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<pre class="metadata">
Group: WHATWG
H1: Compatibility
Shortname: compat
Text Macro: TWITTER compatstandard
Text Macro: LATESTRD 2023-06
Abstract: This standard describes a collection of web platform features that web browsers need to support for compatibility with the de facto web.
Translation: ja https://triple-underscore.github.io/compat-ja.html
Indent: 2
Markup Shorthands: dfn yes
</pre>
<pre class="anchors">
urlPrefix: https://w3c.github.io/screen-orientation/;
type: interface
text: ScreenOrientation; url: #screenorientation-interface
type: dfn
text: current orientation angle; url: #dfn-current-orientation-angle
urlPrefix: https://www.w3.org/TR/CSS/; spec: CSS2
type: dfn
text: vendor prefix; url: #vendor-prefix
urlPrefix: https://drafts.csswg.org/mediaqueries-4/; spec: mediaqueries-4
type: dfn
text: media query; url: #media-query
text: media feature; url: #media-feature
text: resolution; url: #descdef-media-resolution
text: min-resolution; url: #descdef-media-resolution
text: max-resolution; url: #descdef-media-resolution
text: prefixes on range features; url: #mq-min-max
urlPrefix: https://www.w3.org/TR/2011/WD-css3-images-20110217/; spec: css3-images-20110217
type: dfn
text: linear-gradient; url: #ltlinear-gradient
text: radial-gradient; url: #ltradial-gradient
text: repeating-linear-gradient; url: #ltrepeating-linear-gradient
text: repeating-radial-gradient; url: #ltrepeating-radial-gradient
urlPrefix: https://drafts.csswg.org/css-backgrounds-4/
type: dfn
text: background-clip; url: #propdef-background-clip
urlPrefix: https://drafts.fxtf.org/css-masking-1/
type: dfn
text: clipping path; url: #clipping-path
urlPrefix: https://drafts.csswg.org/css-values-3/
type: dfn
text: dppx; url: #dppx
urlPrefix: https://html.spec.whatwg.org/multipage/
urlPrefix: document-sequences.html
type: dfn
for: browsing context
text: is popup
text: opener browsing context
text: opener origin at creation
urlPrefix: https://privacycg.github.io/nav-tracking-mitigations/
type: dfn
for: top-level traversable
text: bounce tracking record; url: top-level-traversable-bounce-tracking-record
for: bounce tracking record
text: initial host; url: #bounce-tracking-record-initial-host
text: bounce set; url: #bounce-tracking-record-bounce-set
text: user activation set; url: #bounce-tracking-record-user-activation-set
</pre>
<pre class="biblio">
{
"HTTP-SEMANTICS": {
"href": "https://httpwg.org/http-core/draft-ietf-httpbis-semantics-latest.html",
"title": "HTTP Semantics",
"authors": [ "R. Fielding", "M. Nottingham", "J. Reschke" ]
}
}
</pre>
<pre class=link-defaults>
spec:css-animations-1; type:property; text:animation-delay
spec:css-borders-4; type:property; text:box-shadow
spec:css-borders-4; type:property; text:border-radius
spec:css-borders-4; type:property; text:border-bottom-left-radius
spec:css-borders-4; type:property; text:border-bottom-right-radius
spec:css-borders-4; type:property; text:border-top-left-radius
spec:css-borders-4; type:property; text:border-top-right-radius
spec:css-conditional-3; type:at-rule; text:@media
spec:css-display-3; type:value; for:display; text:flex
spec:css-flexbox-1; type:value; text:inline-flex
spec:css-syntax-3; type:dfn; text:invalid
spec:filter-effects-1; type:property; text:filter
spec:infra; type:dfn; text:list
spec:infra; type:dfn; text:user agent
spec:svg2; type:dfn; text:fill
spec:svg2; type:dfn; text:stroke
spec:url; type:dfn; for:url; text:host
</pre>
<!-- Commented out until we know what the heck to put here:
<h2 id='goals'>Goals</h2> -->
<h2 id='introduction'>Introduction</h2>
<em>This section is non-normative.</em>
There exists an increasingly large corpus of web content that depends on web browsers supporting a
number of specific vendor CSS properties and DOM APIs for functionality or layout.
