to factor the code that gets access to web content into separate scripts that are called content scripts.
... this page describes how to develop and implement content scripts.
... content scripts can be one of the more confusing aspects of working with the sdk, but you're very likely to have to use them.
...And 73 more matches

Handling common JavaScript problems - Learn web development
previous overview: cross browser testing next now we'll look at common cross-browser javascript problems and how to fix them.
... this includes information on using browser dev tools to track down and fix problems, using polyfills and libraries to work around problems, getting modern javascript features working in older browsers, and more.
... prerequisites: familiarity with the core html, css, and javascript languages; an idea of the high-level principles of cross browser testing.
...And 73 more matches

Mozilla Crypto FAQ - Archive of obsolete content
in this document i try to answer some frequently asked questions about the mozilla web browser and mail/news client and its support for ssl, s/mime, and related features based on cryptographic technology.
...if you wish to develop and distribute cryptographic software, particularly for commercial sale or distribution, then you should consult an attorney with expertise in the particular laws and regulations that apply in your jurisdiction.
... i've updated this version of the mozilla crypto faq to discuss the situation now that the rsa public key algorithm is in the public domain and a full open source crypto implementation is being added to the mozilla code base.
...And 65 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.
... regardless of how the back-ends of your web applications are implemented, client side you're using javascript for everything from same form validations to full ajax applications.
... now imagine being able to develop web apps using javascript server-side too.
...And 62 more matches

Debugger.Script - Firefox Developer Tools
debugger.script a debugger.script instance may refer to a sequence of bytecode in the debuggee or to a block of webassembly code.
... for the former, it is the debugger api’s presentation of a jsapi jsscript object.
... debugger.script for jsscripts for debugger.script instances referring to a jsscript, they are distinguished by their format property being "js".
...And 59 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.
... because there are such a diverse array of add-ons, and because the needs of developers have grown organically over time, the gecko runtime provides a number of means to dynamically load and execute javascript files.
...below is an overview of the more common means of loading scripts, along with some of their primary advantages, disadvantages, quirks, and use cases.
...And 54 more matches

nsIPromptService
embedding/components/windowwatcher/public/nsipromptservice.idlscriptable this interface can be used to display simple dialogs.
...for javascript, they are extra work, as you can't use an out parameter directly.
... you need to wrap them in a temporary object, which can be either empty or have a value property set to the out parameter type.
...And 53 more matches

Introduction - JavaScript
« previousnext » this chapter introduces javascript and discusses some of its fundamental concepts.
...if you are new to programming, try one of the tutorials linked on the main page about javascript.
... where to find javascript information the javascript documentation on mdn includes the following: learn web development provides information for beginners and introduces basic concepts of programming and the internet.
...And 53 more matches

Strict mode - JavaScript
javascript's strict mode, introduced in ecmascript 5, is a way to opt in to a restricted variant of javascript, thereby implicitly opting-out of "sloppy mode".
...strict mode code and non-strict mode code can coexist, so scripts can opt into strict mode incrementally.
... strict mode makes several changes to normal javascript semantics: eliminates some javascript silent errors by changing them to throw errors.
...And 50 more matches

Configuring Build Options
the default options are the most well-supported, so it is preferable to add as few options as possible.
...build options, including options not usable from the command-line, may appear in "confvars.sh" files in the source tree.
... using a mozconfig configuration file the choice of which mozilla application to build and other configuration options can be configured in a mozconfig file.
...And 49 more matches

JS::CompileOptions
this article covers features introduced in spidermonkey 17 compile options classes.
... constructor js::readonlycompileoptions(); // added in spidermonkey 31 js::owningcompileoptions(jscontext *cx); // added in spidermonkey 31 js::compileoptions(jscontext *cx, jsversion version = jsversion_unknown); name type description cx jscontext * pointer to a js context from which to derive runtime information.
... version jsversion javascript version used to compile the script.
...And 49 more matches

Introduction to Public-Key Cryptography - Archive of obsolete content
public-key cryptography and related standards and techniques underlie the security features of many products such as signed and encrypted email, single sign-on, and secure sockets layer (ssl) communications.
... this document introduces the basic concepts of public-key cryptography.
... for an overview of ssl, see "introduction to ssl." for an overview of encryption and decryption, see "encryption and decryption." information on digital signatures is available from "digital signatures." public-key cryptography is a set of well-established techniques and standards for protecting communications from eavesdropping, tampering, and impersonation attacks.
...And 48 more matches

Grammar and types - JavaScript
« previousnext » this chapter discusses javascript's basic grammar, variable declarations, data types and literals.
... basics javascript borrows most of its syntax from java, c, and c++, but it has also been influenced by awk, perl, and python.
... javascript is case-sensitive and uses the unicode character set.
...And 48 more matches

Scripting Java
this article shows how to use rhino to reach beyond javascript into java.
... scripting java has many uses.
... it allows us to write powerful scripts quickly by making use of the many java libraries available.
...And 47 more matches

Using the Screen Capture API - Web APIs
in this article, we will examine how to use the screen capture api and its getdisplaymedia() method to capture part or all of a screen for streaming, recording, or sharing during a webrtc conference session.
... note: it may be useful to note that recent versions of the webrtc adapter.js shim include implementations of getdisplaymedia() to enable screen sharing on browsers that support it but do not implement the current standard api.
... capturing screen contents capturing screen contents as a live mediastream is initiated by calling navigator.mediadevices.getdisplaymedia(), which returns a promise that resolves to a stream containing the live screen contents.
...And 44 more matches

Chapter 5: Let's build a Firefox extension - Archive of obsolete content
the chapters so far have each focused on technologies in isolation—xul, javascript, css, and xpcom.
... in this chapter, we’ll discuss how to put them together to actually build an extension.
...in the following you will find a brief description how to do so; a more detailed one can be found under setting up an extension development environment.
...And 42 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.
...this article helps you get started with javascript and furthers your understanding of what is possible.
... what is javascript?
...And 42 more matches

Introduction to the JavaScript shell
the javascript shell (js) is a command-line program included in the spidermonkey source distribution.
... it is the javascript equivalent of python's interactive prompt, the lisp read-eval-print loop, or ruby's irb.
... this article explains how to use the shell to experiment with javascript code and run javascript programs.
...And 42 more matches

JavaScript Daemons Management - Archive of obsolete content
in the javascript programming language, daemons are all processes created by javascript timers or by a worker instantiation.
... advantages of this approch: abstraction passage of this object to javascript timers (both setinterval and settimeout) optimisation (avoiding closures) modularity the code the code of this framework is split into three files: daemon.js (the core) daemon-safe.js (an extension of the core which adds a replacement of setinterval with a recursive invocation of settimeout) daemon-methods.js (a wide and highly scalable collection of methods) the only independent modu...
...2 |*| |*| daemon.js - a javascript highly scalable daemons manager.
...And 40 more matches

NSS Sample Code Sample_3_Basic Encryption and MACing
nss sample code 3: basic encryption and macing this example program demonstrates how to encrypt and mac a file.
... sample code 3 /* nspr headers */ #include <prthread.h> #include <plgetopt.h> #include <prerror.h> #include <prinit.h> #include <prlog.h> #include <prtypes.h> #include <plstr.h> /* nss headers */ #include <keyhi.h> #include <pk11priv.h> /* our samples utilities */ #include "util.h" #define buffersize 80 #define digestsize 16 #define ptext_mac_buffer_size 96 #define ciphersize 96 #define blocksize 32 #define cipher_header "-----begin cipher-----" #define cipher_trailer "-----end cipher-----" #define enckey_header "-----begin aeskey ckaid-----" #define enckey_trailer "-----end aeskey ckaid-----" #define mackey_header "-----begin mackey ckaid-----" #define mackey_trailer "-----end mackey ckaid-----"...
... #define iv_header "-----begin iv-----" #define iv_trailer "-----end iv-----" #define mac_header "-----begin mac-----" #define mac_trailer "-----end mac-----" #define pad_header "-----begin pad-----" #define pad_trailer "-----end pad-----" typedef enum { encrypt, decrypt, unknown } commandtype; typedef enum { symkey = 0, mackey = 1, iv = 2, mac = 3, pad = 4 } headertype; /* print a usage message and exit */ static void usage(const char *progname) { fprintf(stderr, "\nusage: %s -c <a|b> -d <dbdirpath> [-z <noisefilename>] " "[-p <dbpwd> | -f <dbpwdfile>] -i <ipfilename> -o <opfilename>\n\n", progname); fprintf(stderr, "%-20s specify 'a' for encrypt operat...
...And 40 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.
... this chapter provides an overview of these statements.
... the javascript reference contains exhaustive details about the statements in this chapter.
...And 39 more matches

JavaScript
javascript (js) is a lightweight, interpreted, or just-in-time compiled programming language with first-class functions.
... while it is most well-known as the scripting language for web pages, many non-browser environments also use it, such as node.js, apache couchdb and adobe acrobat.
... javascript is a prototype-based, multi-paradigm, single-threaded, dynamic language, supporting object-oriented, imperative, and declarative (e.g.
...And 37 more matches

WebAssembly Concepts - WebAssembly
this article explains the concepts behind how webassembly works including its goals, the problems it solves, and how it runs inside the web browser's rendering engine.
...webassembly modules can be imported into a web (or node.js) app, exposing webassembly functions for use via javascript.
... javascript frameworks could make use of webassembly to confer massive performance advantages and new features while still making functionality easily available to web developers.
...And 37 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).
... when it comes to inheritance, javascript only has one construct: objects.
... nearly all objects in javascript are instances of object which sits on the top of a prototype chain.
...And 35 more matches

Interacting with page scripts - Archive of obsolete content
by default, content scripts loaded by add-ons and scripts loaded by web pages are insulated from each other: content scripts can't interact directly with page scripts or access javascript objects they create page scripts can't interact directly with content scripts or access objects they create.
...you don't want arbitrary web pages to be able to access objects in content scripts, and you don't want objects created by content scripts to clash with objects created by page scripts.
...this guide describes: how to share objects between content scripts and page scripts how to send messages between content scripts and page scripts sharing objects with page scripts there are two possible cases here: a content script might want to access an object defined by a page script a content script might want to expose an object to a page script access objects defined by page scripts to access page script objects from content scripts, you can use the global unsafewindow object.
...And 34 more matches

Command line options
command line options are used to specify various startup options for mozilla applications.
... for example, if you have multiple profiles you can use command line configuration options to bypass the profile manager and open a specific profile.
...this page describes the commonly used options and how to use them.
...And 34 more matches

Chapter 3: Introduction to XUL—How to build a more intuitive UI - Archive of obsolete content
there are earlier experiments going back a long way in developing user interfaces using a combination of html and scripting languages, and xul could be considered an evolutionary step from that.
...xul, on the other hand, was conceived from the ground up as a markup language for user interfaces, and makes it possible to insert ui components with sophisticated features just by writing tags, without any particular scripting.
... for each element that i explain in this chapter, i will illustrate it with a source code example.
...And 32 more matches

SubtleCrypto.wrapKey() - Web APIs
the wrapkey() method of the subtlecrypto interface "wraps" a key.
... this means that it exports the key in an external, portable format, then encrypts the exported key.
... as with subtlecrypto.exportkey(), you specify an export format for the key.
...And 32 more matches

Lexical grammar - JavaScript
this page describes javascript's lexical grammar.
... the source text of ecmascript scripts gets scanned from left to right and is converted into a sequence of input elements which are tokens, control characters, line terminators, comments or white space.
... ecmascript also defines certain keywords and literals and has rules for automatic insertion of semicolons to end statements.
...And 32 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.
... prerequisites: basic computer literacy, a basic understanding of html and css, an understanding of what javascript is.
... objective: to have a first bit of experience at writing some javascript, and gain at least a basic understanding of what writing a javascript program involves.
...And 31 more matches

RTCPeerConnection.setRemoteDescription() - Web APIs
the rtcpeerconnection method setremotedescription() sets the specified session description as the remote peer's current offer or answer.
... the description specifies the properties of the remote end of the connection, including the media format.
... the method takes a single parameter—the session description—and it returns a promise which is fulfilled once the description has been changed, asynchronously.
...And 31 more matches

SubtleCrypto - Web APIs
the subtlecrypto interface of the web crypto api provides a number of low-level cryptographic functions.
... access to the features of subtlecrypto is obtained through the subtle property of the crypto object you get from window.crypto.
... warning: this api provides a number of low-level cryptographic primitives.
...And 31 more matches

Avoiding leaks in JavaScript XPCOM components
take every information on this site with a grain of salt, although most concepts and best practices still apply.
... using xpcom in javascript (also known as xpconnect) is an environment where memory management issues are not obvious.
...despite this, it's easy to write javascript code that leaks.
...And 30 more matches

CSP: script-src - HTTP
the http content-security-policy (csp) script-src directive specifies valid sources for javascript.
... this includes not only urls loaded directly into <script> elements, but also things like inline script event handlers (onclick) and xslt stylesheets which can trigger script execution.
... syntax one or more sources can be allowed for the script-src policy: content-security-policy: script-src <source>; content-security-policy: script-src <source> <source>; sources <source> can be one of the following: <host-source> internet hosts by name or ip address, as well as an optional url scheme and/or port number.
...And 30 more matches

Frame script loading and lifetime
loading frame scripts to load a frame script use the loadframescript() function.
... this line of code loads a frame script into the currently selected tab.
... the script just writes "foo" to the command line: // chrome script var mm = gbrowser.selectedbrowser.messagemanager; mm.loadframescript('data:,dump("foo\\n")', true); loadframescript() takes two mandatory parameters: a url that points to the frame script you want to load a boolean flag, allowdelayedload note: if the message manager is a global frame message manager or a window message manager, loadframescript() may load the script multiple times, once in each applicable frame.
...And 29 more matches

Places utilities for JavaScript
description_anno - this annotation stores description information about a bookmark.
...g atype, nsiuri aoverrideuri); array unwrapnodes(string blob, string atype); nsitransaction maketransaction(string data, string type, nsinavhistoryresultnode container, int index, boolean copy); nsinavhistoryresult getfoldercontents(int afolderid, boolean aexcludeitems, boolean aexpandqueries); boolean showaddbookmarkui(nsiuri auri, string atitle, string adescription, int adefaultinsertionpoint, boolean ashowpicker, boolean aloadinsidebar, string akeyword, string apostdata); boolean showminimaladdbookmarkui(nsiuri auri, string atitle, string adescription, int adefaultinsertionpoint, boolean ashowpicker, boolean aloadinsidebar, string akeyword, string apostdata); boolean showaddlivemarkui(nsiuri afeeduri, nsiuri asiteuri, string atitle, st...
...ring adescription, int adefaultinsertionpoint, boolean ashowpicker); boolean showminimaladdlivemarkui(nsiuri afeeduri, nsiuri asiteuri, string atitle, string adescription, int adefaultinsertionpoint, boolean ashowpicker); boolean showminimaladdmultibookmarkui(array nsiuri aurilist); boolean showbookmarkproperties(int aid); boolean showfolderproperties(int aid); boolean showaddfolderui(string atitle, int adefaultinsertionpoint, boolean ashowpicker); array object getannotationsforuri(nsiuri auri); array object getannotationsforitem(int aitemid); void setannotationsforuri(nsiuri auri, object aannos); void setannotationsforuri(int aitemid, object aannos); getviewfornode(nsidomnode anode); void mark...
...And 28 more matches

Communicating With Other Scripts - Archive of obsolete content
this page is now obsolete, and its content has been incorporated into the main page on content scripts.
... this section of the guide explains how content scripts can communicate with: your main.js file, or any other modules in your add-on other content scripts loaded by your add-on page scripts (that is, scripts embedded in the web page or included using <script> tags) main.js your content scripts can communicate with your add-on's "main.js" (or any other modules you're written for your add-on) by sending it messages, using either the port.emit() api or the postmessage() api.
... content scripts content scripts loaded into the same document at the same time using the same method can interact with each other directly as well as with the web content itself.
...And 27 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.
... operators javascript has the following types of operators.
... assignment operators comparison operators arithmetic operators bitwise operators logical operators string operators conditional (ternary) operator comma operator unary operators relational operators javascript has both binary and unary operators, and one special ternary operator, the conditional operator.
...And 27 more matches

SubtleCrypto.unwrapKey() - Web APIs
the unwrapkey() method of the subtlecrypto interface "unwraps" a key.
... this means that it takes as its input a key that has been exported and then encrypted (also called "wrapped").
... it decrypts the key and then imports it, returning a cryptokey object that can be used in the web crypto api.
...And 26 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.
... note: if you are unfamiliar with the basic concepts mentioned in this article and need more explanation, read webassembly concepts first, then come back.
... some simple examples let’s run through some examples that explain how to use the webassembly javascript api, and how to use it to load a wasm module in a web page.
...And 26 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 ...
...this article outlines some css and javascript best practices that should be considered to ensure even complex content is as accessible as possible.
... prerequisites: basic computer literacy, a basic understanding of html, css, and javascript, and understanding of what accessibility is.
...And 25 more matches

