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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Compatibility Standard</title>
<link href="https://www.whatwg.org/style/specification" rel="stylesheet">
<link href="https://resources.whatwg.org/bikeshed.css" rel="stylesheet">
<link href="https://resources.whatwg.org/logo-compat.svg" rel="icon">
<meta content="Bikeshed 1.0.0" name="generator">
</head>
<body class="h-entry status-LS">
<div class="head">
<p data-fill-with="logo"><a class="logo" href="https://whatwg.org/">
<img alt="WHATWG" height="100" src="https://resources.whatwg.org/logo-compat.svg">
</a>
</p>
<h1 class="p-name no-ref" id="title">Compatibility</h1>
<h2 class="no-num no-toc no-ref heading settled" id="subtitle"><span class="content">Living Standard — Last Updated
<time class="dt-updated" datetime="2016-01-27">27 January 2016</time></span></h2>
<div data-fill-with="spec-metadata">
<dl>
<dt>Issue Tracking:
<dd><a href="https://github.com/whatwg/compat/issues/">GitHub</a>
<dt>Participate:
<dd><span><a href="https://github.com/whatwg/compat">GitHub whatwg/compat</a> (<a href="https://github.com/whatwg/compat/issues/new">new issue</a>, <a href="https://github.com/whatwg/compat/issues">open issues</a>)</span>
<dd><span><a href="https://wiki.whatwg.org/wiki/IRC">IRC: #whatwg on Freenode</a></span>
<dt>Commits:
<dd><span><a href="https://github.com/whatwg/compat/commits">GitHub whatwg/compat/commits</a></span>
<dd><span><a href="https://twitter.com/compatstandard">@compatstandard</a></span>
</dl>
</div>
<div data-fill-with="warning"></div>
</div>
<h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>
<div class="p-summary" data-fill-with="abstract">
<p>This standard describes a collection of non-standard (and often vendor-prefixed) CSS properties and DOM APIs that web browsers need to support for compatibility with the de facto web.</p>
</div>
<div data-fill-with="at-risk"></div>
<h2 class="no-num no-toc no-ref heading settled" id="contents"><span class="content">Table of Contents</span></h2>
<div data-fill-with="table-of-contents" role="navigation">
<ul class="toc" role="directory">
<li><a href="#introduction"><span class="secno">1</span> <span class="content">Introduction</span></a>
<li><a href="#conformance"><span class="secno">2</span> <span class="content">Conformance</span></a>
<li><a href="#css-compat-section"><span class="secno">3</span> <span class="content">CSS Compatibility</span></a>
<ul class="toc">
<li><a href="#css-at-rules"><span class="secno">3.1</span> <span class="content">CSS At-rules</span></a>
<li><a href="#css-media-queries"><span class="secno">3.2</span> <span class="content">CSS Media Queries</span></a>
<ul class="toc">
<li><a href="#css-media-queries-webkit-device-pixel-ratio"><span class="secno">3.2.1</span> <span class="content">
<code><span class="property">-webkit-device-pixel-ratio</span></code>
</span></a>
<li><a href="#css-media-queries-webkit-transform-3d"><span class="secno">3.2.2</span> <span class="content">
<code><span class="property">-webkit-transform-3d</span></code>
</span></a>
</ul>
<li><a href="#css-<image>-type"><span class="secno">3.3</span> <span class="content">CSS Gradients</span></a>
<ul class="toc">
<li><a href="#css-gradients-webkit-linear-gradient"><span class="secno">3.3.1</span> <span class="content">
<code><span class="css">-webkit-linear-gradient()</span></code>
</span></a>
<li><a href="#css-gradients-webkit-radial-gradient"><span class="secno">3.3.2</span> <span class="content">
<code><span class="css">-webkit-radial-gradient()</span></code>
</span></a>
<li><a href="#css-gradients-repeating-webkit-linear-gradient"><span class="secno">3.3.3</span> <span class="content">
<code><span class="css">-webkit-repeating-linear-gradient()</span></code>
</span></a>
<li><a href="#css-gradients-repeating-webkit-radial-gradient"><span class="secno">3.3.4</span> <span class="content">
<code><span class="css">-webkit-repeating-radial-gradient()</span></code>
</span></a>
</ul>
<li><a href="#css-properties"><span class="secno">3.4</span> <span class="content">CSS Properties</span></a>
<ul class="toc">
<li><a href="#css-simple-aliases"><span class="secno">3.4.1</span> <span class="content">Simple property aliases</span></a>
<li><a href="#css-prefixed-aliases"><span class="secno">3.4.2</span> <span class="content">Prefixed property aliases</span></a>
<li><a href="#css-property-mappings"><span class="secno">3.4.3</span> <span class="content">Property mappings</span></a>
<li><a href="#css-keyword-mappings"><span class="secno">3.4.4</span> <span class="content">Keyword mappings</span></a>
</ul>
</ul>
<li><a href="#dom-compat-section"><span class="secno">4</span> <span class="content">DOM Compatibility</span></a>
<ul class="toc">
<li><a href="#webkitcssmatrix-interface"><span class="secno">4.1</span> <span class="content">The <code class="idl"><span>WebKitCSSMatrix</span></code> interface</span></a>
<ul class="toc">
<li><a href="#webkitcssmatrix-constructors"><span class="secno">4.1.1</span> <span class="content">Constructors</span></a>
<li><a href="#webkitcssmatrix-attributes"><span class="secno">4.1.2</span> <span class="content"><code class="idl"><span>WebKitCSSMatrix</span></code> attributes</span></a>
<li><a href="#webkitcssmatrix-mutable-methods"><span class="secno">4.1.3</span> <span class="content"><code class="idl"><span>WebKitCSSMatrix</span></code> mutable methods</span></a>
<li><a href="#webkitcssmatrix-immutable-methods"><span class="secno">4.1.4</span> <span class="content"><code class="idl"><span>WebKitCSSMatrix</span></code> immutable methods</span></a>
</ul>
<li><a href="#windoworientation-interface"><span class="secno">4.2</span> <span class="content"><span><code>window.orientation</code></span> API</span></a>