This holds especially true for mobile-optimized web content, which is highly dependent on
<code>-webkit-</code>-prefixed properties.
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, which aren't
specified elsewhere.
The HTTP <code>User-Agent</code> header field as found in major browsers today is also described.
<h2 id='conformance'>Conformance</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.
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. [[!RFC2119]]
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.
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.)
<h2 id="css-compat-section">CSS Compatibility</h2>
<h3 id="css-at-rules">CSS At-rules</h3>
The following <code>-webkit-</code> <a>vendor prefixed</a> [=at-rules=] must be supported as aliases
of the corresponding unprefixed [=at-rules=]:
<table>
<thead>
<tr>
<th><code>-webkit-</code> prefixed at-rule alias</th>
<th>unprefixed at-rule</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><dfn at-rule>@-webkit-keyframes</dfn></code></td>
<td><code><a>@keyframes</a></code></td>
</tr>
</tbody>
</table>
<h3 id="css-media-queries">CSS Media Queries</h3>
<h4 id="css-media-queries-webkit-device-pixel-ratio">
<code>'@media/-webkit-device-pixel-ratio'</code>
</h4>
<pre class='descdef mq'>
Name: '@media/-webkit-device-pixel-ratio'
Value: <<number>>
For: @media
Type: range
</pre>
<code>'@media/-webkit-device-pixel-ratio'</code> must be treated as an alias of the
<code><a>resolution</a></code> range type <a>media feature</a>, with its value interpreted as a
<a>dppx</a> unit.
The <code>min-</code> or <code>max-</code> <a>prefixes on range features</a> must not apply to
<code>'@media/-webkit-device-pixel-ratio'</code>, instead the following aliases must be used:
<table>
<thead>
<tr>
<th>legacy <code>-webkit-</code> prefixed range <a>media feature</a> alias</th>
<th>standard prefixed range <a>media feature</a></th>
</tr>
</thead>
<tbody>
<tr>
<td><code><dfn descriptor for="@media">-webkit-min-device-pixel-ratio</dfn></code></td>
<td><code><a>min-resolution</a></code></td>
</tr>
<tr>
<td><code><dfn descriptor for="@media">-webkit-max-device-pixel-ratio</dfn></code></td>
<td><code><a>max-resolution</a></code></td>
</tr>
</tbody>
</table>
<h4 id="css-media-queries-webkit-transform-3d">
<code>'@media/-webkit-transform-3d'</code>
</h4>
<pre class='descdef mq'>
Name: '@media/-webkit-transform-3d'
Value: <<mq-boolean>>
For: @media
Type: discrete
</pre>
The <code>'@media/-webkit-transform-3d'</code> <a>media feature</a> is used to query whether the
user agent supports CSS 3D transforms. [[css-transforms-1]]
If the user agent supports 3D transforms, the value will be 1. Otherwise the value is 0.
<h3 id="css-gradient-fns">CSS Gradient Functions</h3>
<!-- Uncomment if we ever add -webkit-gradient()
Both the [[css3-images-20110217]] draft <code>-webkit-</code> prefixed <<image>> gradient functions
and the 2008 <code>-webkit-gradient()</code> (<a href="https://webkit.org/blog/175/introducing-css-gradients/">blog post</a>, <a href="https://developer.apple.com/library/safari/documentation/InternetWeb/Conceptual/SafariVisualEffectsProgGuide/Gradients/Gradient.html#//apple_ref/doc/uid/TP40008032-CH10-SW34">Safari developer documentation</a>) must be supported for compatibility.