Obsolete: XPCOM-based scripting for NPAPI plugins - Archive of obsolete content
it does not cover netscape 6 and 6.01 introduction plugins that used to take advantage of being scriptable via liveconnect in 4.x netscape browsers lost this possibility in the new world.
...the new mozilla xpcom architecture allows xpcom components be scriptable via a different mechanism called xpconnect.
... we leverage some of these ideas to help you make your netscape communicator 4.x plugins exposed to javascript in mozilla based browsers.
...And 24 more matches

nsIScriptError
js/xpconnect/idl/nsiscripterror.idlscriptable represents javascript errors and warnings for use by the console service.
... 66 introduced gecko 1.0 inherits from: nsiconsolemessage last changed in gecko 1.9 (firefox 3) implemented by: @mozilla.org/scripterror;1.
... to create an instance, use: var scripterror = components.classes["@mozilla.org/scripterror;1"] .createinstance(components.interfaces.nsiscripterror); note: the nsiscripterror2 interface was merged into this interface in gecko 12.0.
...And 24 more matches

HTMLScriptElement - Web APIs
html <script> elements expose the htmlscriptelement interface, which provides special properties and methods for manipulating the behavior and execution of <script> elements (beyond the inherited htmlelement interface).
... javascript files should be served with the application/javascript mime type, but browsers are lenient and block them only if the script is served with an image type (image/*), video type (video/*), audio type (audio/*), or text/csv.
... if the script is blocked, its element receives an error event; otherwise, it receives a load event.
...And 24 more matches

RTCPeerConnection.setLocalDescription() - Web APIs
the rtcpeerconnection method setlocaldescription() changes the local description associated with the connection.
... this description specifies the properties of the local end of the connection, including the media format.
... the method takes a single parameter—the session description—and it returns a promise which is fulfilled once the description has been changed, asynchronously.
...And 24 more matches

try...catch - JavaScript
the try...catch statement marks a block of statements to try and specifies a response should an exception be thrown.
... syntax try { try_statements } [catch (exception_var_1 if condition_1) { // non-standard catch_statements_1 }] ...
... [catch (exception_var_2) { catch_statements_2 }] [finally { finally_statements }] try_statements the statements to be executed.
...And 24 more matches

JS_SetOptions
enables and disables options on a jscontext, replacing all previously set options.
... syntax uint32 js_setoptions(jscontext *cx, uint32 options); name type description cx jscontext * a context on which to set options.
... options uint32 the new set of options.
...And 23 more matches

Regular expressions - JavaScript
in javascript, regular expressions are also objects.
...this chapter describes javascript regular expressions.
... creating a regular expression you construct a regular expression in one of two ways: using a regular expression literal, which consists of a pattern enclosed between slashes, as follows: let re = /ab+c/; regular expression literals provide compilation of the regular expression when the script is loaded.
...And 23 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.
... prerequisites: basic computer literacy, a basic understanding of html and css, an understanding of what javascript is.
... objective: to gain familiarity with the basics of math in javascript.
...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.
... running code after a return statement remember also that when you return from a function, the javascript interpreter exits the function — no code after the return statement will run.
... object notation versus normal assignment when you assign something normally in javascript, you use a single equals sign, e.g.: const mynumber = 0; with objects, however, you need to take care to use the correct syntax.
...And 22 more matches

mozIJSSubScriptLoader
js/xpconnect/idl/mozijssubscriptloader.idlscriptable this interface can be used from privileged javascript to load and run javascript code from the given url at runtime.
... 66 introduced gecko 1.0 inherits from: nsisupports last changed in gecko 28 (firefox 28 / thunderbird 28 / seamonkey 2.25 / firefox os 1.3) implemented by: @mozilla.org/moz/jssubscript-loader;1.
... to get this service, use: var mozijssubscriptloader = components.classes["@mozilla.org/moz/jssubscript-loader;1"] .getservice(components.interfaces.mozijssubscriptloader); note: see components.utils.import for another way to import javascript code.
...And 22 more matches

CSP: script-src-attr - HTTP
the http content-security-policy (csp) script-src-attr directive specifies valid sources for javascript inline event handlers.
... this includes only inline script event handlers like onclick, but not urls loaded directly into <script> elements.
...if this directive is absent, the user agent will look for the script-src directive, and if both of them are absent, fallback to default-src directive.
...And 22 more matches

Working with objects - JavaScript
« previousnext » javascript is designed on a simple object-based paradigm.
...this chapter describes how to use objects, properties, functions, and methods, and how to create your own objects.
... objects overview objects in javascript, just as in many other programming languages, can be compared to objects in real life.
...And 22 more matches

Use JavaScript within a webpage - Learn web development
take your webpages to the next level by harnessing javascript.
... learn in this article how to trigger javascript right from your html documents.
... objective: learn how to trigger javascript in your html file, and learn the most important best practices for keeping javascript accessible.
...And 21 more matches

JIT Optimization Outcomes
spidermonkey's optimizing jit, ionmonkey, uses different optimization strategies to speed up various operations.
... this page documents the meaning of different optimization outcomes.
... general outcomes general outcomes shared between various optimization strategies.
...And 21 more matches

SubtleCrypto.importKey() - Web APIs
the importkey() method of the subtlecrypto interface imports a key: that is, it takes as input a key in an external, portable format and gives you a cryptokey object that you can use in the web crypto api.
... the function accepts several import formats: see supported formats for details.
... syntax const result = crypto.subtle.importkey( format, keydata, algorithm, extractable, usages ); parameters format is a string describing the data format of the key to import.
...And 21 more matches

CSP: script-src-elem - HTTP
the http content-security-policy (csp) script-src-elem directive specifies valid sources for javascript <script> elements, but not inline script event handlers like onclick.
...if this directive is absent, the user agent will look for the script-src directive, and if both of them are absent, fallback to default-src directive.
... syntax one or more sources can be allowed for the script-src-elem policy: content-security-policy: script-src-elem <source>; content-security-policy: script-src-elem <source> <source>; script-src-elem can be used in conjunction with script-src: content-security-policy: script-src <source>; content-security-policy: script-src-elem <source>; sources <source> can be one of the following: <host-source> internet hosts by name or ip address, as well as an optional url scheme and/or port number.
...And 21 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.
... ecmascript versions language resources learn more about the ecmascript standards on which the javascript language is based on.
... ecmascript 5 support implementation status for the current standard ecma-262 edition 5.1 in mozilla-based engines and products.
...And 20 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.
... this is a "hello world" tutorial for creating an xpcom component in javascript.
...if you want to use your component only from javascript, you can skip to the next section.
...And 20 more matches

Object.defineProperty() - JavaScript
syntax object.defineproperty(obj, prop, descriptor) parameters obj the object on which to define the property.
... descriptor the descriptor for the property being defined or modified.
... description this method allows a precise addition to or modification of a property on an object.
...And 20 more matches

Properly Using CSS and JavaScript in XHTML Documents - Archive of obsolete content
in particular: raw < and & characters are not allowed except inside of cdata sections (<![cdata[ ...
... problems with inline style and script inline style and script tags can cause several different problems in xhtml when it is treated as xml rather than html.
... javascript contains characters which can not exist in xhtml javascript typically contains characters which can not exist in xhtml outside of cdata sections.
...And 19 more matches

Inheritance in JavaScript - Learn web development
in addition, we present some advice on when and where you might use oojs, and look at how classes are dealt with in modern ecmascript syntax.
... prerequisites: basic computer literacy, a basic understanding of html and css, familiarity with javascript basics (see first steps and building blocks) and oojs basics (see introduction to objects).
... objective: to understand how it is possible to implement inheritance in javascript.
...And 19 more matches

nsIPushSubscription
dom/interfaces/push/nsipushservice.idlscriptable includes information needed to send a push message to privileged code.
... inherits from: nsisupports last changed in gecko 46.0 (firefox 46.0 / thunderbird 46.0 / seamonkey 2.43) each subscription is associated with a unique url generated by the push service.
... sending a post request to this url routes the message to the instance of firefox that created the subscription.
...And 19 more matches

Writing JavaScript for XHTML - Archive of obsolete content
(rather than displaying content, it would present the user with a file download dialog.) but it is also founded in the experience that javascript, authored carefully for html, can break when placed with an xml environment.
...it will encourage web authors to use more xml features and make their javascript interoperable with real xhtml applications.
... problem: nothing works after switching the mime type suddenly no inline script works anymore.
...And 18 more matches

Optimizing Applications For NSPR
the only exception to this rule is the <tt>select()</tt> and <tt>poll()</tt> system calls on unix, both of which nspr has overridden to make sure they are aware of the nspr local threads.
... in the combined (mxn) model, which includes nt, irix (sprocs), and pthreads-user, the primordial thread is always a local thread.
... nspr uses timer signals to implement thread preemption for local threads on some platforms.
...And 18 more matches

Creating JavaScript jstest reftests
this directory contains tests of spidermonkey conformance to ecmascript as well as spidermonkey non-standard extenstions to ecmascript.
... non262 tests the directory js/src/tests/non262/ should contain all tests of the following type: regressions of spidermonkey non-standard spidermonkey extensions to the javascript language test of "implementation-defined" details of the ecmascript standard for example, the exact definition of pi or some details of array sorting.
... performance tests or stress tests tests of spidermonkey's comformance to the ecmascript standard a brief history: in 2017, spidermonkey started comsuming test262, a comprehensive tests suite for ecmascript implementations.
...And 18 more matches

JS_CompileScriptForPrincipals
compile a security-enabled script for execution.
... syntax jsscript * js_compilescriptforprincipals(jscontext *cx, jsobject *obj, jsprincipals *principals, const char *src, size_t length, const char *filename, unsigned int lineno); jsscript * js_compileucscriptforprincipals(jscontext *cx, jsobject *obj, jsprincipals *principals, const jschar *src, size_t length, const char *filename, unsigned int lineno); jsobject * js_compilescriptforprincipalsversion(jscontext *cx, jsobject *obj, jsprincipals *principals, const char *src, size_t length, const char *filename, unsigned int lineno, jsversion version); // obsoleted since jsapi 19 jsobject * js_compileucscriptforprincipalsversion(jscontext *cx, jsobject *obj, jsprincipals *principals, const jschar *src, size_t length, const char *filename, unsigned int line...
...no, jsversion version); // obsoleted since jsapi 19 name type description cx jscontext * the context in which to compile the script.
...And 18 more matches

nsIAuthPrompt2
netwerk/base/public/nsiauthprompt2.idlscriptable an interface allowing to prompt for a username and password.
...it can be used to prompt users for authentication information, either synchronously or asynchronously.
... this interface is implemented by @mozilla.org/login-manager/prompter;1.
...And 18 more matches

nsIFrameScriptLoader
idl file: mozilla-central/source/dom/base/nsimessagemanager.idl inherits from: nsisupports this interface is used to load frame scripts.
... methods void loadframescript(in astring aurl, in boolean aallowdelayedload, [optional] in boolean aruninglobalscope) void removedelayedframescript(in astring aurl); jsval getdelayedframescripts(); loadframescript() load a script in the remote frame.
... frame scripts are loaded as soon as loadframescript() is called.
...And 18 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.
...this lets the given function run without the risk of interfering with another script's execution, yet also ensures that the microtask runs before the user agent has the opportunity to react to actions taken by the microtask.
... javascript promises and the mutation observer api both use the microtask queue to run their callbacks, but there are other times when the ability to defer work until the current event loop pass is wrapping up.
...And 18 more matches

Adding captions and subtitles to HTML5 video - Developer guides
this article will take the same player and show how to add captions and subtitles to it, using the webvtt format and the <track> element.
... captioned video example in this article, we will refer to the video player with captions example.
... this example uses an excerpt from the sintel open movie, created by the blender foundation.
...And 18 more matches

Indexed collections - JavaScript
« previousnext » this chapter introduces collections of data which are ordered by an index value.
... javascript does not have an explicit array data type.
...alternatively, create an empty array first before adding the single element to it.
...And 18 more matches

eval() - JavaScript
warning: executing javascript from a string is an enormous security risk.
... the eval() function evaluates javascript code represented as a string.
... syntax eval(string) parameters string a string representing a javascript expression, statement, or sequence of statements.
...And 18 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.
... the first step to good javascript object management is having a namespace, or a javascript object that contains our code and data, that you know will not conflict with firefox code or other extensions.
...it's one of the funky properties of javascript: all objects are nothing more than name / value mappings.
...And 17 more matches

Drag and Drop JavaScript Wrapper - Archive of obsolete content
this section describes how to use the javascript wrapper for drag and drop.
... the javascript drag and drop wrapper the javascript wrapper to drag and drop simplifies the process by handling all of the xpcom interfaces for you.
...you can include this file in your xul file with the script tag in the same way you would include your own scripts.
...And 17 more matches

Learn XPI Installer Scripting by Example - Archive of obsolete content
this article uses the installer script from browser.xpi install package as the basis for discussing xpi installations in general.
... this installer script is relatively short, but it exercises most of the important features of the xpinstall api, and it can easily be used as a template for other more general software installations.
...a xpi is a pkzip-compressed archive (like zip and jar files) with a special script at the highest level that manages the installation.
...And 17 more matches

nsIScriptableIO
file and stream guide: [ nsiscriptableio | accessing files | getting file information | reading from files | writing to files | moving, copying and deleting files | uploading and downloading files | working with directories ] important note: the pages from the file and stream guide use the io object (nsiscriptableio), which was not available in any released version of the platform (pending some fixes).
...other documentation on files and i/o not using the unavailable nsiscriptableio apis: code snippets: file i/o, open and save dialogs, reading textual data, writing textual data, list of file-related error codes.
... nsiscriptableio provides a convenient api for creating files and streams, as well as for reading and writing data to them.
...And 17 more matches

xptcall FAQ
what is xptcall?
... xptcall is a small low level xpcom method call library.
... why does xptcall exist?
...And 17 more matches

HTMLOptionElement - Web APIs
the htmloptionelement interface represents <option> elements and inherits all classes and methods of the htmlelement interface.
...co,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">htmlelement</text></a><polyline points="491,25 501,20 501,30 491,25" stroke="#d4dde4" fill="none"/><line x1="501" y1="25" x2="509" y2="25" stroke="#d4dde4"/><line x1="509" y1="25" x2="509" y2="90" stroke="#d4dde4"/><line x1="509" y1="90" x2="492" y2="90" stroke="#d4dde4"/><a xlink:href="/docs/web/api/htmloptionelement" target="_top"><rect x="321" y="65" width="170" height="50" fill="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="406" y="94" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">htmloptionelement</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties inheri...
... htmloptionelement.defaultselected is a boolean that contains the initial value of the selected html attribute, indicating whether the option is selected by default or not.
...And 17 more matches

Screen Capture API - Web APIs
the screen capture api introduces additions to the existing media capture and streams api to let the user select a screen or portion of a screen (such as a window) to capture as a media stream.
... screen capture api concepts and usage the screen capture api is relatively simple to use.
... its sole method is mediadevices.getdisplaymedia(), whose job is to ask the user to select a screen or portion of a screen to capture in the form of a mediastream.
...And 17 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.
... prerequisites: basic computer literacy, a basic understanding of html and css, familiarity with javascript basics (see first steps and building blocks).
... objective: to understand the basic theory behind object-oriented programming, how this relates to javascript ("most things are objects"), and how to start working with javascript objects.
...And 16 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.
... this article looks to introduce performance issues caused by scripts and introduces tips and tricks for optimizing javascript for web performance.
... objective: to learn about the effects of javascript on performance optimization, and how a javascript file size is not the only impact on web performance.
...And 16 more matches

Process scripts
process scripts are new in firefox 38.
... when you need to run code in the content process in order to access web content, then you should use frame scripts.
... however, a problem with frame scripts is that they can be loaded multiple times in the content process, in multiple scopes that are insulated from each other.
...And 16 more matches

PRSockOption
enumeration type used in the option field of prsocketoptiondata to form the name portion of a name-value pair.
... syntax #include <prio.h> typedef enum prsockoption { pr_sockopt_nonblocking, pr_sockopt_linger, pr_sockopt_reuseaddr, pr_sockopt_keepalive, pr_sockopt_recvbuffersize, pr_sockopt_sendbuffersize, pr_sockopt_iptimetolive, pr_sockopt_iptypeofservice, pr_sockopt_addmember, pr_sockopt_dropmember, pr_sockopt_mcastinterface, pr_sockopt_mcasttimetolive, pr_sockopt_mcastloopback, pr_sockopt_nodelay, pr_sockopt_maxsegment, pr_sockopt_last } prsockoption; enumerators the enumeration has the following enumerators: pr_sockopt_nonblocking nonblocking i/o.
... pr_sockopt_linger time to linger on close if data is present in the socket send buffer.
...And 16 more matches

JS_EvaluateScriptForPrincipals
compile and execute a security-enabled script.
... syntax jsbool js_evaluatescriptforprincipals(jscontext *cx, jsobject *obj, jsprincipals *principals, const char *src, unsigned int length, const char *filename, unsigned int lineno, jsval *rval); jsbool js_evaluatescriptucforprincipals(jscontext *cx, jsobject *obj, jsprincipals *principals, const jschar *src, unsigned int length, const char *filename, unsigned int lineno, jsval *rval); jsbool js_evaluatescriptforprincipalsversion(jscontext *cx, jsobject *obj, jsprincipals *principals, const char *bytes, unsigned int length, const char *filename, unsigned int lineno, jsval *rval, jsversion version); jsbool js_evaluateucscriptforprincipalsversion(jscontext *cx, jsobject *obj, jsprincipals *principals, const jschar *chars, unsigned int length, const char *...
...filename, unsigned int lineno, jsval *rval, jsversion version); name type description cx jscontext * the context in which to run the script.
...And 16 more matches

nsIProcessScriptLoader
idl file: mozilla-central/source/dom/base/nsimessagemanager.idl inherits from: nsisupports this interface is used by parent process message managers to load scripts into a child process.
... the scripts run only once per process.
... the global object for process scripts is a contentprocessmessagemanager.
...And 16 more matches