<ul class="toc">
<li><a href="#dfn-window-orientation-angle"><span class="secno">4.2.1</span> <span class="content"><span><code>window.orientation</code></span> angle</span></a>
<li><a href="#event-handlers"><span class="secno">4.2.2</span> <span class="content">Event Handlers on <code class="idl"><span>Window</span></code> objects and <code><code><span>body</span></code></code> elements</span></a>
</ul>
</ul>
<li><a href="#acknowledgements"><span class="secno"></span> <span class="content">Acknowledgements</span></a>
<li><a href="#index"><span class="secno"></span> <span class="content">Index</span></a>
<ul class="toc">
<li><a href="#index-defined-here"><span class="secno"></span> <span class="content">Terms defined by this specification</span></a>
<li><a href="#index-defined-elsewhere"><span class="secno"></span> <span class="content">Terms defined by reference</span></a>
</ul>
<li><a href="#references"><span class="secno"></span> <span class="content">References</span></a>
<ul class="toc">
<li><a href="#normative"><span class="secno"></span> <span class="content">Normative References</span></a>
</ul>
<li><a href="#property-index"><span class="secno"></span> <span class="content">Property Index</span></a>
<ul class="toc">
<li><a href="#media-descriptor-table"><span class="secno"></span> <span class="content"><span>@media</span> Descriptors</span></a>
</ul>
<li><a href="#idl-index"><span class="secno"></span> <span class="content">IDL Index</span></a>
</ul></div>
<main>
<script async="" src="https://resources.whatwg.org/file-issue.js"></script>
<h2 class="heading settled" data-level="1" id="introduction"><span class="secno">1. </span><span class="content">Introduction</span><a class="self-link" href="#introduction"></a></h2>
<em>This section is non-normative.</em>
<p>There exists an increasingly large corpus of web content that depends on web browsers supporting a number of <code>webkit</code>-prefixed CSS properties and DOM APIs for functionality or layout. This holds especially true for mobile-optimized web content.</p>
<p>This specification aims to describe the minimal set of <code>webkit</code>-prefixed CSS properties and DOM APIs that user agents are required to support for web compatibility.</p>
<div class="XXX">
The <a href="https://wiki.mozilla.org/Compatibility/Mobile/Non_Standard_Compatibility">Non-Standard Compatibility</a> wiki page will serve as a rough guide for what this specification intends to cover.
</div>
<h2 class="heading settled" data-level="2" id="conformance"><span class="secno">2. </span><span class="content">Conformance</span><a class="self-link" href="#conformance"></a></h2>
All diagrams, examples, and notes in this specification are
non-normative, as are all sections explicitly marked non-normative.
Everything else in this specification is normative.
<p>The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in RFC 2119.
For readability, these words do not appear in all uppercase letters in this
specification. <a data-link-type="biblio" href="#biblio-rfc2119">[RFC2119]</a></p>
<p>Requirements phrased in the imperative as part of algorithms
(such as "strip any leading space characters" or "return false and
terminate these steps") are to be interpreted with the meaning of the
keyword ("must", "should", "may", etc.) used in introducing the
algorithm.</p>
<p>Conformance requirements phrased as algorithms or specific steps
may be implemented in any manner, so long as the end result is
equivalent. (In particular, the algorithms defined in this
specification are intended to be easy to follow, and not intended to
be performant.)</p>
<h2 class="heading settled" data-level="3" id="css-compat-section"><span class="secno">3. </span><span class="content">CSS Compatibility</span><a class="self-link" href="#css-compat-section"></a></h2>
<h3 class="heading settled" data-level="3.1" id="css-at-rules"><span class="secno">3.1. </span><span class="content">CSS At-rules</span><a class="self-link" href="#css-at-rules"></a></h3>
<p>The following <code>-webkit-</code> <a data-link-type="dfn" href="http://www.w3.org/TR/CSS/#vendor-prefix">vendor prefixed</a> at-rules must be supported as aliases of the corresponding unprefixed at-rules:</p>
<table>
<thead>
<tr>
<th><code>-webkit-</code> prefixed at-rule alias
<th>unprefixed at-rule
<tbody>
<tr>
<td><code><dfn class="css" data-dfn-type="at-rule" data-export="" id="at-ruledef--webkit-keyframes" type="at-rule">@-webkit-keyframes<a class="self-link" href="#at-ruledef--webkit-keyframes"></a></dfn></code>
<td><code><a class="css" data-link-type="at-rule" href="https://drafts.csswg.org/css-animations-1/#at-ruledef-keyframes">@keyframes</a></code>
</table>
<h3 class="heading settled" data-level="3.2" id="css-media-queries"><span class="secno">3.2. </span><span class="content">CSS Media Queries</span><a class="self-link" href="#css-media-queries"></a></h3>
<h4 class="heading settled" data-level="3.2.1" id="css-media-queries-webkit-device-pixel-ratio"><span class="secno">3.2.1. </span><span class="content">
<code><a class="property" data-link-type="propdesc" href="#descdef-media--webkit-device-pixel-ratio">-webkit-device-pixel-ratio</a></code>
</span><a class="self-link" href="#css-media-queries-webkit-device-pixel-ratio"></a></h4>
<table class="definition descdef mq">
<tbody>
<tr>
<th>Name:
<td><dfn class="css" data-dfn-for="@media" data-dfn-type="descriptor" data-export="" id="descdef-media--webkit-device-pixel-ratio">-webkit-device-pixel-ratio<a class="self-link" href="#descdef-media--webkit-device-pixel-ratio"></a></dfn>
<tr>
<th>For:
<td><a class="css" data-link-type="at-rule" href="https://drafts.csswg.org/css-conditional-3/#at-ruledef-media">@media</a>
<tr>
<th>Value:
<td class="prod"><a class="production css" data-link-type="type" href="https://drafts.csswg.org/css-values-3/#number-value"><number></a>