-->
<h4 id="css-gradients-webkit-linear-gradient">
<code>''-webkit-linear-gradient()''</code>
</h4>
The <code><dfn export>-webkit-linear-gradient()</dfn></code> [=gradient function=] must be treated
as an alias of <a>linear-gradient</a> as defined in [[css3-images-20110217]].
<h4 id="css-gradients-webkit-radial-gradient">
<code>''-webkit-radial-gradient()''</code>
</h4>
The <code><dfn export>-webkit-radial-gradient()</dfn></code> [=gradient function=] must be treated
as an alias of <a>radial-gradient</a> as defined in [[css3-images-20110217]].
<h4 id="css-gradients-repeating-webkit-linear-gradient">
<code>''-webkit-repeating-linear-gradient()''</code>
</h4>
The <code><dfn export>-webkit-repeating-linear-gradient()</dfn></code> [=gradient function=] must be
treated as an alias of <a>repeating-linear-gradient</a> as defined in [[css3-images-20110217]].
<h4 id="css-gradients-repeating-webkit-radial-gradient">
<code>''-webkit-repeating-radial-gradient()''</code>
</h4>
The <code><dfn export>-webkit-repeating-radial-gradient()</dfn></code> [=gradient function=] must be
treated as an alias of <a>repeating-radial-gradient</a> as defined in [[css3-images-20110217]].
<!--
<h4 id="css-gradients-webkit-gradient">
<code>-webkit-gradient()</code>
</h4>
<div class="XXX">TODO</div> -->
<h3 id="css-properties">CSS Properties</h3>
<h4 id="css-simple-aliases">Legacy name aliases</h4>
The following <code>-webkit-</code> <a>vendor prefixed</a> properties must be supported as
<a lt="legacy name alias">legacy name aliases</a> of the corresponding unprefixed property:
<table>
<thead>
<tr>
<th><code>-webkit-</code> prefixed property alias</th>
<th>unprefixed property</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><dfn property>-webkit-align-items</dfn></code></td>
<td><code>'align-items'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-align-content</dfn></code></td>
<td><code>'align-content'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-align-self</dfn></code></td>
<td><code>'align-self'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-animation-name</dfn></code></td>
<td><code>'animation-name'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-animation-duration</dfn></code></td>
<td><code>'animation-duration'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-animation-timing-function</dfn></code></td>
<td><code>'animation-timing-function'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-animation-iteration-count</dfn></code></td>
<td><code>'animation-iteration-count'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-animation-direction</dfn></code></td>
<td><code>'animation-direction'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-animation-play-state</dfn></code></td>
<td><code>'animation-play-state'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-animation-delay</dfn></code></td>
<td><code>'animation-delay'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-animation-fill-mode</dfn></code></td>
<td><code>'animation-fill-mode'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-animation</dfn></code></td>
<td><code>'animation'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-backface-visibility</dfn></code></td>
<td><code>'backface-visibility'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-background-clip</dfn></code></td>
<td><code>'background-clip'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-background-origin</dfn></code></td>
<td><code>'background-origin'</code></td>
</tr>
<tr>
<td>
<code><dfn property>-webkit-background-size</dfn></code>
<p class="XXX">
Not really a [=legacy name alias=]. See
<a href="https://github.com/whatwg/compat/issues/28">issue #28</a>.