SubtleCrypto.deriveKey() - Web APIs
the derivekey() method of the subtlecrypto interface can be used to derive a secret key from a master key.
...it returns a promise which will be fulfilled with a cryptokey object representing the new key.
... syntax const result = crypto.subtle.derivekey( algorithm, basekey, derivedkeyalgorithm, extractable, keyusages ); parameters algorithm is an object defining the derivation algorithm to use.
...And 16 more matches

Dialogs and Prompts - Archive of obsolete content
simple dialog code the following xul code defines a simple dialog with two buttons, ok and cancel (buttons="accept,cancel" attribute on dialog).
... <?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/global.css" type="text/css"?> <dialog xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" id="..." title="..." buttons="accept,cancel" ondialogaccept="return onaccept();" ondialogcancel="return oncancel();"> <script src="chrome://..."/> <!-- content --> </dialog> you need to implement onaccept and oncancel functions in your script.
...they are: accept — ok button.
...And 15 more matches

Using IO Timeout And Interrupt On NT - Archive of obsolete content
this technical memo is a cautionary note on using netscape portable runtime's (nspr) io timeout and interrupt on windows nt 3.51 and 4.0.
... due to a limitation of the present implementation of nspr io on nt, programs must follow the following guideline: if a thread calls an nspr io function on a file descriptor and the io function fails with <tt>pr_io_timeout_error</tt> or <tt>pr_pending_interrupt_error</tt>, the file descriptor must be closed before the thread exits.
...if the thread gets interrupted by another thread's <tt>pr_interrupt()</tt> call, the io function returns with <tt>pr_pending_interrupt_error</tt>.
...And 15 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.
... prerequisites: basic computer literacy, a reasonable understanding of javascript fundamentals.
... introduction for a long time, the web platform has offered javascript programmers a number of functions that allow them to asynchronously execute code after a certain time interval has elapsed, and to repeatedly execute a block of code asynchronously until you tell it to stop.
...And 15 more matches

Script security
this page provides an overview of the script security architecture in gecko.
... like any web browser, gecko can load javascript from untrusted and potentially hostile web pages and run it on the user's computer.
... gecko has an additional problem, though: while its core is written in c++, the front-end code is written in javascript.
...And 15 more matches

The JavaScript Runtime
when scripts are compiled in interpretive mode, an internal representation of the compiled form is created and stored rather than generating a java class.
... compilation to java bytecodes for improved performance, rhino may compile javascript scripts to java bytecodes.
...each javascript script or function is compiled to a separate class.
...And 15 more matches

nsIXPCScriptable
js/src/xpconnect/idl/nsixpcscriptable.idlnot scriptable please add a summary to this article.
... last changed in gecko 1.9.1 (firefox 3.5 / thunderbird 3.0 / seamonkey 2.0) inherits from: nsisupports method overview void precreate(in nsisupports nativeobj, in jscontextptr cx, in jsobjectptr globalobj, out jsobjectptr parentobj); void create(in nsixpconnectwrappednative wrapper, in jscontextptr cx, in jsobjectptr obj); void postcreate(in nsixpconnectwrappednative wrapper, in jscontextptr cx, in jsobjectptr obj); prbool addproperty(in nsixpconnectwrappednative wrapper, in jscontextptr cx, in jsobjectptr obj, in jsval id, in jsvalptr vp); prbool delproperty(in nsixpconnectwrappednative wrapper, in jscontextptr cx, in jsobjectptr obj, in jsval id, in jsvalptr vp); prbool getproperty(in nsixpconnectwrappednative wrapper, in jscontextptr cx, in jsobjectptr obj, in jsval id...
..., in jsvalptr vp); prbool setproperty(in nsixpconnectwrappednative wrapper, in jscontextptr cx, in jsobjectptr obj, in jsval id, in jsvalptr vp); prbool enumerate(in nsixpconnectwrappednative wrapper, in jscontextptr cx, in jsobjectptr obj); prbool newenumerate(in nsixpconnectwrappednative wrapper, in jscontextptr cx, in jsobjectptr obj, in pruint32 enum_op, in jsvalptr statep, out jsid idp); prbool newresolve(in nsixpconnectwrappednative wrapper, in jscontextptr cx, in jsobjectptr obj, in jsval id, in pruint32 flags, out jsobjectptr objp); prbool convert(in nsixpconnectwrappednative wrapper, in jscontextptr cx, in jsobjectptr obj, in pruint32 type, in jsvalptr vp); void finalize(in nsixpconnectwrappednative wrapper, in jscontextptr cx, in jsobjectptr obj); prbool checkaccess(i...
...And 15 more matches

KeyframeEffectOptions - Web APIs
the keyframeeffectoptions dictionary, part of the web animations api, is used by element.animate(), keyframeeffectreadonly() and keyframeeffect() to describe timing properties for animation effects.
... these properties are all optional, although without setting a duration the animation will not play.
... properties composite optional determines how values are combined between this animation and other, separate animations that do not specify their own specific composite operation.
...And 15 more matches

RTCSessionDescription - Web APIs
the rtcsessiondescription interface describes one end of a connection—or potential connection—and how it's configured.
... each rtcsessiondescription consists of a description type indicating which part of the offer/answer negotiation process it describes and of the sdp descriptor of the session.
... the process of negotiating a connection between two peers involves exchanging rtcsessiondescription objects back and forth, with each description suggesting one combination of connection configuration options that the sender of the description supports.
...And 15 more matches

Setting up adaptive streaming media sources - Developer guides
let's say you want to set up an adaptive streaming media source on a server, to be consumed inside an html5 media element.
...this article explains how, looking at two of the most common formats: mpeg-dash and hls (http live streaming.) choosing formats in terms of adaptive streaming formats, there are many to choose from; we decided to choose the following two as between them we can support most modern browsers.
... mpeg-dash hls (http live streaming) in order to adaptively stream media we need to split the media up into chunks.
...And 15 more matches

Closures - JavaScript
in javascript, closures are created every time a function is created, at function creation time.
...however, because the code still works as expected, this is obviously not the case in javascript.
... the reason is that functions in javascript form closures.
...And 15 more matches

Functions - JavaScript
« previousnext » functions are one of the fundamental building blocks in javascript.
... a function in javascript is 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.
... see also the exhaustive reference chapter about javascript functions to get to know the details.
...And 15 more matches

Loading Content Scripts - Archive of obsolete content
this page is now obsolete, and its content has been incorporated into the main page on content scripts.
... the constructors for content-script-using objects such as panel and page-mod define a group of options for loading content scripts: contentscript string, array contentscriptfile string, array contentscriptwhen string contentscriptoptions object we have already seen the contentscript option, which enables you to pass in the text of the script itself as a string literal.
... this version of the api avoids the need to maintain a separate file for the content script.
...And 14 more matches

Inline options - Archive of obsolete content
options file the xul allowed for the inline options is limited to a few new tags.
... here is an example of an options.xul file: <?xml version="1.0"?> <!doctype mydialog system "chrome://myaddon/locale/mydialog.dtd"> <vbox xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <setting type="bool" pref="extensions.myaddon.bool" title="boolean" desc="stored as a boolean preference" /> </vbox> note that it's limited to <setting> tags.
...if you need script support, see the display notifications section.
...And 14 more matches

Install script template - Archive of obsolete content
the keys are written according to the specification: http://mozilla.org/projects/plugins/first-install-problem.html and follows the plid specification: http://mozilla.org/projects/plugins/plugin-identifier.html **/ // define some global variables var plugin_file = "npmyplugin.dll"; // this plugin consists of an xpt file because it is scriptable // http://mozilla.org/projects/plugins/scripting-plugins.html var component_file = "npmypluginscriptable.xpt"; var plugin_size = 2000; // (dll file) reserve a little extra so it is not required to update too often var component_size = 10; // (xpi file) reserve a little extra so it is not required to update too often var software_name="cult3d mozilla viewer"...
... var plid = "@myplugin.com/myplugin,version=5.3"; var version = "5.3.0.0"; var mimetype = "application/x-my-plugin"; var suffix = "my"; var suffix_description = "my plugin files"; var company_name = "mypluginco"; var plugin_description = "my exemplary plugin mine all mine"; // registry constant paths // these will be used when the win32 registry keys are written var hkey_local_machine = "hkey_local_machine"; var hkey_current_user = "hkey_current_user"; var reg_moz_path = "software\\mozillaplugins"; // my own error code in case secondary installation fails var nosecondaryinstall = 1; // error return codes need some memory var err; // error return codes when we try and install to the curr...
...ent browser var errblock1; // error return codes when we try and do a secondary installation var errblock2 = 0; // global variable containing our secondary install location var secondaryfolder; //special error values used by the cycore developers (www.cycore.com) who helped make this install script var exceptionoccurederror = -4711; var winregisnullerror = -4712; var invalidrootkeyerror = -4713; var registrykeynotwritableerror = -4714; //initinstall block //the installation is initialized here -- if we fail here, cancel the installation // initinstall is quite an overloaded method, but i have invoked it here with three strings // which are globally defined err = initinstall(software_name, plid, version); if (err != 0) { // call initinstall again in case i...
...And 14 more matches

JSException - Archive of obsolete content
summary the public class jsexception extends runtimeexception java.lang.object | +----java.lang.throwable | +----java.lang.exception | +----java.lang.runtimeexception | +----netscape.javascript.jsexception description jsexception is an exception which is thrown when javascript code returns an error.
... constructor summary the netscape.javascript.jsexception class has the following constructors: jsexception deprecated constructors optionally let you specify a detail message and other information.
... method summary the netscape.javascript.jsexception class has the following methods: getwrappedexception instance method getwrappedexception.
...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.
... prerequisites: basic computer literacy, a basic understanding of html and css, familiarity with javascript basics (see first steps and building blocks) and oojs basics (see introduction to objects).
... objective: to understand the basic theory behind object-oriented programming, how this relates to javascript ("everything is an object"), and how to create constructors and object instances.
...And 14 more matches

JS_CompileScript
compiles a script for execution.
... syntax // added in spidermonkey 45 bool js_compilescript(jscontext *cx, const char *ascii, size_t length, const js::compileoptions &options, js::mutablehandlescript script); bool js_compileucscript(jscontext *cx, const char16_t *chars, size_t length, const js::compileoptions &options, js::mutablehandlescript script); // obsolete since jsapi 39 bool js_compilescript(jscontext *cx, js::handleobject obj, const char *ascii, size_t length, const js::compileoptions &options, js::mutablehandlescript script); bool js_compileucscript(jscontext *cx, js::handleobject obj, const char16_t *chars, size_t length, ...
... const js::compileoptions &options, js::mutablehandlescript script); name type description cx jscontext * pointer to a js context from which to derive runtime information.
...And 14 more matches

JS_EvaluateScript
compile and execute a script.
... syntax jsbool js_evaluatescript(jscontext *cx, jsobject *obj, const char *src, unsigned int length, const char *filename, unsigned int lineno, jsval *rval); jsbool js_evaluateucscript(jscontext *cx, jsobject *obj, const jschar *src, unsigned int length, const char *filename, unsigned int lineno, jsval *rval); name type description cx jscontext * the context in which to run the script.
... obj jsobject * the scope in which to execute the script.
...And 14 more matches

JS_ExecuteScript
execute a compiled script.
... syntax bool js_executescript(jscontext *cx, js::handlescript script, js::mutablehandlevalue rval); // added in spidermonkey 45 bool js_executescript(jscontext *cx, js::handlescript script); // added in spidermonkey 45 bool js_executescript(jscontext *cx, js::autoobjectvector &scopechain, js::handlescript script, js::mutablehandlevalue rval); // added in spidermonkey 36 bool js_executescript(jscontext *cx, js::autoobjectvector &scopechain, js::handlescript script); // added in spidermonkey 36 bool js_executescript(jscontext *cx, js::handleobject obj, js::handlescript script, js::mutablehandlevalue rval); // obsolete since jsapi 39 bool js_executescript(jscontext *cx, js::handleobject obj, js::handlescript script); //...
... obsolete since jsapi 39 bool js::cloneandexecutescript(jscontext *cx, js::handle<jsscript*> script); // added in spidermonkey 45 bool js::cloneandexecutescript(jscontext *cx, js::handle<jsobject*> obj, js::handle<jsscript*> script); // added in spidermonkey 31, obsoleted since jsapi 39 name type description cx jscontext * the context in which to execute the script.
...And 14 more matches

nsIScriptableInputStream
xpcom/io/nsiscriptableinputstream.idlscriptable this interface provides scriptable access to a nsiinputstream instance.
...exceptions thrown ns_base_stream_closed if called after the stream has been closed.
...init() wrap the given nsiinputstream with this nsiscriptableinputstream.
...And 14 more matches

Xptcall Porting Guide
overview xptcall is a library that supports both invoking methods on arbitrary xpcom objects and implementing classes whose objects can impersonate any xpcom interface.
...this code needs to be ported to all platforms that want to support xptcall (and thus mozilla).
... the tree mozilla/xpcom/reflect/xptcall +--public // exported headers +--src // core source | \--md // platform specific parts | +--mac // mac ppc | +--unix // all unix | \--win32 // win32 | +--test // simple tests to get started \--tests // full tests via api porters are free to create subdirectories under the base md directory for their given platforms and to integrate into the build system as appropriate for their platform.
...And 14 more matches

Basic concepts - Web APIs
about this document this introduction discusses essential concepts and terminology in indexeddb.
... it gives you the big picture and explains key concepts.
... you'll find the following useful: for an overview of the design and structure of indexeddb, see big concepts.
...And 14 more matches

Digital audio concepts - Web media technologies
the first factor affecting the fidelity of the captured audio is the audio bandwidth; that is, the range of audio frequencies the a/d converter is capable of capturing and converting into digital form.
...this analog signal is then converted into digital form by a circuit that captures the incoming wave's amplitude at regular intervals, converting that data into a number in a form that is understood by the audio recording system.
... each of these captured moments is a sample.
...And 14 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 most significant change in javascript 1.3 was compliance with ecma-262 and unicode by removing inconsistencies between javascript 1.2 and the new ecma standard (which was published in june 1997).
... additional features of version 1.2, at the time not specified by ecma-262 were kept in the javascript language (see below for a list of differences).
...And 13 more matches

Limitations of chrome scripts
the fix is generally some variant of "do that in a frame script loaded into the content process".
... this is one of a pair of articles: the other one lists limitations of frame scripts.
...in this case, the shim will return a javascript object that looks somewhat like a window or a document for about:blank.
...And 13 more matches

Communicating with frame scripts
chrome code and frame scripts communicate back and forth using a messaging api which can include json-serializable objects as arguments.
... the api is mostly symmetrical, with one major exception: frame scripts can send asynchronous or synchronous messages to chrome, but chrome can only send asynchronous messages to content.
... where absolutely necessary, frame scripts can pass wrappers called cross process object wrappers (also known as cpows) to chrome, and chrome can use these wrappers to get synchronous access to content objects.
...And 13 more matches

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.
...in the case where the c++ object has class info (nsiclassinfo), the jsobject is a more or less empty jsobject which is not really that special.
... all the methods that are supposed to show up on this jsobject are actually not properties of the object itself, but rather properties of the prototype of the jsobject for the wrapper (unless the c++ object's class info has the flag nsixpcscriptable::dont_share_prototype set, but lets assume that's not the case here).
...And 13 more matches

PR_Interrupt
sets the interrupt request for a target thread.
... syntax #include <prthread.h> prstatus pr_interrupt(prthread *thread); parameter pr_interrupt has the following parameter: thread the thread whose interrupt request you want to set.
... description the purpose of pr_interrupt is to request that a thread performing some task stop what it is doing and return to some control point.
...And 13 more matches

Rhino JavaScript compiler
overview the javascript compiler translates javascript source into java class files.
... the resulting java class files can then be loaded and executed at another time, providing a convenient method for transferring javascript, and for avoiding translation cost.
... note that the top-level functions available to the shell (such as print) are not available to compiled scripts when they are run outside the shell.
...And 13 more matches

How to embed the JavaScript engine
a bare bones tutorial hello world sample embedding application the following code is a very simple application that shows how to embed spidermonkey and run a simple javascript script.
... jsautorequest ar(cx); // in practice, you would want to exit this any // time you're spinning the event loop js::rootedobject global(cx, js_newglobalobject(cx, &global_class, nullptr)); if (!global) return 1; js::rootedvalue rval(cx); { // scope for jsautocompartment jsautocompartment ac(cx, global); js_initstandardclasses(cx, global); const char *script = "'hello'+'world, it is '+new date()"; const char *filename = "noname"; int lineno = 1; bool ok = js_evaluatescript(cx, global, script, strlen(s...
...cript), filename, lineno, rval.address()); if (!ok) return 1; } jsstring *str = rval.tostring(); printf("%s\n", js_encodestring(cx, str)); } js_destroycontext(cx); js_destroyruntime(rt); js_shutdown(); return 0; } spidermonkey 31 // following code might be needed in some case // #define __stdc_limit_macros // #include <stdint.h> #include "jsapi.h" /* the class of the global object.
...And 13 more matches

nsINavHistoryQueryOptions
toolkit/components/places/nsinavhistoryservice.idlscriptable represents the global options for executing a query.
... 1.0 66 introduced gecko 1.9 inherits from: nsisupports last changed in gecko 13.0 (firefox 13.0 / thunderbird 13.0 / seamonkey 2.10) method overview nsinavhistoryqueryoptions clone(); attributes attribute type description applyoptionstocontainers boolean if true, the query options are only applied to the containers.
... asyncenabled boolean when true, the root container node generated by these options and all of its descendant containers are opened asynchronously if they support doing so.
...And 13 more matches