<tr>
<th>Type:
<td>range</table>
<p><code><a class="property" data-link-type="propdesc" href="#descdef-media--webkit-device-pixel-ratio">-webkit-device-pixel-ratio</a></code> must be treated as an alias of the <code><a data-link-type="dfn" href="http://www.w3.org/TR/mediaqueries-4/#descdef-resolution">resolution</a></code> range type <a data-link-type="dfn" href="http://www.w3.org/TR/mediaqueries-4/#media-feature">media feature</a>, with its value interpreted as a <a data-link-type="dfn" href="https://drafts.csswg.org/css-values-3/#dppx">dppx</a> unit.</p>
<p>The <code>min-</code> or <code>max-</code> <a data-link-type="dfn" href="http://www.w3.org/TR/mediaqueries-4/#mq-min-max">prefixes on range features</a> must not apply to <code><a class="property" data-link-type="propdesc" href="#descdef-media--webkit-device-pixel-ratio">-webkit-device-pixel-ratio</a></code>, instead the following aliases must be used:</p>
<table>
<thead>
<tr>
<th>legacy <code>-webkit-</code> prefixed range <a data-link-type="dfn" href="http://www.w3.org/TR/mediaqueries-4/#media-feature">media feature</a> alias
<th>standard prefixed range <a data-link-type="dfn" href="http://www.w3.org/TR/mediaqueries-4/#media-feature">media feature</a>
<tbody>
<tr>
<td><code><dfn class="css" data-dfn-for="@media" data-dfn-type="descriptor" data-export="" id="descdef-media--webkit-min-device-pixel-ratio">-webkit-min-device-pixel-ratio<a class="self-link" href="#descdef-media--webkit-min-device-pixel-ratio"></a></dfn></code>
<td><code><a data-link-type="dfn" href="http://www.w3.org/TR/mediaqueries-4/#descdef-resolution">min-resolution</a></code>
<tr>
<td><code><dfn class="css" data-dfn-for="@media" data-dfn-type="descriptor" data-export="" id="descdef-media--webkit-max-device-pixel-ratio">-webkit-max-device-pixel-ratio<a class="self-link" href="#descdef-media--webkit-max-device-pixel-ratio"></a></dfn></code>
<td><code><a data-link-type="dfn" href="http://www.w3.org/TR/mediaqueries-4/#descdef-resolution">max-resolution</a></code>
</table>
<h4 class="heading settled" data-level="3.2.2" id="css-media-queries-webkit-transform-3d"><span class="secno">3.2.2. </span><span class="content">
<code><a class="property" data-link-type="propdesc" href="#descdef-media--webkit-transform-3d">-webkit-transform-3d</a></code>
</span><a class="self-link" href="#css-media-queries-webkit-transform-3d"></a></h4>
<table class="definition descdef mq">
<tbody>
<tr>
<th>Name:
<td><dfn class="css" data-dfn-for="@media" data-dfn-type="descriptor" data-export="" id="descdef-media--webkit-transform-3d">-webkit-transform-3d<a class="self-link" href="#descdef-media--webkit-transform-3d"></a></dfn>
<tr>
<th>For:
<td><a class="css" data-link-type="at-rule" href="https://drafts.csswg.org/css-conditional-3/#at-ruledef-media">@media</a>
<tr>
<th>Value:
<td class="prod"><a class="production css" data-link-type="type" href="https://drafts.csswg.org/mediaqueries-4/#typedef-mq-boolean"><mq-boolean></a>
<tr>
<th>Accepts min/max prefixes:
<td>no</table>
<p>The <code><a class="property" data-link-type="propdesc" href="#descdef-media--webkit-transform-3d">-webkit-transform-3d</a></code> media feature is used to query whether the user agent supports CSS 3D transforms. <a data-link-type="biblio" href="#biblio-css-transforms-1">[css-transforms-1]</a></p>
<p>If the user agent supports 3D transforms, the value will be 1. Otherwise the value is 0.</p>
<h3 class="heading settled" data-level="3.3" id="css-<image>-type"><span class="secno">3.3. </span><span class="content">CSS Gradients</span><a class="self-link" href="#css-%3Cimage%3E-type"></a></h3>
<h4 class="heading settled" data-level="3.3.1" id="css-gradients-webkit-linear-gradient"><span class="secno">3.3.1. </span><span class="content">
<code><a class="css" data-link-type="maybe" href="#funcdef--webkit-linear-gradient">-webkit-linear-gradient()</a></code>
</span><a class="self-link" href="#css-gradients-webkit-linear-gradient"></a></h4>
<p><code><dfn class="css" data-dfn-type="function" data-export="" id="funcdef--webkit-linear-gradient">-webkit-linear-gradient()<a class="self-link" href="#funcdef--webkit-linear-gradient"></a></dfn></code> must be treated as an alias of <a data-link-type="dfn" href="http://www.w3.org/TR/2011/WD-css3-images-20110217/#ltlinear-gradient">linear-gradient</a> as defined in <a data-link-type="biblio" href="#biblio-css3-images-20110217">[css3-images-20110217]</a>.</p>
<h4 class="heading settled" data-level="3.3.2" id="css-gradients-webkit-radial-gradient"><span class="secno">3.3.2. </span><span class="content">
<code><a class="css" data-link-type="maybe" href="#funcdef--webkit-radial-gradient">-webkit-radial-gradient()</a></code>
</span><a class="self-link" href="#css-gradients-webkit-radial-gradient"></a></h4>
<p><code><dfn class="css" data-dfn-type="function" data-export="" id="funcdef--webkit-radial-gradient">-webkit-radial-gradient()<a class="self-link" href="#funcdef--webkit-radial-gradient"></a></dfn></code> must be treated as an alias of <a data-link-type="dfn" href="http://www.w3.org/TR/2011/WD-css3-images-20110217/#ltradial-gradient">radial-gradient</a> as defined in <a data-link-type="biblio" href="#biblio-css3-images-20110217">[css3-images-20110217]</a>.</p>
<h4 class="heading settled" data-level="3.3.3" id="css-gradients-repeating-webkit-linear-gradient"><span class="secno">3.3.3. </span><span class="content">
<code><a class="css" data-link-type="maybe" href="#funcdef--webkit-repeating-linear-gradient">-webkit-repeating-linear-gradient()</a></code>
</span><a class="self-link" href="#css-gradients-repeating-webkit-linear-gradient"></a></h4>