</p>
</td>
<td><code>'background-size'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-border-bottom-left-radius</dfn></code></td>
<td><code>'border-bottom-left-radius'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-border-bottom-right-radius</dfn></code></td>
<td><code>'border-bottom-right-radius'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-border-top-left-radius</dfn></code></td>
<td><code>'border-top-left-radius'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-border-top-right-radius</dfn></code></td>
<td><code>'border-top-right-radius'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-border-radius</dfn></code></td>
<td><code>'border-radius'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-box-shadow</dfn></code></td>
<td><code>'box-shadow'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-box-sizing</dfn></code></td>
<td><code>'box-sizing'</code></td>
</tr>
<tr>
<td><code><dfn property id="propdef--webkit-flex-propdef">-webkit-flex</dfn></code></td>
<td><code>'flex'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-flex-basis</dfn></code></td>
<td><code>'flex-basis'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-flex-direction</dfn></code></td>
<td><code>'flex-direction'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-flex-flow</dfn></code></td>
<td><code>'flex-flow'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-flex-grow</dfn></code></td>
<td><code>'flex-grow'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-flex-shrink</dfn></code></td>
<td><code>'flex-shrink'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-flex-wrap</dfn></code></td>
<td><code>'flex-wrap'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-filter</dfn></code></td>
<td><code>'filter'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-justify-content</dfn></code></td>
<td><code>'justify-content'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-mask</dfn></code></td>
<td><code>'mask'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-mask-box-image</dfn></code></td>
<td><code>'mask-border'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-mask-box-image-outset</dfn></code></td>
<td><code>'mask-border-outset'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-mask-box-image-repeat</dfn></code></td>
<td><code>'mask-border-repeat'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-mask-box-image-slice</dfn></code></td>
<td><code>'mask-border-slice'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-mask-box-image-source</dfn></code></td>
<td><code>'mask-border-source'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-mask-box-image-width</dfn></code></td>
<td><code>'mask-border-width'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-mask-clip</dfn></code></td>
<td><code>'mask-clip'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-mask-composite</dfn></code></td>
<td><code>'mask-composite'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-mask-image</dfn></code></td>
<td><code>'mask-image'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-mask-origin</dfn></code></td>
<td><code>'mask-origin'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-mask-position</dfn></code></td>
<td><code>'mask-position'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-mask-repeat</dfn></code></td>
<td><code>'mask-repeat'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-mask-size</dfn></code></td>
<td><code>'mask-size'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-order</dfn></code></td>
<td><code>'order'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-perspective</dfn></code></td>
<td><code>'perspective'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-perspective-origin</dfn></code></td>
<td><code>'perspective-origin'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-transform-origin</dfn></code></td>
<td><code>'transform-origin'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-transform-style</dfn></code></td>
<td><code>'transform-style'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-transform</dfn></code></td>
<td><code>'transform'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-transition-delay</dfn></code></td>
<td><code>'transition-delay'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-transition-duration</dfn></code></td>
<td><code>'transition-duration'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-transition-property</dfn></code></td>
<td><code>'transition-property'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-transition-timing-function</dfn></code></td>
<td><code>'transition-timing-function'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-transition</dfn></code></td>
<td><code>'transition'</code></td>
</tr>
</tbody>
</table>
<h4 id="css-prefixed-aliases">Prefixed legacy name aliases</h4>
The following <code>-webkit-</code> <a>vendor prefixed</a> properties must be supported as
<a lt="legacy name alias">legacy name aliases</a> 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.
<table>
<thead>
<tr>
<th><code>-webkit-</code> prefixed property alias</th>
<th>(vendor prefixed) property</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><dfn property>-webkit-text-size-adjust</dfn></code></td>
<td><code>(-prefix-)'text-size-adjust'</code></td>
</tr>
</tbody>
</table>
<div class="example" id="-moz-text-size-adjust-example">
For example, <code>-webkit-text-size-adjust</code> is
<a href="https://searchfox.org/mozilla-central/rev/7d379061bd56251df911728686c378c5820513d8/devtools/shared/css/generated/properties-db.js#2450-2453">
treated as an alias</a> of <code>-moz-text-size-adjust</code> in Firefox.
</div>
Note: As soon as each property is unprefixable it can be defined as a [=legacy name alias=].
<h4 id="css-non-aliased">Non-aliased vendor prefixed properties</h4>
Note: This section used to specify the '-webkit-appearance' property.
This is now defined in
<a href="https://drafts.csswg.org/css-ui/#appearance-switching">CSS Basic User Interface Module</a>.