SubtleCrypto.exportKey() - Web APIs
the exportkey() method of the subtlecrypto interface exports a key: that is, it takes as input a cryptokey object and gives you the key in an external, portable format.
... to export a key, the key must have cryptokey.extractable set to true.
... keys can be exported in several formats: see supported formats in the subtlecrypto.importkey() page for details.
...And 13 more matches

HTML attribute: accept - HTML: Hypertext Markup Language
the accept attribute takes as its value a comma-separated list of one or more file types, or unique file type specifiers, describing which file types to allow.
... the accept property is an attribute of the file <input> type.
... because a given file type may be identified in more than one manner, it's useful to provide a thorough set of type specifiers when you need files of specific type, or use the wild card to denote a type of any format is acceptable.
...And 13 more matches

Equality comparisons and sameness - JavaScript
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).
... object.is does no type conversion and no special handling for nan, -0, and +0 (giving it the same behavior as === except on those special numeric values).
... note that the distinction between these all have to do with their handling of primitives; none of them compares whether the parameters are conceptually similar in structure.
...And 13 more matches

Functions - JavaScript
in javascript, functions are first-class objects, because they can have properties and methods just like any other object.
... for more examples and explanations, see also the javascript guide about functions.
... description every function in javascript is a function object.
...And 13 more matches

Two Types of Scripts - Archive of obsolete content
on the web, javascript executes in the context of a web page, and has access to that page's dom content.
... this enables you to call functions like: window.alert("hello there"); in an add-on's main scripts you can't do that, because the add-on code does not execute in the context of a page, and the dom is therefore not available.
... if you need to access the dom of a particular page, you need to use a content script.
...And 12 more matches

Chapter 4: Using XPCOM—Implementing advanced processes - Archive of obsolete content
this chapter explains how to use xpcom to implement advanced processes using only javascript.
... introduction javascript lacks functions for opening files and character-code conversion, among other things.
... calling xpcom from xpconnect use the xpconnect technology to use xpcom in javascript.
...And 12 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.
... get started prerequisites before starting this module, you don't need any previous javascript knowledge, but you should have some familiarity with html and css.
... you are advised to work through the following modules before starting on javascript: getting started with the web (which includes a really basic javascript introduction).
...And 12 more matches

JS_ExecuteScriptPart
obsolete since javascript 1.9.3this feature is obsolete.
... js_executescriptpart has been removed in bug 555104.
... use js_executescript instead.
...And 12 more matches

JS_SetInterruptCallback
this article covers features introduced in spidermonkey 31 set a callback function that is automatically called periodically while javascript code runs.
... syntax jsinterruptcallback js_setinterruptcallback(jsruntime *rt, jsinterruptcallback callback); jsinterruptcallback js_getinterruptcallback(jsruntime *rt); void js_requestinterruptcallback(jsruntime *rt); name type description rt jsruntime * the runtime.
... callback jsinterruptcallback the callback function to install.
...And 12 more matches

nsIAuthPrompt
netwerk/base/public/nsiauthprompt.idlscriptable this interface allows the networking layer to pose a user/password prompt to obtain the values needed for authentication.
... inherits from: nsisupports last changed in gecko 1.9 (firefox 3) this interface is implemented by @mozilla.org/login-manager/prompter;1.
... to create an instance, use: var authprompt = components.classes["@mozilla.org/login-manager/prompter;1"] .createinstance(components.interfaces.nsiauthprompt); method overview boolean prompt(in wstring dialogtitle, in wstring text, in wstring passwordrealm, in pruint32 savepassword, in wstring defaulttext, out wstring result); boolean promptpassword(in wstring dialogtitle, in wstring text, in wstring passwordrealm, in pruint32 savepassword, inout wstring pwd); boolean promptusernameandpassword(in wstring dialogtitle, in wstring text, in wstring passwordrealm, in pruint32 savepassword, inout wstring user, inout wstring pwd); constants constant value description save_password_never 0 never saves the password.
...And 12 more matches

nsICryptoHash
netwerk/base/public/nsicryptohash.idlscriptable this interface can be used to compute a cryptographic hash function of some data.
...the values map directly onto the values defined in mozilla/security/nss/lib/cryptohi/hasht.h.
... constant value description md2 1 message digest algorithm 2 md5 2 message-digest algorithm 5 sha1 3 secure hash algorithm 1 sha256 4 secure hash algorithm 256 sha384 5 secure hash algorithm 384 sha512 6 secure hash algorithm 512 methods finish() completes the hash object and produces the actual hash data.
...And 12 more matches

RTCSessionDescription() - Web APIs
the rtcsessiondescription() constructor creates a new rtcsessiondescription with its properties initialized as described in the specified object.
... this constructor has been deprecated because rtcpeerconnection.setlocaldescription() and other methods which take sdp as input now directly accept an object conforming to the rtcsessiondescriptioninit dictionary, so you don't have to instantiate an rtcsessiondescription yourself.
... syntax sessiondescription = new rtcsessiondescription(rtcsessiondescriptioninit); values rtcsessiondescriptioninit optional an object providing the default values for the session description; the object conforms to the rtcsessiondescriptioninit dictionary.
...And 12 more matches

Unicode property escapes - JavaScript
for instance, unicode property escapes can be used to match emojis, punctuations, letters (even letters from specific languages or scripts), etc.
... // non-binary values \p{unicodepropertyvalue} \p{unicodepropertyname=unicodepropertyvalue} // binary and non-binary values \p{unicodebinarypropertyname} // negation: \p is negated \p \p{unicodepropertyvalue} \p{unicodebinarypropertyname} general_category (gc) script (sc) script_extensions (scx) see also propertyvaluealiases.txt unicodebinarypropertyname the name of a binary property.
... note: as there are many properties and values available, we will not describe them exhaustively here but rather provide various examples rationale before es2018 there was no performance-efficient way to match characters from different sets based on scripts (like macedonian, greek, georgian etc.) or propertyname (like emoji etc) in javascript.
...And 12 more matches

Using Promises - JavaScript
since most people are consumers of already-created promises, this guide will explain consumption of returned promises before explaining how to create them.
... guarantees unlike old-fashioned passed-in callbacks, a promise comes with some guarantees: callbacks will never be called before the completion of the current run of the javascript event loop.
...lback); with modern functions, we attach our callbacks to the returned promises instead, forming a promise chain: dosomething() .then(function(result) { return dosomethingelse(result); }) .then(function(newresult) { return dothirdthing(newresult); }) .then(function(finalresult) { console.log('got the final result: ' + finalresult); }) .catch(failurecallback); the arguments to then are optional, and catch(failurecallback) is short for then(null, failurecallback).
...And 12 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.
... description arrays are list-like objects whose prototype has methods to perform traversal and mutation operations.
... neither the length of a javascript array nor the types of its elements are fixed.
...And 12 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.
... replacer optional a function that alters the behavior of the stringification process, or an array of string and number that serve as an allowlist for selecting/filtering the properties of the value object to be included in the json string.
... space optional a string or number object that's used to insert white space into the output json string for readability purposes.
...And 12 more matches

JSON - JavaScript
the json object contains methods for parsing javascript object notation (json) and converting values to json.
... description javascript and json differences json is a syntax for serializing objects, arrays, numbers, strings, booleans, and null.
... it is based upon javascript syntax but is distinct from it: some javascript is not json.
...And 12 more matches

promptBox - Archive of obsolete content
the promptbox object represents the tab-modal prompts (or alerts) on a given tab.
... it's returned by the tabbrowser method gettabmodalpromptbox method.
... a tab may have multiple prompts on it; the tabmodalpromptshowing attribute on the tabbrowser will tell you how many prompts a given tab has.
...And 11 more matches

Handling text — strings in JavaScript - Learn web development
in this article, 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.
... prerequisites: basic computer literacy, a basic understanding of html and css, an understanding of what javascript is.
... objective: to gain familiarity with the basics of strings in javascript.
...And 11 more matches

What went wrong? Troubleshooting JavaScript - Learn web development
never fear — this article aims to save you from tearing your hair out over such problems by providing you with some tips on how to find and fix errors in javascript programs.
... prerequisites: basic computer literacy, a basic understanding of html and css, an understanding of what javascript is.
... an erroneous example to get started, let's return to our number guessing game — except this time we'll be exploring a version that has some deliberate errors introduced.
...And 11 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.
... how do they relate to "vanilla" javascript or html?
... after that, we'll provide some tutorials covering the essentials of some of the different framework choices, to provide you with enough context and familiarity to start going into greater depth yourself.
...And 11 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.
... modules can also be used to create global javascript singletons that previously required using javascript xpcom objects.
... a javascript code module is simply some javascript code located in a registered location.
...And 11 more matches

PublicKeyCredentialCreationOptions - Web APIs
the publickeycredentialcreationoptions dictionary of the web authentication api holds options passed to navigators.credentials.create() in order to create a publickeycredential.
... properties publickeycredentialcreationoptions.rp an object describing the relying party which requested the credential creation.
... publickeycredentialcreationoptions.user an object describing the user account for which the credential is generated.
...And 11 more matches

SubtleCrypto.sign() - Web APIs
the sign() method of the subtlecrypto interface generates a digital signature.
... you can use the corresponding subtlecrypto.verify() method to verify the signature.
... syntax const signature = crypto.subtle.sign(algorithm, key, data); parameters algorithm is a string or object that specifies the signature algorithm to use and its parameters: to use rsassa-pkcs1-v1_5, pass the string "rsassa-pkcs1-v1_5" or an object of the form { "name": "rsassa-pkcs1-v1_5" }.
...And 11 more matches

XRWebGLLayerInit.ignoreDepthValues - Web APIs
the xrwebgllayerinit dictionary's boolean ignoredepthvalues property can be provided in the options passed into the xrwebgllayer() constructor to indicate that the depth buffer, if it exists, should be ignored while composing the scene.
... the depth buffer is typically used to assist in ordering vertices and, by extension, polygons while compositing, to ensure that the scene is correctly composited, with objects the correct distance away and with clipping and other distance-related computations performed as accurately as possible.
... without the depth buffer, these computations must rely entirely on the coordinates of each pixel.
...And 11 more matches

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.
... runtime concepts the following sections explain a theoretical model.
... modern javascript engines implement and heavily optimize the described semantics.
...And 11 more matches

Memory Management - JavaScript
in contrast, javascript automatically allocates memory when objects are created and frees it when they are not used anymore (garbage collection).
...the first and last parts are explicit in low-level languages but are mostly implicit in high-level languages like javascript.
... allocation in javascript value initialization in order to not bother the programmer with allocations, javascript will automatically allocate memory when values are initially declared.
...And 11 more matches

Array.prototype.toLocaleString() - JavaScript
syntax arr.tolocalestring([locales[, options]]); parameters locales optional a string with a bcp 47 language tag, or an array of such strings.
... options optional an object with configuration properties, for numbers see number.prototype.tolocalestring(), and for dates see date.prototype.tolocalestring().
... polyfill // https://tc39.github.io/ecma402/#sup-array.prototype.tolocalestring if (!array.prototype.tolocalestring) { object.defineproperty(array.prototype, 'tolocalestring', { value: function(locales, options) { // 1.
...And 11 more matches

String.prototype.match() - JavaScript
if you don't give any parameter and use the match() method directly, you will get an array with an empty string: [""].
... if the g flag is used, all results matching the complete regular expression will be returned, but capturing groups will not.
... if the g flag is not used, only the first complete match and its related capturing groups are returned.
...And 11 more matches

throw - JavaScript
the throw statement throws a user-defined exception.
... description use the throw statement to throw an exception.
... when you throw an exception, expression specifies the value of the exception.
...And 11 more matches

Chapter 6: Firefox extensions and XUL applications - Archive of obsolete content
matsuzawa-san is a co-author of firefox 3 hacks (o'reilly japan, 2008.) this chapter discusses tools to assist in developing extensions.
... venkman, the javascript debugger venkman is a full-fledged javascript debugger that runs inside firefox.
... also, because it works with the javascript in extensions and firefox itself, the debugger can be a good way to learn about design methods.
...And 10 more matches

JavaScript Client API - Archive of obsolete content
overview this page describes how to use the internal client-side sync javascript api.
... further, you agree (a) to maintain and link to (including on websites from which your third party client may be downloaded) a separate, conspicuous, and reasonably detailed privacy policy detailing how data collected or transmitted by your third party client is managed and protected; (b) that your third party client will only store data in encrypted form on the firefox sync servers operated by mozilla; (c) that you and your third party client will use the firefox sync apis solely for their intended purpose; (d) that your third party client will not hide or mask its identity as it uses the services and/or firefox sync apis, including by failing to follow required identification conventions; and (e) that you and your third party client will ...
...not use the firefox sync apis for any application or service that replicates or attempts to replicate the services or firefox sync experience unless such use is non-confusing (by non-confusing, we mean that people should always know with whom they are dealing and where the information or software they are downloading came from).
...And 10 more matches

Running Tamarin acceptance tests - Archive of obsolete content
the tamarin acceptance tests can be used to verify your installation and or local changes that you have made to the source.
... to run acceptance tests on the android shell see the "testing the android shell" heading below.
... $ cd tamarin-redux/test/acceptance $ export asc=/users/build/hg/tamarin-redux/utils/asc.jar $ export builtinabc=/users/build/hg/tamarin-redux/generated/builtin.abc $ export shellabc=/users/build/hg/tamarin-redux/generated/shell_toplevel.abc $ export avm=/users/build/hg/tamarin-redux/objdir-release/shell/avmshell $ python runtests.py tamarin tests started: 2010-09-28 10:37:06.410676 current configuration: x64-mac-tvm-release av...
...And 10 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.
... prerequisites: basic computer literacy, a reasonable understanding of javascript fundamentals.
... objective: to gain familiarity with what asynchronous javascript is, how it differs from synchronous javascript, and what use cases it has.
...And 10 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.
...the object-based nature of javascript is important to understand if you want to go further with your knowledge of the language, therefore we've provided this module to help you.
...you are advised to work through the introduction to html and introduction to css modules before starting on javascript.
...And 10 more matches

JavaScript code modules
note: these are not the same thing as standard javascript modules.
... javascript code modules let multiple privileged javascript scopes share code.
... general topics using javascript code modules an introduction to how to use javascript code modules.
...And 10 more matches

Emscripten
emscripten is an llvm to javascript compiler.
...generated from c/c++ using clang, or from another language) and compiles that into javascript, which can be run on the web.
... important: this page provides a very brief introduction to what emscripten is.
...And 10 more matches

Rhino optimization
optimization settings the currently supported optimization settings are: -1 interpretive mode is always used.
...also, you must use this optimization level if your code uses continuation objects.
... if the optimization package is not available, then optimization acts as if it is always -1.
...And 10 more matches

JS_NewScriptObject
return the javascript script object that wraps a compiled script.
... the compiled script and its parts live until the script object is garbage collected.
... syntax jsobject * js_newscriptobject(jscontext *cx, jsscript *script); name type description cx jscontext * the context in which to create the new script object.
...And 10 more matches

Running Automated JavaScript Tests
developers will often want to use the -d option: jstests.py -d path_to_js_shell the -d option skips tests that are marked as randomly failing; random failures are usually just noise when being run for day-to-day developer testing.
...or you can run all but selected tests with the --exclude option.
...for a smoke test or if you are not changing language-level functionality, you may wish to use jstests.py path_to_js_shell --exclude=test262 other options allow you to show the test command lines being run, command output and return codes, run tests named in a given file, exclude tests named in a given file, hide the progress bar, change the timeout, run skipped tests, print output in tinderbox format, run a test in the debugger, or run tests in valgrind.
...And 10 more matches

RefPtr
refptr (formerly known as nsrefptr, see bug 1207245) is a general class to implement reference counting pointers for objects.
... it is similar to nscomptr, but does not require that the type be an xpcom interface.
... like with nscomptr, it is the responsibility of the object itself to implement reference counting.
...And 10 more matches

Using tab-modal prompts
the updated prompt documentation can be found in the firefox source docs.
... prior to gecko 2.0 (firefox 4 / thunderbird 3.3 / seamonkey 2.1), prompts (that is, alerts and other modal prompts) were window modal.
... that is, when an alert occurred, it blocked the user interface on all tabs in the window until the user dismissed the prompt.
...And 10 more matches

CryptoKey - Web APIs
the cryptokey interface of the web crypto api represents a cryptographic key obtained from one of the subtlecrypto methods generatekey(), derivekey(), importkey(), or unwrapkey().
... for security reasons, the cryptokey interface can only be used in a secure context.
... properties cryptokey.type string which may take one of the following values: "secret": this key is a secret key for use with a symmetric algorithm.
...And 10 more matches

HTMLSelectElement.selectedOptions - Web APIs
the read-only htmlselectelement property selectedoptions contains a list of the <option> elements contained within the <select> element that are currently selected.
... the list of selected options is an htmlcollection object with one entry per currently selected option.
... an option is considered selected if it has an htmloptionelement.selected attribute.
...And 10 more matches