<p><code><dfn class="css" data-dfn-type="function" data-export="" id="funcdef--webkit-repeating-linear-gradient">-webkit-repeating-linear-gradient()<a class="self-link" href="#funcdef--webkit-repeating-linear-gradient"></a></dfn></code> must be treated as an alias of <a data-link-type="dfn" href="http://www.w3.org/TR/2011/WD-css3-images-20110217/#ltrepeating-linear-gradient">repeating-linear-gradient</a> as defined in <a data-link-type="biblio" href="#biblio-css3-images-20110217">[css3-images-20110217]</a>.</p>
<h4 class="heading settled" data-level="3.3.4" id="css-gradients-repeating-webkit-radial-gradient"><span class="secno">3.3.4. </span><span class="content">
<code><a class="css" data-link-type="maybe" href="#funcdef--webkit-repeating-radial-gradient">-webkit-repeating-radial-gradient()</a></code>
</span><a class="self-link" href="#css-gradients-repeating-webkit-radial-gradient"></a></h4>
<p><code><dfn class="css" data-dfn-type="function" data-export="" id="funcdef--webkit-repeating-radial-gradient">-webkit-repeating-radial-gradient()<a class="self-link" href="#funcdef--webkit-repeating-radial-gradient"></a></dfn></code> must be treated as an alias of <a data-link-type="dfn" href="http://www.w3.org/TR/2011/WD-css3-images-20110217/#ltrepeating-radial-gradient">repeating-radial-gradient</a> as defined in <a data-link-type="biblio" href="#biblio-css3-images-20110217">[css3-images-20110217]</a>.</p>
<h3 class="heading settled" data-level="3.4" id="css-properties"><span class="secno">3.4. </span><span class="content">CSS Properties</span><a class="self-link" href="#css-properties"></a></h3>
<h4 class="heading settled" data-level="3.4.1" id="css-simple-aliases"><span class="secno">3.4.1. </span><span class="content">Simple property aliases</span><a class="self-link" href="#css-simple-aliases"></a></h4>
<p>The following <code>-webkit-</code> <a data-link-type="dfn" href="http://www.w3.org/TR/CSS/#vendor-prefix">vendor prefixed</a> properties must be supported as aliases of the corresponding unprefixed property:</p>
<table>
<thead>
<tr>
<th><code>-webkit-</code> prefixed property alias
<th>unprefixed property
<tbody>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_animation_name" type="property">-webkit-animation-name<a class="self-link" href="#_webkit_animation_name"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-animations-1/#propdef-animation-name">animation-name</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_animation_duration" type="property">-webkit-animation-duration<a class="self-link" href="#_webkit_animation_duration"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-animations-1/#propdef-animation-duration">animation-duration</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_animation_timing_function" type="property">-webkit-animation-timing-function<a class="self-link" href="#_webkit_animation_timing_function"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-animations-1/#propdef-animation-timing-function">animation-timing-function</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_animation_iteration_count" type="property">-webkit-animation-iteration-count<a class="self-link" href="#_webkit_animation_iteration_count"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-animations-1/#propdef-animation-iteration-count">animation-iteration-count</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_animation_direction" type="property">-webkit-animation-direction<a class="self-link" href="#_webkit_animation_direction"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-animations-1/#propdef-animation-direction">animation-direction</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_animation_play_state" type="property">-webkit-animation-play-state<a class="self-link" href="#_webkit_animation_play_state"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-animations-1/#propdef-animation-play-state">animation-play-state</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_animation_delay" type="property">-webkit-animation-delay<a class="self-link" href="#_webkit_animation_delay"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-animations-1/#propdef-animation-delay">animation-delay</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_animation_fill_mode" type="property">-webkit-animation-fill-mode<a class="self-link" href="#_webkit_animation_fill_mode"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-animations-1/#propdef-animation-fill-mode">animation-fill-mode</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_animation" type="property">-webkit-animation<a class="self-link" href="#_webkit_animation"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-animations-1/#propdef-animation">animation</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_backface_visibility" type="property">-webkit-backface-visibility<a class="self-link" href="#_webkit_backface_visibility"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-transforms-1/#propdef-backface-visibility">backface-visibility</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_background_clip" type="property">-webkit-background-clip<a class="self-link" href="#_webkit_background_clip"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-backgrounds-3/#background-clip">background-clip</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_background_origin" type="property">-webkit-background-origin<a class="self-link" href="#_webkit_background_origin"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-backgrounds-3/#background-origin">background-origin</a></code>
<tr>
<td>
<code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_background_size" type="property">-webkit-background-size<a class="self-link" href="#_webkit_background_size"></a></dfn></code>
<p class="XXX">
Not simple. See <a href="https://github.com/whatwg/compat/issues/28">issue #28</a>.