<h4 id="css-property-mappings">Property mappings</h4>
The following <code>-webkit-</code> <a>vendor prefixed</a> properties must be supported as mappings
to the corresponding unprefixed property:
<table>
<thead>
<tr>
<th><code>-webkit-</code> prefixed property</th>
<th>unprefixed property</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><dfn property>-webkit-box-align</dfn></code></td>
<td><code>'align-items'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-box-flex</dfn></code></td>
<td><code>'flex-grow'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-box-ordinal-group</dfn></code></td>
<td><code>'order'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-box-orient</dfn></code></td>
<td><code>'flex-direction'</code></td>
</tr>
<tr>
<td><code><dfn property>-webkit-box-pack</dfn></code></td>
<td><code>'justify-content'</code></td>
</tr>
</tbody>
</table>
Issue(87): These definitions of <code>-webkit-box-*</code> are known to not be web compatible.
<h4 id="css-keyword-mappings">Keyword mappings</h4>
The following <code>-webkit-</code> <a>vendor prefixed</a> keywords must be supported as mappings to
the corresponding unprefixed keyword:
<table>
<thead>
<tr>
<th><code>-webkit-</code> prefixed keyword</th>
<th>unprefixed property keyword</th>
</tr>
</thead>
<tbody dfn-for="flex">
<tr>
<td><code><dfn value>-webkit-box</dfn></code></td>
<td><code>''flex''</code></td>
</tr>
<tr>
<td><code><dfn value id="valdef-flex--webkit-flex-valdef">-webkit-flex</dfn></code></td>
<td><code>''flex''</code></td>
</tr>
<tr>
<td><code><dfn value>-webkit-inline-box</dfn></code></td>
<td><code>''inline-flex''</code></td>
</tr>
<tr>
<td><code><dfn value>-webkit-inline-flex</dfn></code></td>
<td><code>''inline-flex''</code></td>
</tr>
</tbody>
</table>
Issue(87): These definitions of <code>-webkit-box-*</code> are known to not be web compatible.
<h4 id="text-fill-and-stroking">Text Fill and Stroking</h4>
<h5 id="the-webkit-text-fill-color">Foreground Text Color: the <code>
'-webkit-text-fill-color'</code> property</h5>
<pre class='propdef'>
Name: -webkit-text-fill-color
Value: <<color>>
Initial: ''currentcolor''
Applies to: all elements
Inherited: yes
Computed value: an RGBA color
Percentages: N/A
Media: visual
Animation type: by computed value type
</pre>
The '-webkit-text-fill-color' property defines the foreground [=fill=] color of an element's text
content.
<div class="example" id="example-webkit-text-fill-color">
Here's an example showing <code>'-webkit-text-fill-color'</code> will always determine the
foreground fill color of an element's text.
<pre class="lang-css">
.one {
color: blue;
/* the following can be omitted because it's the initial value:
-webkit-text-fill-color: currentcolor; */
}
.two {
color: red;
-webkit-text-fill-color: blue;
}
</pre>
Elements with the <code>one</code> or <code>two</code> classes will have blue text.
</div>
<h5 id="the-webkit-text-stroke-color">Text Stroke Color: the <code>
'-webkit-text-stroke-color'</code> property</h5>
<pre class='propdef'>
Name: -webkit-text-stroke-color
Value: <<color>>
Initial: ''currentcolor''
Applies to: all elements
Inherited: yes
Computed value: an RGBA color
Percentages: N/A
Media: visual
Animation type: by computed value type
</pre>
The '-webkit-text-stroke-color' property specifies a [=stroke=] color for an element's text.
<h5 id="the-webkit-text-stroke-width">Text Stroke Thickness: the <code>
'-webkit-text-stroke-width'</code> property</h5>
<pre class='propdef'>
Name: -webkit-text-stroke-width
Value: <<line-width>>
Initial: 0
Applies to: all elements
Inherited: yes
Computed value: absolute length
Percentages: N/A
Media: visual
Animation type: discrete
</pre>
The '-webkit-text-stroke-width' property specifies the width of the [=stroke=] drawn at the edge of
each glyph of an element's text. A zero value results in no [=stroke=] being painted. A negative
value is [=invalid=].