ImageCapture - Web APIs
the imagecapture interface of the mediastream image capture api provides methods to enable the capture of images or photos from a camera or other photographic device.
... it provides an interface for capturing images from a photographic device referenced through a valid mediastreamtrack.
... constructor imagecapture() creates a new imagecapture object which can be used to capture still frames (photos) from a given mediastreamtrack which represents a video stream.
...And 10 more matches

SubtleCrypto.generateKey() - Web APIs
use the generatekey() method of the subtlecrypto interface to generate a new key (for symmetric algorithms) or key pair (for public-key algorithms).
... syntax const result = crypto.subtle.generatekey(algorithm, extractable, keyusages); parameters algorithm is a dictionary object defining the type of key to generate and providing extra algorithm-specific parameters.
... extractable is a boolean indicating whether it will be possible to export the key using subtlecrypto.exportkey() or subtlecrypto.wrapkey().
...And 10 more matches

XRWebGLLayer.ignoreDepthValues - Web APIs
the read-only xrwebgllayer property ignoredepthvalues is a boolean value which is true if the session has been configured to ignore the values in the depth buffer while rendering the scene.
... if the depth buffer is being used to determine the position of vertices, this property is false.
... the value of ignoredepthvalues can only be set when the xrwebgllayer is instantiated, by setting the corresponding value in the xrwebgllayerinit object specified as the constructor's layerinit parameter.
...And 10 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.
... numbers in javascript, numbers are implemented in double-precision 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).
... a more recent addition to javascript is bigint which lets you represent integers that may be very large.
...And 10 more matches

Regular expression syntax cheatsheet - JavaScript
has one of the following meanings: matches any single character except line terminators: \n, \r, \u2028 or \u2029.
... (x) capturing group: matches x and remembers the match.
... a regular expression may have multiple capturing groups.
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Groups and ranges - JavaScript
(x) capturing group: matches x and remembers the match.
... a regular expression may have multiple capturing groups.
... in results, matches to capturing groups typically in an array whose members are in the same order as the left parentheses in the capturing group.
...And 10 more matches

Array.prototype.reduce() - JavaScript
syntax arr.reduce(callback( accumulator, currentvalue, [, index[, array]] )[, initialvalue]) parameters callback a function to execute on each element in the array (except for the first, if no initialvalue is supplied).
... index optional the index of the current element being processed in the array.
... array optional the array reduce() was called upon.
...And 10 more matches

Error - JavaScript
the error object can also be used as a base object for user-defined exceptions.
... description runtime errors result in new error objects being created and thrown.
... error types besides the generic error constructor, there are seven other core error constructors in javascript.
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String.prototype.split() - JavaScript
syntax str.split([separator[, limit]]) parameters separator optional the pattern describing where each split should occur.
... the result is an empty (i.e.
... if separator is an empty string (""), str is converted to an array of each of its utf-16 "characters".
...And 10 more matches

parseInt() - JavaScript
radix optional an integer between 2 and 36 that represents the radix (the base in mathematical numeral systems) of the string.
... the description below explains in more detail what happens when radix is not provided.
... description the parseint function converts its first argument to a string, parses that string, then returns an integer or nan.
...And 10 more matches

Object initializer - JavaScript
syntax let o = {} let o = {a: 'foo', b: 42, c: {}} let a = 'foo', b = 42, c = {} let o = {a: a, b: b, c: c} let o = { property: function (parameters) {}, get property() {}, set property(value) {} }; new notations in ecmascript 2015 please see the compatibility table for support for these notations.
... // shorthand property names (es2015) let a = 'foo', b = 42, c = {}; let o = {a, b, c} // shorthand method names (es2015) let o = { property(parameters) {} } // computed property names (es2015) let prop = 'foo' let o = { [prop]: 'hey', ['b' + 'ar']: 'there' } description an object initializer is an expression that describes the initialization of an object.
... object literal notation vs json the object literal notation is not the same as the javascript object notation (json).
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switch - JavaScript
case valuen optional a case clause used to match against expression.
... default optional a default clause; if provided, this clause is executed if the value of expression doesn't match any of the case clauses.
... description a switch statement first evaluates its expression.
...And 10 more matches

Introduction to using XPath in JavaScript - XPath
this document describes the interface for using xpath in javascript internally, in extensions, and from websites.
...note that, if the xpathexpression contains a namespace prefix, this will result in a domexception being thrown with the code namespace_err.
... notes adapts any dom node to resolve namespaces so that an xpath expression can be easily evaluated relative to the context of the node where it appeared within the document.
...And 10 more matches

New in JavaScript 1.8.5 - Archive of obsolete content
the following is a changelog for javascript 1.8.5.
... new features in javascript 1.8.5 new functions function description object.create() creates a new object with the specified prototype object and properties.
... bug 492840 object.defineproperty() adds the named property described by a given descriptor to an object.
...And 9 more matches

Visual typescript game engine - Game development
project : visual typescript game engine version: sunshine - 2019 2d canvas game engine based on matter.js 2d physics engine for the web.
... written in typescript current version 3.1.3.
... find configuration at ./src/lib/client-config.ts /** * addson * all addson are ansync loaded scripts.
...And 9 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.
... javascript should not be confused with the java programming language.
... although "java" and "javascript" are trademarks (or registered trademarks) of oracle in the u.s.
...And 9 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.
... you should understand these concepts before working through the other articles in the module.
... prerequisites: basic computer literacy, a reasonable understanding of javascript fundamentals.
...And 9 more matches

Frame script environment
the frame script's global is a contentframemessagemanager, giving it the following environment: content the dom window of the content loaded in the browser may be null (see below) docshell the nsidocshell associated with the browser.
... in particular, note that a frame script accesses the dom window using content, not window: // frame script var links = content.document.getelementsbytagname("a"); all of the frame scripts running in a tab share this global.
... however, any top-level variables defined by a script are not stored on the global: instead, top-level variables are stored in a special per-script object that delegates to the per-tab global.
...And 9 more matches

JS_ExecuteScriptVersion
this article covers features introduced in spidermonkey 1.8.5 execute a compiled script with specified version.
... syntax jsbool js_executescriptversion(jscontext *cx, jsobject *obj, jsobject *scriptobj, jsval *rval, jsversion version); name type description cx jscontext * the context in which to execute the script.
... obj jsobject * the scope in which to execute the script.
...And 9 more matches

nsILoginManagerCrypto
toolkit/components/passwordmgr/public/nsiloginmanagercrypto.idlscriptable please add a summary to this article.
... 1.0 66 introduced gecko 2.0 inherits from: nsisupports last changed in gecko 2.0 (firefox 4 / thunderbird 3.3 / seamonkey 2.1) method overview astring decrypt(in astring ciphertext); astring encrypt(in astring plaintext); attributes attribute type description isloggedin boolean current login state of the token used for encryption.
... if the user is not logged in, performing a crypto operation will result in a master password prompt.
...And 9 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.
... this means that long-running javascript functions can block the thread, leading to an unresponsive page and a bad user experience.
... you can use the frame rate and waterfall tools to see when javascript is causing performance problems, and to single out the particular functions that need attention.
...And 9 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.
... single-line mode for single-line entry, you can type javascript expressions in the field at the bottom of the console log, at the >> prompt.
... to enter expressions in single-line mode, type at the prompt and press enter.
...And 9 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.
... example: creating an html table dynamically (sample1.html) html <input type="button" value="generate a table." onclick="generate_table()"> javascript function generate_table() { // get the reference for the body var body = document.getelementsbytagname("body")[0]; // creates a <table> element and a <tbody> element var tbl = document.createelement("table"); var tblbody = document.createelement("tbody"); // creating all cells for (var i = 0; i < 2; i++) { // creates a table row var row = document.createelement("tr"); ...
... here's the html markup generated by the javascript code: ...
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Option() - Web APIs
the option() constructor creates a new htmloptionelement.
... syntax var optionelementreference = new option(text, value, defaultselected, selected); parameters text optional a domstring representing the content of the element, i.e.
...if this is not specified, a default value of "" (empty string) is used.
...And 9 more matches

caption-side - CSS: Cascading Style Sheets
the caption-side css property puts the content of a table's <caption> on the specified side.
... syntax /* directional values */ caption-side: top; caption-side: bottom; /* warning: non-standard values */ caption-side: left; caption-side: right; caption-side: top-outside; caption-side: bottom-outside; /* global values */ caption-side: inherit; caption-side: initial; caption-side: unset; the caption-side property is specified as one of the keyword values listed below.
... values top the caption box should be positioned above the table.
...And 9 more matches

<dl>: The Description List element - HTML: Hypertext Markup Language
the html <dl> element represents a description list.
... the element encloses a list of groups of terms (specified using the <dt> element) and descriptions (provided by <dd> elements).
... permitted content either: zero or more groups each consisting of one or more <dt> elements followed by one or more <dd> elements, optionally intermixed with <script> and <template> elements.
...And 9 more matches

X-Frame-Options - HTTP
the x-frame-options http response header can be used to indicate whether or not a browser should be allowed to render a page in a <frame>, <iframe>, <embed> or <object>.
... the added security is provided only if the user accessing the document is using a browser that supports x-frame-options.
... header type response header forbidden header name no syntax there are two possible directives for x-frame-options: x-frame-options: deny x-frame-options: sameorigin directives if you specify deny, not only will attempts to load the page in a frame fail when loaded from other sites, attempts to do so will fail when loaded from the same site.
...And 9 more matches

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.
...with the help of these two objects you are able to program at the meta level of javascript.
... proxies introduced in ecmascript 6, proxy objects allow you to intercept certain operations and to implement custom behaviors.
...And 9 more matches

Array.prototype.map() - JavaScript
the callback function accepts the following arguments: currentvalue the current element being processed in the array.
... indexoptional the index of the current element being processed in the array.
... arrayoptional the array map was called upon.
...And 9 more matches

Function.prototype.bind() - JavaScript
arg1, arg2, ...argn optional arguments to prepend to arguments provided to the bound function when invoking func.
... description the bind() function creates a new bound function, which is an exotic function object (a term from ecmascript 2015) that wraps the original function object.
... thus, presented below are two options for function.prototype.bind() polyfills: the first one is much smaller and more performant, but does not work when using the new operator.
...And 9 more matches

OpenSearch description format
the opensearch description format lets a website describe a search engine for itself, so that a browser or other client application can use that search engine.
... opensearch description files can be advertised as described in autodiscovery of search plugins, and can be installed programmatically as described in adding search engines from web pages.
... opensearch description file the xml file that describes a search engine follows the basic template below.
...And 9 more matches

Chapter 2: Technologies used in developing extensions - Archive of obsolete content
the role of each technology firefox is largely built using four technologies: xul, css, javascript, and xpcom.
...these issues are discussed in chapter 5.
... xml coding css coding basic javascript syntax xml: a text-based structural language extensible markup language (xml) is a meta-language for expressing various kinds of data.
...And 8 more matches

Install Scripts - Archive of obsolete content
« previousnext » this section describes the install script.
... creating an install script note: for firefox extensions, install.js are no longer used.
...the install script is even flexible enough to allow you to uninstall files.
...And 8 more matches

Theme concepts
these theme options can be implemented as static themes (although the theme images themselves may be animated) or as dynamic themes created in a browser extension.
...additionally, firefox color can be used to preview customizations to the browser's theme with options to share and export a theme.
... single image themes this is the basic or minimal theming option, where you define: a single image, which is anchored to the top right of the header area.
...And 8 more matches

Creating JavaScript callbacks in components
these interfaces are used to manipulate the component in c++ and javascript.
...here is a very simple example of the observer pattern: [scriptable, uuid(...)] interface stringparserobserver { void onword(string word); }; [scriptable, uuid(...)] interface stringparser { void parse(string data); void addobserver(stringparserobserver observer); }; in this example, the stringparser will call the stringparserobserver.onword method whenever it finishes parsing a word found in the raw string data.
...javascript functions as callbacks another common use of the pattern is found in addeventlistener / removeeventlistener.
...And 8 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.
... web console this is the first place to go when you're debugging a web page; open the web console using the web console option in the web developer menu.
... this shows any javascript errors in your app, as well as any logging calls from the console api.
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Frame script environment
the frame script's global is a contentframemessagemanager, giving it the following environment: content the dom window of the content loaded in the browser.
... in particular, note that a frame script accesses the dom window using content, not window: // frame script var links = content.document.getelementsbytagname("a"); all the frame scripts running in a tab share this global.
... however, any top-level variables defined by a script are not stored on the global: instead, top-level variables are stored in a special per-script object that delegates to the per-tab global.
...And 8 more matches

Limitations of frame scripts
frame scripts run with system privileges and have access to the components object, enabling them to use xpcom objects and jsms.
...however, some apis that work in the chrome process will not work in a frame script.
... this is one of a pair of articles: the other one lists limitations of chrome scripts.
...And 8 more matches

JSPropertyDescriptor
a descriptor is used to declare whether an attribute can be written to whether it can delete an object that can enumerate and specify content.
... properties a descriptor is an object that can have the following key values field name description getter the get syntax binds an object property to a function that will be called when that property is looked up.
... setter the set syntax binds an object property to a function to be called when there is an attempt to set that property.
...And 8 more matches

JS_IsExceptionPending
determine whether an exception is pending in the js engine.
... syntax bool js_isexceptionpending(jscontext *cx); name type description cx jscontext * pointer to a js context to check for pending exceptions.
... description js_isexceptionpending returns true if an exception has been thrown in the context cx and the exception has not yet been caught or cleared.
...And 8 more matches

Xptcall Porting Status
this is a status page for the multiplatform porting of xptcall.
... xptcall has a faq and a porting guide.
...feel free to email me with questions or to volunteer to contribute xptcall code for any platform.
...And 8 more matches

Scripting plugins - Plugins
this document also explains how to make a plugin use these new extensions to be scriptable as well as how to access objects in a browser.
... (a bit of history: npapi plugins that used to take advantage of being scriptable via liveconnect in 4.x netscape browsers lost this possibility in mozilla (due to the jni making the netscape 4.x jri obsolete).
... as an answer to this large gap in the netscape plugin api, an extension to the api has been developed that lets plugins be scriptable again, independent of java.
...And 8 more matches

AudioWorkletProcessor.parameterDescriptors (static getter) - Web APIs
the read-only parameterdescriptors property of an audioworkletprocessor-derived class is a static getter, which returns an iterable of audioparamdescriptor-based objects.
... defining the getter is optional.
... syntax audioworkletprocessorsubclass.parameterdescriptors; value an iterable of audioparamdescriptor-based objects.
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DOMException - Web APIs
the domexception interface represents an abnormal event (called an exception) that occurs as a result of calling a method or accessing a property of a web api.
... each exception has a name, which is a short "camelcase" style string identifying the error or abnormal condition.
... constructor domexception() returns a domexception object with a specified message and name.
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MediaStream Image Capture API - Web APIs
the mediastream image capture api is an api for capturing images or videos from a photographic device.
... in addition to capturing data, it also allows you to retrieve information about device capabilities such as image size, red-eye reduction and whether or not there is a flash and what they are currently set to.
... mediastream image capture concepts and usage the process of retrieving an image or video stream happens as described below.
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PublicKeyCredentialRequestOptions - Web APIs
the publickeycredentialrequestoptions dictionary of the web authentication api holds the options passed to navigator.credentials.get() in order to fetch a given publickeycredential.
... properties publickeycredentialrequestoptions.challenge a buffersource, emitted by the relying party's server and used as a cryptographic challenge.
... publickeycredentialrequestoptions.timeout optional a numerical hint, in milliseconds, which indicates the time the caller is willing to wait for the retrieval operation to complete.
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ServiceWorkerGlobalScope: pushsubscriptionchange event - Web APIs
the pushsubscriptionchange event is sent to the global scope of a serviceworker to indicate a change in push subscription that was triggered outside the application's control.
... this may occur if the subscription was refreshed by the browser, but it may also happen if the subscription has been revoked or lost.
... bubbles no cancelable no interface pushsubscriptionchangeevent event handler property onpushsubscriptionchange usage notes although examples demonstrating how to share subscription related information with the application server tend to use fetch(), this is not necessarily the best choice for real-world use, since it will not work if the app is offline, for example.
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SubtleCrypto.deriveBits() - Web APIs
the derivebits() method of the subtlecrypto interface can be used to derive an array of bits from a base key.
... this method is very similar to subtlecrypto.derivekey(), except that derivekey() returns a cryptokey object rather than an arraybuffer.
... syntax const result = crypto.subtle.derivebits( algorithm, basekey, length ); parameters algorithm is an object defining the derivation algorithm to use.
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SubtleCrypto.digest() - Web APIs
the digest() method of the subtlecrypto interface generates a digest of the given data.
...cryptographic digests should exhibit collision-resistance, meaning that it's hard to come up with two different inputs that have the same digest value.
... syntax const digest = crypto.subtle.digest(algorithm, data); parameters algorithm is a domstring defining the hash function to use.
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Window.prompt() - Web APIs
the window.prompt() displays a dialog with an optional message prompting the user to input some text.
... syntax result = window.prompt(message, default); parameters message optional a string of text to display to the user.
... can be omitted if there is nothing to show in the prompt window.
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Loops and iteration - JavaScript
this chapter of the javascript guide introduces the different iteration statements available to javascript.
... the statements for loops provided in javascript are: for statement do...while statement while statement labeled statement break statement continue statement for...in statement for...of statement for statement a for loop repeats until a specified condition evaluates to false.
... the javascript for loop is similar to the java and c for loop.
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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).
...this does not affect their use in replacement strings: property description $1-$9 parenthesized substring matches, if any.
... the following are now properties of regexp instances, no longer of the regexp object: property description global whether or not to test the regular expression against all possible matches in a string, or only against the first.
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Array.prototype.reduceRight() - JavaScript
indexoptional the index of the current element being processed in the array.
... arrayoptional the array reduceright() was called upon.
... initialvalueoptional value to use as accumulator to the first call of the callback.
...And 8 more matches