</p>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-backgrounds-3/#background-size">background-size</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_border_bottom_left_radius" type="property">-webkit-border-bottom-left-radius<a class="self-link" href="#_webkit_border_bottom_left_radius"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-backgrounds-3/#border-bottom-left-radius">border-bottom-left-radius</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_border_bottom_right_radius" type="property">-webkit-border-bottom-right-radius<a class="self-link" href="#_webkit_border_bottom_right_radius"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-backgrounds-3/#border-bottom-right-radius">border-bottom-right-radius</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_border_top_left_radius" type="property">-webkit-border-top-left-radius<a class="self-link" href="#_webkit_border_top_left_radius"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-backgrounds-3/#border-top-right-radius">border-top-right-radius</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_border_top_right_radius" type="property">-webkit-border-top-right-radius<a class="self-link" href="#_webkit_border_top_right_radius"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-backgrounds-3/#border-top-right-radius">border-top-right-radius</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_border_radius" type="property">-webkit-border-radius<a class="self-link" href="#_webkit_border_radius"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-backgrounds-3/#border-radius">border-radius</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_box_shadow" type="property">-webkit-box-shadow<a class="self-link" href="#_webkit_box_shadow"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-backgrounds-3/#box-shadow">box-shadow</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_box_sizing" type="property">-webkit-box-sizing<a class="self-link" href="#_webkit_box_sizing"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-ui-3/#propdef-box-sizing">box-sizing</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_filter" type="property">-webkit-filter<a class="self-link" href="#_webkit_filter"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.fxtf.org/filters/#propdef-filter">filter</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_perspective" type="property">-webkit-perspective<a class="self-link" href="#_webkit_perspective"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-transforms-1/#propdef-perspective">perspective</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_perspective_origin" type="property">-webkit-perspective-origin<a class="self-link" href="#_webkit_perspective_origin"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-transforms-1/#propdef-perspective-origin">perspective-origin</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_transform_origin" type="property">-webkit-transform-origin<a class="self-link" href="#_webkit_transform_origin"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-transforms-1/#propdef-transform-origin">transform-origin</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_transform_style" type="property">-webkit-transform-style<a class="self-link" href="#_webkit_transform_style"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-transforms-1/#propdef-transform-style">transform-style</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_transform" type="property">-webkit-transform<a class="self-link" href="#_webkit_transform"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-transforms-1/#propdef-transform">transform</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_transition_delay" type="property">-webkit-transition-delay<a class="self-link" href="#_webkit_transition_delay"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-transitions-1/#propdef-transition-delay">transition-delay</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_transition_duration" type="property">-webkit-transition-duration<a class="self-link" href="#_webkit_transition_duration"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-transitions-1/#propdef-transition-duration">transition-duration</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_transition_property" type="property">-webkit-transition-property<a class="self-link" href="#_webkit_transition_property"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-transitions-1/#propdef-transition-property">transition-property</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_transition_timing_function" type="property">-webkit-transition-timing-function<a class="self-link" href="#_webkit_transition_timing_function"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-transitions-1/#propdef-transition-timing-function">transition-timing-function</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_transition" type="property">-webkit-transition<a class="self-link" href="#_webkit_transition"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-transitions-1/#propdef-transition">transition</a></code>
</table>
<h4 class="heading settled" data-level="3.4.2" id="css-prefixed-aliases"><span class="secno">3.4.2. </span><span class="content">Prefixed property aliases</span><a class="self-link" href="#css-prefixed-aliases"></a></h4>
<p>The following <code>-webkit-</code> <a data-link-type="dfn" href="http://www.w3.org/TR/CSS/#vendor-prefix">vendor prefixed</a> properties must be supported as aliases of the corresponding unprefixed properties. If the user agent does not ship the unprefixed equivalent, the <code>-webkit-</code> prefixed property must be treated as an alias of the user agent’s own vendor prefixed property.</p>
<table>
<thead>
<tr>
<th><code>-webkit-</code> prefixed property alias
<th>(vendor prefixed) property
<tbody>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_text_size_adjust" type="property">-webkit-text-size-adjust<a class="self-link" href="#_webkit_text_size_adjust"></a></dfn></code>
<td><code>(-prefix-)<a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-size-adjust/#text-size-adjust">text-size-adjust</a></code>
</table>
<p><br></p>