<h5 id="the-webkit-text-stroke">Text Stroke Shorthand: the <code>
'-webkit-text-stroke'</code> property</h5>
<pre class='propdef'>
Name: -webkit-text-stroke
Value: <<line-width>> || <<color>>
Initial: See individual properties
Applies to: See individual properties
Inherited: yes
Computed value: See individual properties
Percentages: N/A
Media: visual
Animation type: See individual properties
</pre>
The '-webkit-text-stroke' property is a shorthand property
for the '-webkit-text-stroke-width' and '-webkit-text-stroke-color' properties,
for setting the [=stroke=] width and
[=stroke=] color of an element's text.
<div class="example" id="example-webkit-text-stroke">
Here are two examples showing how to use the longhand and shorthand
<code>'-webkit-text-stroke'</code> properties to achieve white text with a black stroked text
effect.
<pre class="lang-css">
.stroked-text-longhand {
color: #fff;
-webkit-text-stroke-color: #000;
-webkit-text-stroke-width: 1px;
}
.stroked-text-shorthand {
-webkit-text-fill-color: #fff;
-webkit-text-stroke: thin #000;
}
</pre>
The element <pre><p class="stroked-text-longhand">Serious typography</p></pre> would be
rendered as follows:
<img width="381" height="116" src="stroked-text.png" alt="image of stroked text">
</div>
<h3 id="css-property-values">CSS Property values</h3>
<h4 id="touch-action">Additional <code>touch-action</code> values</h4>
This section augments the <a href="https://w3c.github.io/pointerevents/#the-touch-action-css-property">
definition of <code>touch-action</code></a> from [[!pointerevents2]] to
<a href="https://github.com/whatwg/compat/issues/68">add</a> the <code>pinch-zoom</code> value.
<pre class='propdef'>
Name: touch-action
Value: auto | none | [ [ pan-x | pan-left | pan-right ] || [ pan-y | pan-up | pan-down ] || pinch-zoom ] | manipulation
Initial: auto
Applies to: all elements except: non-replaced inline elements, table rows, row groups, table columns, and column groups.
Inherited: no
Computed value: Same as specified value
Percentages: N/A
Media: visual
Animation type: not animatable
</pre>
When specified, the <code>pinch-zoom</code> token enables multi-finger panning and zooming of the
page. For zooming to occur, all fingers must start on an element that has the pinch-zoom behavior
enabled (via one of the <code>pinch-zoom</code>, <code>manipulation</code>, or <code>auto</code>
values on itself or an ancestor).
<div class="note">Scenarios like image carousels which wish to disable only horizontal panning can
use "<code>touch-action: pan-y pinch-zoom</code>"
to avoid disabling zooming unnecessarily.</div>
<code>manipulation</code> is an alias for "<code>pan-x pan-y pinch-zoom</code>".
<h2 id="dom-compat-section">DOM Compatibility</h2>
<h3 id="webkitcssmatrix-interface">The WebKitCSSMatrix interface</h3>
Note: {{WebKitCSSMatrix}} is now defined by the DOM Geometry specification. [[!geometry-1]].
<h3 id="windoworientation-interface">
<a attribute lt="orientation"><code>window.orientation</code></a> API
</h3>
<pre class="idl">
partial interface Window {
readonly attribute short orientation;
attribute EventHandler onorientationchange;
};
partial interface HTMLBodyElement {
attribute EventHandler onorientationchange;
};
</pre>
When getting the <dfn attribute for="Window">orientation</dfn> attribute, the user agent must run
the following steps:
1. Let <var>document</var> be [=this=]'s [=relevant global object=]'s [=associated Document=].
1. Return <var>document</var>'s current <a href="#dfn-window-orientation-angle"><code>window.orientation</code> angle</a>.