Date.prototype.toLocaleString() - JavaScript
the new locales and options arguments let applications specify the language whose formatting conventions should be used and customize the behavior of the function.
... in older implementations, which ignore the locales and options arguments, the locale used and the form of the string returned are entirely implementation-dependent.
... syntax dateobj.tolocalestring([locales[, options]]) parameters the locales and options arguments customize the behavior of the function and let applications specify the language whose formatting conventions should be used.
...And 8 more matches

Function.prototype.apply() - JavaScript
argsarray optional an array-like object, specifying the arguments with which func should be called, or null or undefined if no arguments should be provided to the function.
... starting with ecmascript 5 these arguments can be a generic array-like object instead of an array.
... description note: while the syntax of this function is almost identical to that of call(), the fundamental difference is that call() accepts an argument list, while apply() accepts a single array of arguments.
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Intl.NumberFormat() constructor - JavaScript
syntax new intl.numberformat([locales[, options]]) parameters locales optional a string with a bcp 47 language tag, or an array of such strings.
... options optional an object with some or all of the following properties: compactdisplay only used when notation is "compact".
...you can enable this formatting by setting the currencysign option to "accounting".
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Intl - JavaScript
the intl object is the namespace for the ecmascript internationalization api, which provides language sensitive string comparison, number formatting, and date and time formatting.
... intl.displaynames() constructor for objects that enable the consistent translation of language, region and script display names.
... locale identification and negotiation the internationalization constructors as well as several language sensitive methods of other constructors (listed under see also) use a common pattern for identifying locales and determining the one they will actually use: they all accept locales and options arguments, and negotiate the requested locale(s) against the locales they support using an algorithm specified in the options.localematcher property.
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JSON.parse() - JavaScript
the json.parse() method parses a json string, constructing the javascript value or object described by the string.
... an optional reviver function can be provided to perform a transformation on the resulting object before it is returned.
...see the json object for a description of json syntax.
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Object - JavaScript
the object class represents one of javascript's data types.
... description nearly all objects in javascript are instances of object; a typical object inherits properties (including methods) from object.prototype, although these properties may be shadowed (a.k.a.
... if the value is null or undefined, it will create and return an empty object.
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String.prototype.localeCompare() - JavaScript
the new locales and options arguments let applications specify the language whose sort order should be used and customize the behavior of the function.
... in older implementations, which ignore the locales and options arguments, the locale and sort order used are entirely implementation-dependent.
... syntax referencestr.localecompare(comparestring[, locales[, options]]) parameters comparestring the string against which the referencestr is compared.
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Statements and declarations - JavaScript
javascript applications consist of statements with an appropriate syntax.
... empty an empty statement is used to provide no statement, although the javascript syntax would expect one.
... throw throws a user-defined exception.
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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.
... once the content has been downloaded, the extension authors proceed to use eval() to decode the string content into javascript objects.
... the practice is dangerous because the decoded javascript has full chrome privileges and could perform some nasty actions.
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Intercepting Page Loads - Archive of obsolete content
« previousnext » there are several ways to detect and intercept loading of web pages and their content, be it only to realize when it happens, modify their contents, or to block them and do something else instead.
...there are better ways to intercept page loads before any content is downloaded, and before the user sees anything in the tab.
... http observers another common way of detecting and intercepting loads is using http observer topics.
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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.
... the javascript runtime used in the latest versions of mozilla projects including both firefox and thunderbird has full support for ecmascript 5.1 features.
... this article covers the features supported by different versions of mozilla's javascript runtime.
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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.
... get started prerequisites before starting this module, you should have some familiarity with the basics of html and css, and you should have also worked through our previous module, javascript first steps.
...in this article we'll explore how conditional structures work in javascript.
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mozbrowsershowmodalprompt
the mozbrowsershowmodalprompt event is fired when the content of a browser <iframe> calls the window.alert(), window.confirm(), or window.prompt() methods.
... general info specification non standard interface customevent bubbles yes cancelable yes target <iframe> default action none properties property type description target read only eventtarget the browser iframe type read only domstring the type of event.
... details the details property is an anonymous javascript object with the following properties: prompttype a domstring defining the type of the prompt.
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PR_Accept
accepts a connection on a specified socket.
... syntax #include <prio.h> prfiledesc* pr_accept( prfiledesc *fd, prnetaddr *addr, printervaltime timeout); parameters the function has the following parameters: fd a pointer to a prfiledesc object representing the rendezvous socket on which the caller is willing to accept new connections.
... timeout a value of type printervaltime specifying the time limit for completion of the accept operation.
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JS_DecompileScript
return the source code of the script or the function.
... syntax jsstring * js_decompilescript(jscontext *cx, js::handle<jsscript*> script); name type description cx jscontext * the context to use to decompile the script.
... script js::handle<jsscript*> script or function to decompile.
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JS_SetPendingException
sets the current exception being thrown within a context.
... syntax void js_setpendingexception(jscontext *cx, js::handlevalue v); name type description cx jscontext * pointer to a js context from which to derive runtime information.
... v js::handlevalue value to throw as an exception.
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SpiderMonkey: The Mozilla JavaScript runtime
spidermonkey is mozilla's javascript engine written in c and c++.
... using spidermonkey introduction to the javascript shell documentation of the command-line javascript shell, js.
... jsapi user guide this guide provides an overview of spidermonkey and describes how you can embed engine calls in your applications to make them javascript-aware.
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nsIAuthPromptCallback
netwerk/base/public/nsiauthpromptcallback.idlscriptable interface for callback methods for the asynchronous nsiauthprompt2 method.
... 1.0 66 introduced gecko 1.9 inherits from: nsisupports last changed in gecko 1.9 (firefox 3) callers must call exactly one method if nsiauthprompt2.asyncpromptauth() returns successfully.
... they must not call any method on this interface before nsiauthprompt2.asyncpromptauth() returns.
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nsICacheEntryDescriptor
netwerk/cache/nsicacheentrydescriptor.idlscriptable this interface provides a cache entry descriptor.
...g key); void markvalid(); nsiinputstream openinputstream(in unsigned long offset); nsioutputstream openoutputstream(in unsigned long offset); void setdatasize(in unsigned long size); void setexpirationtime(in pruint32 expirationtime); void setmetadataelement(in string key, in string value); void visitmetadata(in nsicachemetadatavisitor visitor); attributes attribute type description accessgranted nscacheaccessmode get the access granted to this descriptor.
... see nsicache for the definitions of the access modes and a thorough description of their corresponding meanings.
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nsILoginManagerPrompter
toolkit/components/passwordmgr/public/nsiloginmanagerprompter.idlscriptable please add a summary to this article.
... 1.0 66 introduced gecko 1.9 inherits from: nsisupports last changed in gecko 1.9 (firefox 3) implemented by: @mozilla.org/login-manager/prompter;1.
... to call this service, use: var loginmanagerprompter = components.classes["@mozilla.org/login-manager/prompter;1"] .getservice(components.interfaces.nsiloginmanagerprompter); method overview void init(in nsidomwindow awindow); void prompttochangepassword(in nsilogininfo aoldlogin, in nsilogininfo anewlogin); void prompttochangepasswordwithusernames([array, size_is(count)] in nsilogininfo logins, in pruint32 count, in nsilogininfo anewlogin); void prompttosavepassword(in nsilogininfo alogin); methods init() initialize the prompter.
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AudioParamDescriptor - Web APIs
the audioparamdescriptor dictionary of the web audio api specifies properties for an audioparam objects.
...if the underlying audioworkletprocessor has a parameterdescriptors static getter, then the returned array of objects based on this dictionary is used internally by audioworkletnode constructor to populate its parameters property accordingly.
... automationrate optional either "a-rate", or "k-rate" string which represents an automation rate of this audioparam.
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BluetoothRemoteGATTDescriptor - Web APIs
the bluetoothremotegattdescriptor interface of the web bluetooth api provides a gatt descriptor, which provides further information about a characteristic’s value.
... interface interface bluetoothremotegattdescriptor { readonly attribute bluetoothgattcharacteristic characteristic; readonly attribute uuid uuid; readonly attribute arraybuffer?
... value; promise<arraybuffer> readvalue(); promise<void> writevalue(buffersource value); }; properties bluetoothremotegattdescriptor.characteristicread only returns the bluetoothremotegattcharacteristic this descriptor belongs to.
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Crypto.getRandomValues() - Web APIs
the crypto.getrandomvalues() method lets you get cryptographically strong random values.
... the array given as the parameter is filled with random numbers (random in its cryptographic meaning).
...the pseudo-random number generator algorithm (prng) may vary across user agents, but is suitable for cryptographic purposes.
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Element.setPointerCapture() - Web APIs
the setpointercapture() method of the element interface is used to designate a specific element as the capture target of future pointer events.
... subsequent events for the pointer will be targeted at the capture element until capture is released (via element.releasepointercapture()).
... note: when pointer capture is set, pointerover, pointerout, pointerenter, and pointerleave events are only generated when crossing the boundary of the capture target.
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NodeFilter.acceptNode() - Web APIs
the nodefilter.acceptnode() method returns an unsigned short that will be used to tell if a given node must be accepted or not by the nodeiterator or treewalker iteration algorithm.
...possible return values are: constant description nodefilter.filter_accept value returned by the nodefilter.acceptnode() method when a node should be accepted.
... nodefilter.filter_reject value to be returned by the nodefilter.acceptnode() method when a node should be rejected.
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PaymentRequest.onshippingoptionchange - Web APIs
the onshippingoptionchange event of the paymentrequest interface is fired whenever the user changes a shipping option.
... syntax paymentrequest.addeventlistener('shippingoptionchange', shippingoptionchangeevent => { ...
... }); paymentrequest.onshippingoptionchange = function(shippingoptionchangeevent) { ...
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RTCRtpTransceiver.direction - Web APIs
the rtcrtptransceiver property direction is a string which indicates the transceiver's preferred directionality.
... its value must be one of the strings defined by the rtcrtptransceiverdirection enumeration.
... syntax var direction = rtcrtptransceiver.direction value a domstring whose value is one of the strings which are a member of the rtcrtptransceiverdirection enumerated type, indicating the transceiver's preferred direction.
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RTCRtpTransceiver - Web APIs
the webrtc interface rtcrtptransceiver describes a permanent pairing of an rtcrtpsender and an rtcrtpreceiver, along with some shared state.
... each sdp media section describes one bidirectional srtp ("secure real time protocol") stream (excepting the media section for rtcdatachannel, if present).
... this pairing of send and receive srtp streams is significant for some applications, so rtcrtptransceiver is used to represent this pairing, along with other important state from the media section.
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ScriptProcessorNode - Web APIs
the scriptprocessornode interface allows the generation, processing, or analyzing of audio using javascript.
... the scriptprocessornode interface is an audionode audio-processing module that is linked to two buffers, one containing the input audio data, one containing the processed output audio data.
... the size of the input and output buffer are defined at the creation time, when the audiocontext.createscriptprocessor() method is called (both are defined by audiocontext.createscriptprocessor()'s buffersize parameter).
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Improving compatibility using WebRTC adapter.js - Web APIs
the webrtc organization provides on github the webrtc adapter to work around compatibility issues in different browsers' webrtc implementations.
... the adapter is a javascript shim which lets your code to be written to the specification so that it will "just work" in all browsers with webrtc support.
... note: since there is ongoing fluidity in functionality and naming of api terms in webrtc and supporting browsers, use of this adapter is generally recommended.
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font-optical-sizing - CSS: Cascading Style Sheets
the font-optical-sizing css property sets whether text rendering is optimized for viewing at different sizes.
... syntax /* keyword values */ font-optical-sizing: none; font-optical-sizing: auto; /* default */ /* global values */ font-optical-sizing: inherit; font-optical-sizing: initial; font-optical-sizing: unset; values none the browser will not modify the shape of glyphs for optimal viewing.
... auto the browser will modify the shape of glyphs for optimal viewing.
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Text formatting - JavaScript
« previousnext » this chapter introduces how to work with strings and text in javascript.
... strings javascript's string type is used to represent textual data.
... '\u00a9' // "©" unicode code point escapes new in ecmascript 2015.
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arguments.callee - JavaScript
description callee is a property of the arguments object.
... warning: the 5th edition of ecmascript (es5) forbids use of arguments.callee() in strict mode.
... (adapted from a stack overflow answer by olliej) early versions of javascript did not allow named function expressions, and for this reason you could not make a recursive function expression.
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Array.prototype.every() - JavaScript
index optional the index of the current element being processed in the array.
... array optional the array every was called upon.
... thisarg optional a value to use as this when executing callback.
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Array.from() - JavaScript
mapfn optional map function to call on every element of the array.
... thisarg optional value to use as this when executing mapfn.
... description array.from() lets you create arrays from: array-like objects (objects with a length property and indexed elements); or iterable objects (objects such as map and set).
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Date.UTC() - JavaScript
the date.utc() method accepts parameters similar to the date constructor, but treats them as utc.
... syntax since ecmascript 2017: date.utc(year[, month[, day[, hour[, minute[, second[, millisecond]]]]]]) ecmascript 2016 and earlier: (month used to be required) date.utc(year, month[, day[, hour[, minute[, second[, millisecond]]]]]) parameters year a full year.
...(up through ecmascript 2016, month was a required parameter.
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Date.prototype.toLocaleDateString() - JavaScript
the new locales and options arguments let applications specify the language whose formatting conventions should be used and allow to customize the behavior of the function.
... in older implementations, which ignore the locales and options arguments, the locale used and the form of the string returned are entirely implementation dependent.
... syntax dateobj.tolocaledatestring([locales [, options]]) parameters the locales and options arguments customize the behavior of the function and let applications specify the language whose formatting conventions should be used.
...And 7 more matches