<div class="note" role="note"> As soon as https://drafts.csswg.org/css-size-adjust/#text-size-adjust is unprefixable it can be defined as a "simple" alias.</div>
<h4 class="heading settled" data-level="3.4.3" id="css-property-mappings"><span class="secno">3.4.3. </span><span class="content">Property mappings</span><a class="self-link" href="#css-property-mappings"></a></h4>
<p>The following <code>-webkit-</code> <a data-link-type="dfn" href="http://www.w3.org/TR/CSS/#vendor-prefix">vendor prefixed</a> properties must be supported as mappings to the corresponding unprefixed property:</p>
<table>
<thead>
<tr>
<th><code>-webkit-</code> prefixed property
<th>unprefixed property
<tbody>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_box_flex" type="property">-webkit-box-flex<a class="self-link" href="#_webkit_box_flex"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex-grow">flex-grow</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_box_ordinal_group" type="property">-webkit-box-ordinal-group<a class="self-link" href="#_webkit_box_ordinal_group"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-flexbox-1/#propdef-order">order</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_box_align" type="property">-webkit-box-align<a class="self-link" href="#_webkit_box_align"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-align-3/#propdef-align-items">align-items</a></code>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_box_pack" type="property">-webkit-box-pack<a class="self-link" href="#_webkit_box_pack"></a></dfn></code>
<td><code><a class="property" data-link-type="propdesc" href="https://drafts.csswg.org/css-align-3/#propdef-justify-content">justify-content</a></code>
</table>
<h4 class="heading settled" data-level="3.4.4" id="css-keyword-mappings"><span class="secno">3.4.4. </span><span class="content">Keyword mappings</span><a class="self-link" href="#css-keyword-mappings"></a></h4>
<p>The following <code>-webkit-</code> <a data-link-type="dfn" href="http://www.w3.org/TR/CSS/#vendor-prefix">vendor prefixed</a> keywords must be supported as mappings to the corresponding unprefixed keyword:</p>
<table>
<thead>
<tr>
<th><code>-webkit-</code> prefixed keyword
<th>unprefixed property keyword
<tbody>
<tr>
<td><code><dfn data-dfn-type="dfn" data-noexport="" id="_webkit_box" type="property">-webkit-box<a class="self-link" href="#_webkit_box"></a></dfn></code>
<td><code><a class="css" data-link-type="maybe" href="https://drafts.csswg.org/css-display-3/#valdef-display-flex">flex</a></code>
</table>
<h2 class="heading settled" data-level="4" id="dom-compat-section"><span class="secno">4. </span><span class="content">DOM Compatibility</span><a class="self-link" href="#dom-compat-section"></a></h2>
<h3 class="heading settled" data-level="4.1" id="webkitcssmatrix-interface"><span class="secno">4.1. </span><span class="content">The <code class="idl"><a data-link-type="idl" href="#webkitcssmatrix">WebKitCSSMatrix</a></code> interface</span><a class="self-link" href="#webkitcssmatrix-interface"></a></h3>
<pre class="idl">[<a class="idl-code" data-link-type="constructor" href="#dom-webkitcssmatrix-webkitcssmatrix">Constructor</a>,
<a class="idl-code" data-link-type="constructor" href="#dom-webkitcssmatrix-webkitcssmatrix-transformlist">Constructor</a>(DOMString <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/WebKitCSSMatrix(transformList)" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-webkitcssmatrix-transformlist-transformlist">transformList<a class="self-link" href="#dom-webkitcssmatrix-webkitcssmatrix-transformlist-transformlist"></a></dfn>),
Exposed=Window]
interface <dfn class="idl-code" data-dfn-type="interface" data-export="" id="webkitcssmatrix">WebKitCSSMatrix<a class="self-link" href="#webkitcssmatrix"></a></dfn> : <a data-link-type="idl-name" href="https://drafts.fxtf.org/geometry/#dommatrix">DOMMatrix</a> {
// Mutable transform methods
<a data-link-type="idl-name" href="#webkitcssmatrix">WebKitCSSMatrix</a> <a class="idl-code" data-link-type="method" href="#dom-webkitcssmatrix-setmatrixvalue">setMatrixValue</a>(DOMString <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/setMatrixValue(transformList)" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-setmatrixvalue-transformlist-transformlist">transformList<a class="self-link" href="#dom-webkitcssmatrix-setmatrixvalue-transformlist-transformlist"></a></dfn>);
// Immutable transform methods
<a data-link-type="idl-name" href="#webkitcssmatrix">WebKitCSSMatrix</a> <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix" data-dfn-type="method" data-export="" data-lt="multiply(other)" id="dom-webkitcssmatrix-multiply">multiply<a class="self-link" href="#dom-webkitcssmatrix-multiply"></a></dfn>(<a data-link-type="idl-name" href="#webkitcssmatrix">WebKitCSSMatrix</a> <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/multiply(other)" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-multiply-other-other">other<a class="self-link" href="#dom-webkitcssmatrix-multiply-other-other"></a></dfn>);
<a data-link-type="idl-name" href="#webkitcssmatrix">WebKitCSSMatrix</a> <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix" data-dfn-type="method" data-export="" data-lt="inverse()" id="dom-webkitcssmatrix-inverse">inverse<a class="self-link" href="#dom-webkitcssmatrix-inverse"></a></dfn>();
<a data-link-type="idl-name" href="#webkitcssmatrix">WebKitCSSMatrix</a> <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix" data-dfn-type="method" data-export="" data-lt="translate(tx, ty, tz)|translate(tx, ty)|translate(tx)|translate()" id="dom-webkitcssmatrix-translate">translate<a class="self-link" href="#dom-webkitcssmatrix-translate"></a></dfn>(optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/translate(tx, ty, tz), WebKitCSSMatrix/translate(tx, ty), WebKitCSSMatrix/translate(tx), WebKitCSSMatrix/translate()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-translate-tx-ty-tz-tx">tx<a class="self-link" href="#dom-webkitcssmatrix-translate-tx-ty-tz-tx"></a></dfn> = 0,
optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/translate(tx, ty, tz), WebKitCSSMatrix/translate(tx, ty), WebKitCSSMatrix/translate(tx), WebKitCSSMatrix/translate()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-translate-tx-ty-tz-ty">ty<a class="self-link" href="#dom-webkitcssmatrix-translate-tx-ty-tz-ty"></a></dfn> = 0,
optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/translate(tx, ty, tz), WebKitCSSMatrix/translate(tx, ty), WebKitCSSMatrix/translate(tx), WebKitCSSMatrix/translate()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-translate-tx-ty-tz-tz">tz<a class="self-link" href="#dom-webkitcssmatrix-translate-tx-ty-tz-tz"></a></dfn> = 0);
<a data-link-type="idl-name" href="#webkitcssmatrix">WebKitCSSMatrix</a> <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix" data-dfn-type="method" data-export="" data-lt="scale(scaleX, scaleY, scaleZ)|scale(scaleX, scaleY)|scale(scaleX)|scale()" id="dom-webkitcssmatrix-scale">scale<a class="self-link" href="#dom-webkitcssmatrix-scale"></a></dfn>(optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/scale(scaleX, scaleY, scaleZ), WebKitCSSMatrix/scale(scaleX, scaleY), WebKitCSSMatrix/scale(scaleX), WebKitCSSMatrix/scale()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-scale-scalex-scaley-scalez-scalex">scaleX<a class="self-link" href="#dom-webkitcssmatrix-scale-scalex-scaley-scalez-scalex"></a></dfn> = 1,
optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/scale(scaleX, scaleY, scaleZ), WebKitCSSMatrix/scale(scaleX, scaleY), WebKitCSSMatrix/scale(scaleX), WebKitCSSMatrix/scale()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-scale-scalex-scaley-scalez-scaley">scaleY<a class="self-link" href="#dom-webkitcssmatrix-scale-scalex-scaley-scalez-scaley"></a></dfn>,
optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/scale(scaleX, scaleY, scaleZ), WebKitCSSMatrix/scale(scaleX, scaleY), WebKitCSSMatrix/scale(scaleX), WebKitCSSMatrix/scale()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-scale-scalex-scaley-scalez-scalez">scaleZ<a class="self-link" href="#dom-webkitcssmatrix-scale-scalex-scaley-scalez-scalez"></a></dfn> = 1);
<a data-link-type="idl-name" href="#webkitcssmatrix">WebKitCSSMatrix</a> <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix" data-dfn-type="method" data-export="" data-lt="rotate(rotX, rotY, rotZ)|rotate(rotX, rotY)|rotate(rotX)|rotate()" id="dom-webkitcssmatrix-rotate">rotate<a class="self-link" href="#dom-webkitcssmatrix-rotate"></a></dfn>(optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/rotate(rotX, rotY, rotZ), WebKitCSSMatrix/rotate(rotX, rotY), WebKitCSSMatrix/rotate(rotX), WebKitCSSMatrix/rotate()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-rotate-rotx-roty-rotz-rotx">rotX<a class="self-link" href="#dom-webkitcssmatrix-rotate-rotx-roty-rotz-rotx"></a></dfn> = 0,
optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/rotate(rotX, rotY, rotZ), WebKitCSSMatrix/rotate(rotX, rotY), WebKitCSSMatrix/rotate(rotX), WebKitCSSMatrix/rotate()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-rotate-rotx-roty-rotz-roty">rotY<a class="self-link" href="#dom-webkitcssmatrix-rotate-rotx-roty-rotz-roty"></a></dfn>,
optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/rotate(rotX, rotY, rotZ), WebKitCSSMatrix/rotate(rotX, rotY), WebKitCSSMatrix/rotate(rotX), WebKitCSSMatrix/rotate()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-rotate-rotx-roty-rotz-rotz">rotZ<a class="self-link" href="#dom-webkitcssmatrix-rotate-rotx-roty-rotz-rotz"></a></dfn>);
<a data-link-type="idl-name" href="#webkitcssmatrix">WebKitCSSMatrix</a> <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix" data-dfn-type="method" data-export="" data-lt="rotateAxisAngle(x, y, z, angle)|rotateAxisAngle(x, y, z)|rotateAxisAngle(x, y)|rotateAxisAngle(x)|rotateAxisAngle()" id="dom-webkitcssmatrix-rotateaxisangle">rotateAxisAngle<a class="self-link" href="#dom-webkitcssmatrix-rotateaxisangle"></a></dfn>(optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/rotateAxisAngle(x, y, z, angle), WebKitCSSMatrix/rotateAxisAngle(x, y, z), WebKitCSSMatrix/rotateAxisAngle(x, y), WebKitCSSMatrix/rotateAxisAngle(x), WebKitCSSMatrix/rotateAxisAngle()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-rotateaxisangle-x-y-z-angle-x">x<a class="self-link" href="#dom-webkitcssmatrix-rotateaxisangle-x-y-z-angle-x"></a></dfn> = 0,
optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/rotateAxisAngle(x, y, z, angle), WebKitCSSMatrix/rotateAxisAngle(x, y, z), WebKitCSSMatrix/rotateAxisAngle(x, y), WebKitCSSMatrix/rotateAxisAngle(x), WebKitCSSMatrix/rotateAxisAngle()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-rotateaxisangle-x-y-z-angle-y">y<a class="self-link" href="#dom-webkitcssmatrix-rotateaxisangle-x-y-z-angle-y"></a></dfn> = 0,
optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/rotateAxisAngle(x, y, z, angle), WebKitCSSMatrix/rotateAxisAngle(x, y, z), WebKitCSSMatrix/rotateAxisAngle(x, y), WebKitCSSMatrix/rotateAxisAngle(x), WebKitCSSMatrix/rotateAxisAngle()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-rotateaxisangle-x-y-z-angle-z">z<a class="self-link" href="#dom-webkitcssmatrix-rotateaxisangle-x-y-z-angle-z"></a></dfn> = 0,
optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/rotateAxisAngle(x, y, z, angle), WebKitCSSMatrix/rotateAxisAngle(x, y, z), WebKitCSSMatrix/rotateAxisAngle(x, y), WebKitCSSMatrix/rotateAxisAngle(x), WebKitCSSMatrix/rotateAxisAngle()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-rotateaxisangle-x-y-z-angle-angle">angle<a class="self-link" href="#dom-webkitcssmatrix-rotateaxisangle-x-y-z-angle-angle"></a></dfn> = 0);
<a data-link-type="idl-name" href="#webkitcssmatrix">WebKitCSSMatrix</a> <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix" data-dfn-type="method" data-export="" data-lt="skewX(sx)|skewX()" id="dom-webkitcssmatrix-skewx">skewX<a class="self-link" href="#dom-webkitcssmatrix-skewx"></a></dfn>(optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/skewX(sx), WebKitCSSMatrix/skewX()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-skewx-sx-sx">sx<a class="self-link" href="#dom-webkitcssmatrix-skewx-sx-sx"></a></dfn> = 0);