Whenever the viewport is drawn at a different angle compared to the device's natural orientation,
the user agent must run the following steps:
1. <a lt="fire an event">Fire an event</a> named
<code><dfn id="event-orientationchange" lt="orientationchange">orientationchange</dfn></code> at the
{{Window}} object of the <a>active document</a>.
User agents implementing the <a attribute lt="orientation"><code>window.orientation</code></a>
attribute and its associated <a>orientationchange</a> event must not expose them on non-Mobile
platforms.
<div class="note">iOS Safari also fires an <code>orientationchange</code> event on the
<code><{body}></code> element, but other implementations do not, suggesting it's not necessary for
compatibility with the web.</div>
<h4 id="dfn-window-orientation-angle">
<a attribute lt="orientation"><code>window.orientation</code></a> angle
</h4>
The possible integer values for the <a attribute lt="orientation"><code>window.orientation</code></a>
angle are: <code>-90</code>, <code>0</code>, <code>90</code>, <code>180</code>. User agents must
support the <code>-90</code>, <code>0</code> and <code>90</code> values and may optionally support
<code>180</code>.
<p class="note">
<code>0</code> represents the natural orientation. <code>-90</code> represents a
rotation 90 degrees clockwise from the natural orientation. <code>90</code> represents a rotation
90 degrees counterclockwise from the natural orientation. <code>180</code> represents a rotation
180 degrees from the natural orientation.
</p>
In order to determine the current <a attribute lt="orientation"><code>window.orientation</code></a>
angle, the user agent must run the following steps:
<ol>
<li>Let |orientationAngle| be the <a>current orientation angle</a>.
<ol>
<li>If |orientationAngle| is less than 180, return |orientationAngle|.
<li>If |orientationAngle| is 180, and the [=user agent=] supports that value, return
|orientationAngle|, else return 0.
<li>If |orientationAngle| is greater than 180, return |orientationAngle| - 360.
</ol>
</li>
</ol>
<h4 id="event-handlers">Event Handlers on {{Window}} objects and <code><{body}></code> elements</h4>
The following are the event handlers and their corresponding event handler event types that must be
supported on all {{Window}} objects and <code><{body}></code> elements as attributes:
<table>
<thead>
<tr>
<th><a>event handler</a></th>
<th><a>event handler event type</a></th>
</tr>
</thead>
<tbody>
<tr>
<td>
<code>{{Window/onorientationchange}}</code>
</td>
<td>
<code><a lt="orientationchange">orientationchange</a></code>
</td>
</tr>
</tbody>
</table>
<h2 id="sa-heuristics-section">Cookie Access Heuristics</h2>
User agents are blocking third-party cookies by default while avoiding user-facing
breakage by removing support for common web patterns, particularly login flows via
third-party identity providers. Browsers should follow the established patterns in
this specification in order to provide short-term cookie access to unbreak these flows.
<h3 id="sa-heuristics-global-data">Global Data</h3>
A <dfn>site pair</dfn> is a [=tuple=] consisting of a [=site=] <dfn for=site pair>third party site</dfn>
and a [=site=] <dfn for=site pair>first party site</dfn>
The user agent holds a <dfn>heuristic grants map</dfn> which is a [=map=] of [=site pairs=] to
[=moments=]. The [=moment=] represents the expiration timestamp of a cookie access grant
for [=third party site=] on [=first party site=].
<h3 id="sa-heuristics-constants">Constants</h3>
The <dfn>popup heuristic grant duration</dfn> is an [=implementation-defined=]
[=duration=] that represents the length of time after the popup heuristic is
triggered that a user agent will store the corresponding popup heuristic grant
in its [=heuristic grants map=].
Note: Most implementations use 30 days as the [=popup heuristic grant duration=].