Date.prototype.toLocaleTimeString() - JavaScript
the new locales and options arguments let applications specify the language whose formatting conventions should be used and customize the behavior of the function.
... in older implementations, which ignore the locales and options arguments, the locale used and the form of the string returned are entirely implementation dependent.
... syntax dateobj.tolocaletimestring([locales[, options]]) parameters the locales and options arguments customize the behavior of the function and let applications specify the language whose formatting conventions should be used.
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Function.name - JavaScript
a function object's read-only name property indicates the function's name as specified when it was created, or it may be rather anonymous or ''(an empty string) for functions created anonymously.
... javascript compressors and minifiers warning: be careful when using function.name and source code transformations, such as those carried out by javascript compressors (minifiers) or obfuscators.
... these tools are often used as part of a javascript build pipeline to reduce the size of a program prior to deploying it to production.
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Object.defineProperties() - JavaScript
each value in props must be either a data descriptor or an accessor descriptor; it cannot be both (see object.defineproperty() for more details).
... data descriptors and accessor descriptors may optionally contain the following keys: configurable true if and only if the type of this property descriptor may be changed and if the property may be deleted from the corresponding object.
... a data descriptor also has the following optional keys: value the value associated with the property.
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Proxy - JavaScript
the proxy object enables you to create a proxy for another object, which can intercept and redefine fundamental operations for that object.
... description a proxy is created with two parameters: target: the original object which you want to proxy handler: an object that defines which operations will be intercepted and how to redefine intercepted operations.
... for example, this code defines a simple target with just two properties, and an even simpler handler with no properties: const target = { message1: "hello", message2: "everyone" }; const handler1 = {}; const proxy1 = new proxy(target, handler1); because the handler is empty, this proxy behaves just like the original target: console.log(proxy1.message1); // hello console.log(proxy1.message2); // everyone to customise the proxy, we define functions on the handler object: const target = { message1: "hello", message2: "everyone" }; const handler2 = { get: function(target, prop, receiver) { return "world"; } }; const proxy2 = new proxy(target, handler2); here we've provided an implementation of the get() handler, which intercepts attempts to access properties in the...
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RegExp - JavaScript
for an introduction to regular expressions, read the regular expressions chapter in the javascript guide.
... description literal notation and constructor there are two ways to create a regexp object: a literal notation and a constructor.
... flags in constructor starting with ecmascript 6, new regexp(/ab+c/, 'i') no longer throws a typeerror ("can't supply flags when constructing one regexp from another") when the first argument is a regexp and the second flags argument is present.
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String.prototype.replace() - JavaScript
description this method does not change the calling string object.
... $<name> where name is a capturing group name.
... if the group is not in the regular expressions (or not in the match), this will resolve to the empty string.
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String - JavaScript
description strings are useful for holding data that can be represented in text form.
...the first is the charat() method: return 'cat'.charat(1) // returns "a" the other way (introduced in ecmascript 5) is to treat the string as an array-like object, where individual characters 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.
...in javascript, you just use the less-than and greater-than operators: let a = 'a' let b = 'b' if (a < b) { // true console.log(a + ' is less than ' + b) } else if (a > b) { console.log(a + ' is greater than ' + b) } else { console.log(a + ' and ' + b + ' are equal.') } a similar result can be achieved using the localecompare() method inherited by string instances.
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isNaN() - JavaScript
note, coercion inside the isnan function has interesting rules; you may alternatively want to use number.isnan(), as defined in ecmascript 2015.
... description the necessity of an isnan function unlike all other possible values in javascript, it is not possible to rely on the equality operators (== and ===) to determine whether a value is nan or not, because both nan == nan and nan === nan evaluate to false.
...a nan also results from attempted coercion to numeric values of non-numeric values for which no primitive numeric value is available.
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typeof - JavaScript
description the following table summarizes the possible return values of typeof.
... for more information about types and primitives, see also the javascript data structure page.
... type result undefined "undefined" null "object" (see below) boolean "boolean" number "number" bigint (new in ecmascript 2020) "bigint" string "string" symbol (new in ecmascript 2015) "symbol" function object (implements [[call]] in ecma-262 terms) "function" any other object "object" note: ecmascript 2019 and older permitted implementations to have typeof return any implementation-defined string value for non-callable non-standard exotic objects.
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var - JavaScript
the var statement declares a function-scoped or globally-scoped variable, optionally initializing it to a value.
... valuen optional initial value of the variable.
... description var declarations, wherever they occur, are processed before any code is executed.
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<mmultiscripts> - MathML
the mathml <mmultiscripts> element allows you to create tensor-like objects.
... in a descriptive way tensors are multidimensional matrices (mathematical imprecise but exemplified).
... mathml uses a special syntax to describe subscripts and superscripts for both, postscripts and prescripts, attached to a base expression: <mmultiscripts> base (subscript superscript)* [ <mprescripts/> (presubscript presuperscript)* ] </mmultiscripts> after the base expression you can specify a postsubscript and a postsuperscript.
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Optimizing startup performance - Web Performance
an often overlooked aspect of app software development—even among those focusing on performance optimization—is startup performance.
...if the app is being run in a browser, it's possible the user may get an "unresponsive app" or "slow script" notification.
... while you can use web workers to run even very large, long-duration chunks of javascript code asynchronously, there's a huge caveat that: workers don't have access to webgl or audio, and they can't send synchronous messages to the main thread, so you can't even proxy those apis to the main thread.
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Cross-domain Content Scripts - Archive of obsolete content
by default, content scripts don't have any cross-domain privileges.
...them to your add-on's package.json under the "cross-domain-content" key, which itself lives under the "permissions" key: "permissions": { "cross-domain-content": ["http://example.org/", "http://example.com/"] } the domains listed must include the scheme and fully qualified domain name, and these must exactly match the domains serving the content - so in the example above, the content script will not be allowed to access content served from https://example.com/.
... this feature is currently only available for content scripts, not for page scripts included in html files shipped with your add-on.
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JavaScript Debugger Service - Archive of obsolete content
in firefox versions prior to gecko 33 (firefox 33 / thunderbird 33 / seamonkey 2.30), the javascript debugger service (or simply jsd) used to be an xpcom component that allows the tracking of javascript while it was being executed in the browser.
... jsd.scripthook = { onscriptcreated: function(script) { // your function here }, onscriptdestroyed: function(script) { // your function here } }; jsd.errorhook = { onerror: function(message, filename, lineno, colno, flags, errnum, exc) { // your function here } }; // triggered when jsd.errorhook[onerror] returns false jsd.debughook = { onexecute: function(frame, type, rv) { // your functio...
...n 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.
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Label and description - Archive of obsolete content
line breaking under normal conditions, a description will not break long-running text and the text may be cropped or hidden.
... to cause the text to wrap: ensure the long-running text is a text node child of <description/> or <label/> (i.e., do not specify the long-running text in the value attribute of these elements).
... <description>i am your father's brother's nephew's cousin's former roommate.
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script - Archive of obsolete content
« xul reference home [ examples | attributes | properties | methods | related ] much like the html script element, this is used to declare a script to be used by the xul window.
... you should usually put scripts in a separate file pointed to by the src attribute, but you may also place the script inline inside the opening and closing script tags.
... attributes src, type examples <script src="test.js"/> <script src="http://example.com/js/test.js"/> <script> function foo(){ // code } </script> attributes src type: uri the uri of the script.
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New in JavaScript 1.1 - Archive of obsolete content
the following is a changelog for javascript from netscape navigator 2.0 to 3.0.
...netscape navigator 3.0 was the second major version of the browser with javascript support.
... javascript versions netscape navigator 3.0 also introduced javascript language versions.
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New in JavaScript 1.2 - Archive of obsolete content
the following is a changelog for javascript from netscape navigator 3.0 to 4.0.
...netscape navigator 4.0 was the third major version of the browser with javascript support.
... javascript versions netscape navigator 4.0 executes javascript language versions up to 1.2.
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New in JavaScript 1.8 - Archive of obsolete content
the following is a changelog for javascript 1.8.
...see bug 380236 for a tracking development bug for javascript 1.8.
... using javascript 1.8 in order to use some of the new features of javascript 1.8 in html, use: <script type="application/javascript;version=1.8"> ...
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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.
... this property has been removed and no longer works.array comprehensionsthe array comprehension syntax was a javascript expression which allowed you to quickly assemble a new array based on an existing one.
...it's equivalent to object.observe() invoked with the accept type list ["add", "update", "delete", "splice"].
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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.
... get started prerequisites asynchronous javascript is a fairly advanced topic, and you are advised to work through javascript first steps and javascript building blocks modules before attempting this.
... if you are not familiar with the concept of asynchronous programming, you should definitely start with the general asynchronous programming concepts article in this module.
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Limitations of frame scripts
frame scripts run with system privileges and have access to the components object, enabling them to use xpcom objects and jsms.
...however, some apis that work in the chrome process will not work in a frame script.
... file i/o you should not write to or read from the disk from a frame script, in particular, the profile directory.
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HTMLIFrameElement.executeScript()
the executescript() method of the htmliframeelement interface allows a specified script to be executed against a page loaded in the browser <iframe>.
... syntax var mydomrequest = instanceofhtmliframeelement.executescript(script, options); return value a domrequest object that returns an onsuccess handler if the script is successfully executed against the loaded content, or an onerror handler if not.
... parameters script the script to be executed.
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FC_EncryptUpdate
name fc_encryptupdate - encrypt a block of a multi-part encryption operation.
... syntax ck_rv fc_encryptupdate( ck_session_handle hsession, ck_byte_ptr ppart, ck_ulong uspartlen, ck_byte_ptr pencryptedpart, ck_ulong_ptr pusencryptedpartlen ); parameters hsession [in] session handle.
... ppart [in] pointer to the next block of data to be encrypted.
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AudioWorkletNodeOptions - Web APIs
the audioworkletnodeoptions dictionary of the web audio api is used to specify configuration options when constructing a new audioworkletnode object for custom audio processing.
...during internal instantiation of the underlying audioworkletprocessor, the the structured clone algorithm is applied to the options object and the result is passed into audioworkletprocessor's constructor.
... properties numberofinputs optional the value to initialize the numberofinputs property to.
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Crypto - Web APIs
the crypto interface represents basic cryptography features available in the current context.
... it allows access to a cryptographically strong random number generator and to cryptographic primitives.
... the web crypto api is accessed through the window.crypto property, which is a crypto object.
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CryptoKeyPair - Web APIs
the cryptokeypair dictionary of the web crypto api represents a key pair for an asymmetric cryptography algorithm, also known as a public-key algorithm.
... a cryptokeypair object can be obtained using subtlecrypto.generatekey(), when the selected algorithm is one of the asymmetric algorithms: rsassa-pkcs1-v1_5, rsa-pss, rsa-oaep, ecdsa, or ecdh.
... it contains two properties, which are both cryptokey objects: a privatekey property containing the private key and a publickey property containing the public key.
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PushManager.getSubscription() - Web APIs
the pushmanager.getsubscription() method of the pushmanager interface retrieves an existing push subscription.
... it returns a promise that resolves to a pushsubscription object containing details of an existing subscription.
... if no existing subscription exists, this resolves to a null value.
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PushSubscription - Web APIs
the pushsubscription interface of the push api provides a subcription's url endpoint and allows unsubscription from a push service.
... properties pushsubscription.endpoint read only a usvstring containing the endpoint associated with the push subscription.
... pushsubscription.expirationtime read only a domhighrestimestamp of the subscription expiration time associated with the push subscription, if there is one, or null otherwise.
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Streams API concepts - Web APIs
the streams api adds a very useful set of tools to the web platform, providing objects allowing javascript to programmatically access streams of data received over the network and process them as desired by the developer.
... some of the concepts and terminology associated with streams might be new to you — this article explains all you need to know.
... readable streams a readable stream is a data source represented in javascript by a readablestream object that flows from an underlying source — this is a resource somewhere on the network or elsewhere on your domain that you want to get data from.
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SubtleCrypto.verify() - Web APIs
the verify() method of the subtlecrypto interface verifies a digital signature.
... syntax const result = crypto.subtle.verify(algorithm, key, signature, data); parameters algorithm is a domstring or object defining the algorithm to use, and for some algorithm choices, some extra parameters.
... key is a cryptokey containing the key that will be used to verify the signature.
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scripting - CSS: Cascading Style Sheets
the scripting css media feature can be used to test whether scripting (such as javascript) is available.
... syntax the scripting feature is specified as a keyword value chosen from the list below.
... none scripting is completely unavailable on the current document.
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<noscript> - HTML: Hypertext Markup Language
the html <noscript> element defines a section of html to be inserted if a script type on the page is unsupported or if scripting is currently turned off in the browser.
... permitted content when scripting is disabled and when it is a descendant of the <head> element: in any order, zero or more <link> elements, zero or more <style> elements, and zero or more <meta> elements.
... when scripting is disabled and when it isn't a descendant of the <head> element: any transparent content, but no <noscript> element must be among its descendants.
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<optgroup> - HTML: Hypertext Markup Language
the html <optgroup> element creates a grouping of options within a <select> element.
... permitted content zero or more <option> elements.
...the end tag is optional if this element is immediately followed by another <optgroup> element, or if the parent element has no more content.
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Iterators and generators - JavaScript
javascript provides a number of ways of iterating over a collection, from simple for loops to map() and filter().
... iterators and generators bring the concept of iteration directly into the core language and provide a mechanism for customizing the behavior of for...of loops.
... for details, see also: iteration_protocols for...of function* and generator yield and yield* iterators in javascript an iterator is an object which defines a sequence and potentially a return value upon its termination.
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Array.prototype.forEach() - JavaScript
it accepts between one and three arguments: currentvalue the current element being processed in the array.
... index optional the index currentvalue in the array.
... array optional the array foreach() was called upon.
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Date() constructor - JavaScript
creates a javascript date instance that represents a single moment in time in a platform-independent format.
... time value or timestamp number value an integer value representing the number of milliseconds since january 1, 1970, 00:00:00 utc (the ecmascript epoch, equivalent to the unix epoch), with leap seconds ignored.
... day optional integer value representing the day of the month.
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Date - JavaScript
javascript date objects represent a single moment in time in a platform-independent format.
... description the ecmascript epoch and timestamps a javascript date is fundamentally specified as the number of milliseconds that have elapsed since midnight on january 1, 1970, utc.
...instead, it is defined in ecma-262 that a maximum of ±100,000,000 (one hundred million) days relative to january 1, 1970 utc (that is, april 20, 271821 bce ~ september 13, 275760 ce) can be represented by the standard date object (equivalent to ±8,640,000,000,000,000 milliseconds).
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FinalizationRegistry - JavaScript
description finalizationregistry provides a way to request that a cleanup callback get called at some point when an object registered with the registry has been reclaimed (garbage-collected).
...when, how, and whether garbage collection occurs is down to the implementation of any given javascript engine.
...garbage collection is a hard problem that javascript engine implementers are constantly refining and improving their solutions to.
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Intl.Collator() constructor - JavaScript
syntax new intl.collator([locales[, options]]) parameters locales optional.
...the "standard" and "search" values are ignored; they are replaced by the options property usage (see below).
...this option can be set through an options property or through a unicode extension key; if both are provided, the options property takes precedence.
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Intl.DateTimeFormat() constructor - JavaScript
syntax new intl.datetimeformat([locales[, options]]) parameters locales optional a string with a bcp 47 language tag, or an array of such strings.
...possible values include: "buddhist", "chinese", "coptic", "ethiopia", "ethiopic", "gregory", "hebrew", "indian", "islamic", "iso8601", "japanese", "persian", "roc".
... options optional an object with some or all of the following properties: datestyle the date formatting style to use when calling format().
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Intl.Locale - JavaScript
description the intl.locale object was created to allow for easier manipulation of unicode locales.
...language identifiers are the core of the locale, consisting of language, script, and region subtags.
... additional information about the locale is stored in the optional extension tags.
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Number.prototype.toLocaleString() - JavaScript
syntax numobj.tolocalestring([locales [, options]]) parameters the locales and options arguments customize the behavior of the function and let applications specify the language whose formatting conventions should be used.
... in implementations, which ignore the locales and options arguments, the locale used and the form of the string returned are entirely implementation dependent.
... examples using tolocalestring in basic use without specifying a locale, a formatted string in the default locale and with default options is returned.
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Number - JavaScript
the javascript number type is a double-precision 64-bit binary format ieee 754 value, like double in java or c#.
... a number literal like 37 in javascript code is a floating-point value, not an integer.
...(javascript now has a bigint type, but it was not designed to replace number for everyday uses.
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Object.create() - JavaScript
propertiesobject optional if specified and not undefined, an object whose enumerable own properties (that is, those properties defined upon itself and not enumerable properties along its prototype chain) specify property descriptors to be added to the newly-created object, with the corresponding property names.
... exceptions the proto parameter has to be either null or an object excluding primitive wrapper objects.
...however, when attempting to actually use these objects, their differences quickly become apparent: > "oco is: " + oco // shows "oco is: [object object]" > "ocn is: " + ocn // throws error: cannot convert object to primitive value testing just a few of the many most basic built-in functions shows the magnitude of the problem more clearly: > alert(oco) // shows [object object] > alert(ocn) // throws error: cannot c...
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Promise.all() - JavaScript
return value an already resolved promise if the iterable passed is empty.
...this returned promise is then resolved/rejected asynchronously (as soon as the stack is empty) when all the promises in the given iterable have resolved, or if any of the promises reject.
... description this method can be useful for aggregating the results of multiple promises.
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handler.defineProperty() - JavaScript
syntax const p = new proxy(target, { defineproperty: function(target, property, descriptor) { } }); parameters the following parameters are passed to the defineproperty() method.
... property the name or symbol of the property whose description is to be retrieved.
... descriptor the descriptor for the property being defined or modified.
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WeakRef - JavaScript
description a weakref object contains a weak reference to an object, which is called its target or referent.
...when an object no longer has any strong references to it, the javascript engine's garbage collector may destroy the object and reclaim its memory.