<a data-link-type="idl-name" href="#webkitcssmatrix">WebKitCSSMatrix</a> <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix" data-dfn-type="method" data-export="" data-lt="skewY(sy)|skewY()" id="dom-webkitcssmatrix-skewy">skewY<a class="self-link" href="#dom-webkitcssmatrix-skewy"></a></dfn>(optional unrestricted double <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix/skewY(sy), WebKitCSSMatrix/skewY()" data-dfn-type="argument" data-export="" id="dom-webkitcssmatrix-skewy-sy-sy">sy<a class="self-link" href="#dom-webkitcssmatrix-skewy-sy-sy"></a></dfn> = 0);
};
</pre>
<p>The <code class="idl"><a data-link-type="idl" href="#webkitcssmatrix">WebKitCSSMatrix</a></code> interface represents a 4×4 homogeneous matrix with methods useful for 2D and 3D transform operations.</p>
<p>The <code class="idl"><a data-link-type="idl" href="#webkitcssmatrix">WebKitCSSMatrix</a></code> interface may be implemented as a subclass of the <code class="idl"><a data-link-type="idl" href="https://drafts.fxtf.org/geometry/#dommatrix">DOMMatrix</a></code> and <code class="idl"><a data-link-type="idl" href="https://drafts.fxtf.org/geometry/#dommatrixreadonly">DOMMatrixReadOnly</a></code> interfaces, defined in Geometry Interfaces Module Level 1 <a data-link-type="biblio" href="#biblio-geometry-1">[geometry-1]</a>, with key differences noted below.</p>
<h4 class="heading settled" data-level="4.1.1" id="webkitcssmatrix-constructors"><span class="secno">4.1.1. </span><span class="content">Constructors</span><a class="self-link" href="#webkitcssmatrix-constructors"></a></h4>
<dl class="domintro">
<dt>
<code><var>matrix</var> = new <a class="idl-code" data-link-type="constructor" href="#dom-webkitcssmatrix-webkitcssmatrix">WebKitCSSMatrix()</a></code>
<dd>
Returns a new <code class="idl"><a data-link-type="idl" href="#webkitcssmatrix">WebKitCSSMatrix</a></code> object.
</dl>
<p>The <dfn class="idl-code" data-dfn-for="WebKitCSSMatrix" data-dfn-type="constructor" data-export="" id="dom-webkitcssmatrix-webkitcssmatrix">WebKitCSSMatrix()<a class="self-link" href="#dom-webkitcssmatrix-webkitcssmatrix"></a></dfn>
constructor, when invoked, must run these steps:</p>
<ol>
<li>
Let <var>m</var> be a new <code class="idl"><a data-link-type="idl" href="#webkitcssmatrix">WebKitCSSMatrix</a></code> object.
<li>For m, set the
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m11-element">m11 element</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m22-element">m22 element</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m33-element">m33 element</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m44-element">m44 element</a> to 1. Set the
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m12-element">m12 element</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m13-element">m13 element</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m14-element">m14 element</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m21-element">m21 element</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m23-element">m23 element</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m24-element">m24 element</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m31-element">m31 element</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m32-element">m32 element</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m34-element">m34 element</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m41-element">m41 element</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m42-element">m42 element</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#m43-element">m43 element</a> to 0.
<li>
Return <var>m</var>.
</ol>
<dl class="domintro">
<dt>
<code><var>matrix</var> = new <a class="idl-code" data-link-type="constructor" href="#dom-webkitcssmatrix-webkitcssmatrix-transformlist">WebKitCSSMatrix</a>(transformList)</code>
<dd>
Returns a new <code class="idl"><a data-link-type="idl" href="#webkitcssmatrix">WebKitCSSMatrix</a></code> object.
</dl>
<p>The
<dfn class="idl-code" data-dfn-for="WebKitCSSMatrix" data-dfn-type="constructor" data-export="" id="dom-webkitcssmatrix-webkitcssmatrix-transformlist">WebKitCSSMatrix(transformList)<a class="self-link" href="#dom-webkitcssmatrix-webkitcssmatrix-transformlist"></a></dfn>
constructor, when invoked, must run these steps:</p>
<ol>
<li>
Let <var>m</var> be a new <code class="idl"><a data-link-type="idl" href="#webkitcssmatrix">WebKitCSSMatrix</a></code> object.
<li>Return the result of the algorithm for the static <code class="idl"><a data-link-type="idl" href="https://drafts.fxtf.org/geometry/#dommatrixreadonly">DOMMatrixReadOnly</a></code> <a class="idl-code" data-link-type="method" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-fromstring0">fromString(transformList)</a> method, as <var>m</var>.
</ol>
<h4 class="heading settled" data-level="4.1.2" id="webkitcssmatrix-attributes"><span class="secno">4.1.2. </span><span class="content"><code class="idl"><a data-link-type="idl" href="#webkitcssmatrix">WebKitCSSMatrix</a></code> attributes</span><a class="self-link" href="#webkitcssmatrix-attributes"></a></h4>
<p><code class="idl"><a data-link-type="idl" href="#webkitcssmatrix">WebKitCSSMatrix</a></code> objects must inherit the following attributes from <code class="idl"><a data-link-type="idl" href="https://drafts.fxtf.org/geometry/#dommatrixreadonly">DOMMatrixReadOnly</a></code>:</p>
<p><a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m11">m11 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m22">m22 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m33">m33 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m44">m44 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m12">m12 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m13">m13 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m14">m14 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m21">m21 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m23">m23 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m24">m24 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m31">m31 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m32">m32 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m34">m34 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m41">m41 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m42">m42 attribute</a>,
<a class="idl-code" data-link-type="attribute" href="https://drafts.fxtf.org/geometry/#dom-dommatrixreadonly-m43">m43 attribute</a>,