...when, how, and whether garbage collection occurs is down to the implementation of any given javascript engine.
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with - JavaScript
see the "ambiguity contra" paragraph in the "description" section below for details.
... description javascript looks up an unqualified name by searching a scope chain associated with the execution context of the script or function containing that unqualified name.
... using with is not recommended, and is forbidden in ecmascript 5 strict mode.
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mimeTypes.rdf corruption - SVG: Scalable Vector Graphics
symptoms previously you were able to open and display svg content with mozilla, but for no apparent reason its behaviour changes and now it always pops up the "open or save file" dialog when you try to open local svg files, and displays the "additional plugins are required to display all the media on this page" bar when you try to view html with embedded svg.
...if the blue square with the white cross displays when you load this scripting across embed demo, then you are not experiencing this problem.
... possible solutions how you solve this problem depends on whether it's your operating system or your mozilla profile (mimetypes.rdf) that are corrupt.
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JavaScript timers - Archive of obsolete content
a block of javascript code is generally executed synchronously.
... but there are some javascript native functions (timers) which allow us to delay the execution of arbitrary instructions: settimeout() setinterval() setimmediate() requestanimationframe() the settimeout() function is commonly used if you wish to have your function called once after the specified delay.
... using javascript timers within animations (javascript daemons management) 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.
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Error.description - Archive of obsolete content
the error.description property returns or sets the descriptive string associated with a specific error.
... syntax object .description [= stringexpression] parameters object required.
... stringexpression optional.
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Public-key cryptography - MDN Web Docs Glossary: Definitions of Web-related terms
public-key cryptography — or asymmetric cryptography — is a cryptographic system in which keys come in pairs.
...one key (the private key) is kept secret while the other is made public.
... when used for encryption, the public key is used to encrypt and the private key is used to decrypt.
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Localizing extension descriptions
this article provides details on how to go about localizing the descriptions of mozilla add-ons, as well as for other metadata about your add-on.
... localizing in gecko 1.9 gecko 1.9 includes a new, more robust method for localizing add-on descriptions and other metadata.
... all of the different descriptions now appear in the install.rdf file using em:localized properties.
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Cryptography functions
the public functions listed here perform cryptographic operations based on the pkcs #11 interface.
... pk11_destroytokenobject mxr 3.2 and later pk11_digestbegin mxr 3.2 and later pk11_digestkey mxr 3.2 and later pk11_digestop mxr 3.2 and later pk11_digestfinal mxr 3.2 and later pk11_doesmechanism mxr 3.2 and later pk11_exportencryptedprivatekeyinfo mxr 3.2 and later pk11_exportencryptedprivkeyinfo mxr 3.9 and later pk11_exportprivatekeyinfo mxr 3.2 and later pk11_finalize mxr 3.2 and later pk11_findbestkeamatch mxr 3.2 and later pk11_findcertandkeybyrecipientlist mxr 3.2 and ...
...tmodule mxr 3.3 and later pk11_getmoduleid mxr 3.2 and later pk11_getnextgenericobject mxr 3.9.2 and later pk11_getnextsafe mxr 3.4 and later pk11_getnextsymkey mxr 3.4 and later pk11_getpadmechanism mxr 3.4 and later pk11_getpbecryptomechanism mxr 3.12 and later pk11_getpbeiv mxr 3.6 and later pk11_getpqgparamsfromprivatekey mxr 3.4 and later pk11_getprevgenericobject mxr 3.9.2 and later pk11_getprivatekeynickname mxr 3.4 and later pk11_getprivatemoduluslen mxr 3.2 and later ...
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FC_DecryptDigestUpdate
name fc_decryptdigestupdate - continue a multi-part decrypt and digest operation syntax ck_rv fc_decryptdigestupdate( ck_session_handle hsession, ck_byte_ptr pencryptedpart, ck_ulong ulencryptedpartlen, ck_byte_ptr ppart, ck_ulong_ptr pulpartlen ); parameters hsession [in] session handle.
... pencryptedpart [in] pointer to the encrypted data part.
... ulencryptedpartlen [in] length of encrypted data in bytes.
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FC_DecryptUpdate
name fc_decryptupdate - decrypt a block of a multi-part encryption operation.
... syntax ck_rv fc_decryptupdate( ck_session_handle hsession, ck_byte_ptr pencryptedpart, ck_ulong usencryptedpartlen, ck_byte_ptr ppart, ck_ulong_ptr puspartlen ); parameters hsession [in] session handle.
... pencryptedpart [in] pointer to the next block of data to be decrypted.
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FC_DecryptVerifyUpdate
name fc_decryptverifyupdate - continue a multi-part decrypt and verify operation syntax ck_rv fc_decryptverifyupdate( ck_session_handle hsession, ck_byte_ptr pencrypteddata, ck_ulong ulencrypteddatalen, ck_byte_ptr pdata, ck_ulong_ptr puldatalen ); parameters hsession [in] session handle.
... pencrypteddata [in] pointer to the encrypted data part.
... ulencrypteddatalen [in] length of encrypted data in bytes.
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FC_DigestEncryptUpdate
name fc_digestencryptupdate - continue a multi-part digest and encryption operation syntax ck_rv fc_digestencryptupdate( ck_session_handle hsession, ck_byte_ptr ppart, ck_ulong ulpartlen, ck_byte_ptr pencryptedpart, ck_ulong_ptr pulencryptedpartlen ); parameters hsession [in] session handle.
...pencryptedpart [in] pointer to the location which receives the digested and encrypted part or null.
... pulencryptedpartlen [in] pointer to the length of the encrypted part buffer.
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FC_SignEncryptUpdate
name fc_signencryptupdate - continue a multi-part signing and encryption operation syntax ck_rv fc_signencryptupdate( ck_session_handle hsession, ck_byte_ptr ppart, ck_ulong ulpartlen, ck_byte_ptr pencryptedpart, ck_ulong_ptr pulencryptedpartlen ); parameters hsession [in] session handle.
...pencryptedpart [in] pointer to the location which receives the signed and encrypted data part or null.
... pulencryptedpartlen [in] pointer to the length of the encrypted part buffer.
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JS_ClearPendingException
clear the currently pending exception in a context.
... syntax void js_clearpendingexception(jscontext *cx); name type description cx jscontext * the context in which the exception was thrown.
... description js_clearpendingexception cancels the currently pending exception in cx, if any.
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JS_DestroyScript
free a compiled script that is no longer needed.
... syntax void js_destroyscript(jscontext *cx, jsscript *script); name type description cx jscontext * the context in which to destroy the script.
... script jsscript * the script to destroy.
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JS_ReportPendingException
forward the current pending exception in a given jscontext to the current jserrorreporter callback.
... syntax bool js_reportpendingexception(jscontext *cx); name type description cx jscontext * the context in which the exception was thrown.
... description if an exception is pending in the context cx, js_reportpendingexception converts the exception to a string and reports it to the current error reporter.
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JS_SaveExceptionState
saves the exception state from the specified context.
... syntax jsexceptionstate * js_saveexceptionstate(jscontext *cx); name type description cx jscontext * pointer to a js context from which to derive runtime information.
... description saves the current exception state (that is, any pending exception, or a cleared exception state) associated with the specified context cx, and returns a jsexceptionstate object holding this state.
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nsIAuthPromptProvider
netwerk/base/public/nsiauthpromptprovider.idlscriptable this interface requests a prompt interface for the given prompt reason.
... inherits from: nsisupports last changed in gecko 1.9 (firefox 3) method overview void getauthprompt(in pruint32 apromptreason, in nsiidref iid, [iid_is(iid),retval] out nsqiresult result); constants constant value description prompt_normal 0 normal (non-proxy) prompt request.
... prompt_proxy 1 proxy authentication request.
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nsIPrompt
netwerk/base/public/nsiprompt.idlscriptable this is the prompt interface which can be used without knowledge of a parent window.
... inherits from: nsisupports last changed in gecko 1.8 (firefox 1.5 / thunderbird 1.5 / seamonkey 1.0) note: this interface is identical to nsipromptservice but without the parent nsidomwindow parameter.
... to avoid redundancy, all methods here link to nsipromptservice.
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nsIScriptError2
js/src/xpconnect/idl/nsiscripterror.idlscriptable represents javascript errors and warnings for use by the console service; augments nsiscripterror by adding a way to initialize the error with the window id of the outer window with which the error is associated.
... 1.0 66 introduced gecko 2.0 obsolete gecko 12.0 inherits from: nsiscripterror last changed in gecko 9.0 (firefox 9.0 / thunderbird 9.0 / seamonkey 2.6) in gecko 12.0 this interface was merged into the nsiscripterror interface.
... method overview void initwithwindowid(in wstring message, in wstring sourcename, in wstring sourceline, in pruint32 linenumber, in pruint32 columnnumber, in pruint32 flags, in string category, in unsigned long long innerwindowid); attributes attribute type description innerwindowid unsigned long long the inner window id with which the error is associated.
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AudioContextOptions - Web APIs
the audiocontextoptions dictionary is used to specify configuration options when constructing a new audiocontext object to represent a graph of web audio nodes.
... properties latencyhint optional the type of playback that the context will be used for, as a value from the audiocontextlatencycategory enum or a double-precision floating-point value indicating the preferred maximum latency of the context in seconds.
... samplerate optional the samplerate to be used by the audiocontext, specified in samples per second.
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BaseAudioContext.createScriptProcessor() - Web APIs
the createscriptprocessor() method of the baseaudiocontext interface creates a scriptprocessornode used for direct audio processing.
... syntax var scriptprocessor = audioctx.createscriptprocessor(buffersize, numberofinputchannels, numberofoutputchannels); parameters buffersize the buffer size in units of sample-frames.
... returns a scriptprocessornode.
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DOMException() - Web APIs
the domexception() constructor returns a domexception object with a specified message and name.
... syntax var domexception = new domexception(); var domexception = new domexception(message); var domexception = new domexception(message, name); parameters message optional a description of the exception.
... if not present, the empty string '' is used.
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Element.releasePointerCapture() - Web APIs
the releasepointercapture() method of the element interface releases (stops) pointer capture that was previously set for a specific (pointerevent) pointer.
... see the element.setpointercapture() method for a description of pointer capture and how to set it for a particular element.
... syntax targetelement.releasepointercapture(pointerid); parameters pointerid the pointerid of a pointerevent object.
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HTMLMediaElement: emptied event - Web APIs
the emptied event is fired when the media has become empty; for example, this event is sent if the media has already been loaded (or partially loaded), and the load() method is called to reload it.
... bubbles no cancelable no interface event target element default action none event handler property globaleventhandlers.onemptied specification html5 media examples these examples add an event listener for the htmlmediaelement's emptied event, then post a message when that event handler has reacted to the event firing.
... using addeventlistener(): const video = document.queryselector('video'); video.addeventlistener('emptied', (event) => { console.log('uh oh.
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HTMLOptGroupElement - Web APIs
the htmloptgroupelement interface provides special properties and methods (beyond the regular htmlelement object interface they also have available to them by inheritance) for manipulating the layout and presentation of <optgroup> elements.
...co,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">htmlelement</text></a><polyline points="491,25 501,20 501,30 491,25" stroke="#d4dde4" fill="none"/><line x1="501" y1="25" x2="509" y2="25" stroke="#d4dde4"/><line x1="509" y1="25" x2="509" y2="90" stroke="#d4dde4"/><line x1="509" y1="90" x2="492" y2="90" stroke="#d4dde4"/><a xlink:href="/docs/web/api/htmloptgroupelement" target="_top"><rect x="301" y="65" width="190" height="50" fill="#f4f7f8" stroke="#d4dde4" stroke-width="2px" /><text x="396" y="94" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">htmloptgroupelement</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties in...
... htmloptgroupelement.disabled is a boolean representing whether or not the whole list of children <option> is disabled (true) or not (false).
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IDBDatabaseException - Web APIs
obsolete: this interface was removed from the specification and was replaced by usage of domexception.
... in the indexeddb api, an idbdatabaseexception object represents exception conditions that can be encountered while performing database operations.
... attributes attribute type description code unsigned short the most appropriate error code for the condition.
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PaymentRequest.shippingOption - Web APIs
the shippingoption read-only attribute of the paymentrequest interface returns either the id of a selected shipping option, null (if no shipping option was set to be selected) or a shipping option selected by the user.
... it is initially null by when no "selected" shipping options are provided.
...if requestshipping was false (or missing), shippingoption returns null, even the developer provides a selected a shipping option.
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PaymentResponse.shippingOption - Web APIs
the shippingoption read-only property of the paymentrequest interface returns the id attribute of the shipping option selected by the user.
... this option is only present when the requestshipping option is set to true in the paymentoptions object passed to the paymentrequest constructor.
... syntax var shippingoption = paymentrequest.shippingoption; example in the example below, the paymentrequest.onshippingaoptionchange event is called.
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PublicKeyCredentialCreationOptions.extensions - Web APIs
extensions, an optional property of the publickeycredentialcreationoptions dictionary, is an object providing the client extensions and their input values.
... note: an analogous option exists for the fetching operation (navigators.credentials.get()), see publickeycredentialrequestoptions.extensions.
... syntax extensions = publickeycredentialcreationoptions.extensions value an object with various keys and values.
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PublicKeyCredentialRequestOptions.extensions - Web APIs
extensions, an optional property of the publickeycredentialrequestoptions dictionary, is an object providing the client extensions and their input values.
... note: an analogous option exists for the creation operation (navigators.credentials.create()), see publickeycredentialcreationoptions.extensions.
... syntax extensions = publickeycredentialrequestoptions.extensions value an object with various keys and values.
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RTCPeerConnection.currentLocalDescription - Web APIs
the read-only property rtcpeerconnection.currentlocaldescription returns an rtcsessiondescription object describing the local end of the connection as it was most recently successfully negotiated since the last time the rtcpeerconnection finished negotiating and connecting to a remote peer.
... also included is a list of any ice candidates that may already have been generated by the ice agent since the offer or answer represented by the description was first instantiated.
... to change the currentlocaldescription, call rtcpeerconnection.setlocaldescription(), which triggers a series of events which leads to this value being set.
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RTCPeerConnection.currentRemoteDescription - Web APIs
the read-only property rtcpeerconnection.currentremotedescription returns an rtcsessiondescription object describing the remote end of the connection as it was most recently successfully negotiated since the last time the rtcpeerconnection finished negotiating and connecting to a remote peer.
... also included is a list of any ice candidates that may already have been generated by the ice agent since the offer or answer represented by the description was first instantiated.
... to change the currentremotedescription, call rtcpeerconnection.setremotedescription(), which triggers a series of events which leads to this value being set.
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RTCRtpTransceiver.currentDirection - Web APIs
the read-only rtcrtptransceiver property currentdirection is a string which indicates the current directionality of the transceiver.
... its value is one of the strings defined by the rtcrtptransceiverdirection enumeration.
... syntax var direction = rtcrtptransceiver.currentdirection value a domstring whose value is one of the strings which are a member of the rtcrtptransceiverdirection enumerated type.
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RTCSctpTransport - Web APIs
the rtcsctptransport interface provides information which describes a stream control transmission protocol (sctp) transport.
... you don't create rtcsctptransport objects yourself; instead, you get access to the rtcsctptransport for a given rtcpeerconnection through its sctp property.
... properties also inherits properties from: eventtarget rtcsctptransport.maxchannelsread only an integer value indicating the maximum number of rtcdatachannels that can be open simultaneously.
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ScrollToOptions - Web APIs
the scrolltooptions dictionary of the cssom view spec contains properties specifying where an element should be scrolled to, and whether the scrolling should be smooth.
... a scrolltooptions dictionary can be provided as a parameter for the following methods: window.scroll() window.scrollby() window.scrollto() element.scroll() element.scrollby() element.scrollto() properties scrolltooptions.top specifies the number of pixels along the y axis to scroll the window or element.
... scrolltooptions.left specifies the number of pixels along the x axis to scroll the window or element.
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WebGLRenderingContext.depthFunc() - Web APIs
the webglrenderingcontext.depthfunc() method of the webgl api specifies a function that compares incoming pixel depth to the current depth buffer value.
... syntax void gl.depthfunc(func); parameters func a glenum specifying the depth comparison function, which sets the conditions under which the pixel will be drawn.
...possible values are: gl.never (never pass) gl.less (pass if the incoming value is less than the depth buffer value) gl.equal (pass if the incoming value equals the the depth buffer value) gl.lequal (pass if the incoming value is less than or equal to the depth buffer value) gl.greater (pass if the incoming value is greater than the depth buffer value) gl.notequal (pass if the incoming value is not equal to the depth buffer value) gl.gequal (pass if the incoming value is greater than or equal to the depth buffer value) gl.always (always pass) return value none.
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XRPermissionDescriptor - Web APIs
to that end, the xrpermissiondescriptor dictionary is used to describe the webxr features the app needs to use, as well as those features it would like ot use if permision is granted.
... the xrpermissiondescriptor's name must be set to xr in order to direct the permissions api to correctly handle the request as applying to webxr.
... properties in addition to inheriting the properties of the parent interface, permissiondescriptor, xrpermissiondescriptor provides the following properties.
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XRWebGLLayerInit.depth - Web APIs
when using the xrwebgllayer() constructor to create a new webgl rendering layer for webxr, providing as the layerinit parameter an object whose depth property is false will request that the new layer be created without a depth buffer.
... syntax let layerinit = { depth: false }; let gllayer = new xrwebgllayer(xrsession, gl, layerinit); let gllayer = new xrwebgllayer(xrsession, gl, { depth: false }); value a boolean which can be set to false to specify that the new webgl layer should not have a depth buffer.
... this means that the only source for depth information is the vertex coordinates, and reduces the accuracy and quality of rendering, but may potentially affect the performance of rendering as well.
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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.
...this document describes techniques to make javascript widgets accessible with the keyboard.
...when set to 0, the element becomes focusable by keyboard and script.
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:optional - CSS: Cascading Style Sheets
the :optional css pseudo-class represents any <input>, <select>, or <textarea> element that does not have the required attribute set on it.
... /* selects any optional <input> */ input:optional { border: 1px dashed black; } this pseudo-class is useful for styling fields that are not required to submit a form.
... syntax :optional examples see :invalid for an example.
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<sub>: The Subscript element - HTML: Hypertext Markup Language
the html subscript element (<sub>) specifies inline text which should be displayed as subscript for solely typographical reasons.
... subscripts are typically rendered with a lowered baseline using smaller text.
... permitted parents any element that accepts phrasing content.
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List of default Accept values - HTTP
this article documents the default values for the http accept header for specific inputs and browser versions.
... value comment firefox text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 (since firefox 66) text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 (in firefox 65) text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 (before) in firefox 65 and earlier, this value can be modified using the network.http.accept.default parameter.
... (source) safari, chrome text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8 (source) safari 5 text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 this is an improvement over earlier accept headers as it no longer ranks image/png above text/html internet explorer 8 image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/x-shockwave-flash, application/msword, */* see ie and the accept header (ieinternals' msdn blog).
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The arguments object - JavaScript
description note: if you're writing es6 compatible code, then rest parameters should be preferred.
...see §description for details.
...it is similar, but lacks all array properties except length.
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Array.prototype.filter() - JavaScript
it accepts three arguments: element the current element being processed in the array.
... indexoptional the index of the current element being processed in the array.
... arrayoptional the array filter was called upon.
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Array.prototype.find() - JavaScript
index optional the index (position) of the current element in the array.
... array optional the array that find was called on.
... thisarg optional object to use as this inside callback.
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Array.prototype.flatMap() - JavaScript
it is identical to a map() followed by a flat() of depth 1, but flatmap() is often quite useful, as merging both into one method is slightly more efficient.
... indexoptional the index of the current element being processed in the array.
... arrayoptional the array map was called upon.
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