The <dfn>redirect heuristic grant duration</dfn> is an [=implementation-defined=]
[=duration=] that represents the length of time after the redirect heuristic is
triggered that a user agent will store the corresponding redirect heuristic grant
in its [=heuristic grants map=].
Note: Most implementations use 15 minutes as the [=redirect heuristic grant duration=].
<h3 id="sa-heuristics-access-grant">Cookie Access Grant</h3>
<div algorithm>
To <dfn>grant access for heuristics</dfn> given a [=site=] |site|, [=site=]
|firstPartySite|, [=moment=] |currentWallTime|, and [=duration=] |duration|,
perform the following steps:
1. Let |key| be a [=site pair=] with [=third party site=] set to |site| and
[=first party site=] set to |firstPartySite|.
1. Let |expirationTime| be |duration| after |currentWallTime|.
1. Set [=heuristic grants map=][|key|] to |expirationTime|.
</div>
<h3 id="sa-heuristics-access">Cookie Access Monkey Patch</h3>
Issue: TODO: add monkey patch to network fetch cookie access that reads from [=heuristic grants map=].
<h3 id="sa-heuristics-popup">Popup Heuristic</h3>
Append the following steps to the [[!HTML]]'s <a spec="html">activation notification</a> algorithm:
<div algorithm="user-activation-patch">
1. Run [=detect a popup heuristic=] given <var ignore>document</var>.
</div>
<div algorithm>
To <dfn>detect a popup heuristic</dfn> given a [=Document=] |document|,
perform the following steps:
1. Let |browsingContext| be |document|'s [=Document/browsing context=].
1. If |browsingContext|'s [=browsing context/is popup=] is false, then return.
1. If |browsingContext|'s [=browsing context/opener browsing context=] is null, then return.
1. If |browsingContext|'s [=browsing context/opener origin at creation=] is null, then return.
1. Let |firstPartySite| be the result of running [=obtain a site=] given the |browsingContext|'s
[=browsing context/opener origin at creation=].
1. Let |navigable| be |document|'s [=node navigable=].
1. If |navigable| is null, then return.
1. Let |topDocument| be |navigable|'s [=navigable/top-level traversable=]'s
[=navigable/active document=].
1. Let |origin| be |topDocument|'s [=Document/origin=].
1. If |origin| is an [=opaque origin=] then return.
1. Let |site| be the result of running [=obtain a site=] given |origin|.
1. Let |currentWallTime| be |topDocument|'s [=relevant settings object=]'s
[=environment settings object/current wall time=].
1. [=Grant access for heuristics=] given |site|, |firstPartySite|, |currentWallTime|, and
[=popup heuristic grant duration=].
Issue(amaliev/3pcd-exemption-heuristics#3): TODO: Consider whether to check for third-party iframe initiators.
</div>
<h3 id="sa-heuristics-redirect">Redirect Heuristic</h3>
Insert the following steps at the start of [[!HTML]]'s <a spec="html">load a document</a> algorithm.
<div algorithm="loading-a-document-patch">
1. Run [=detect a redirect heuristic=] given <var ignore>navigationParams</var>'s <var ignore>navigable</var>.
</div>
<div algorithm>
To <dfn>detect a redirect heuristic</dfn> given a [=/navigable=] |navigable|, perform the following
steps:
1. Let |topDocument| be |navigable|'s [=navigable/top-level traversable=]'s
[=navigable/active document=].
1. Let |firstPartyOrigin| be |topDocument|'s [=Document/origin=].
1. If |firstPartyOrigin| is an [=opaque origin=] then return.
1. Let |firstPartySite| be the result of running [=obtain a site=] given |firstPartyOrigin|.
1. Let |bounceTrackingRecord| be |navigable|'s [=navigable/top-level traversable=]'s
[=top-level traversable/bounce tracking record=].
1. Let |currentWallTime| be |topDocument|'s [=relevant settings object=]'s
[=environment settings object/current wall time=].
1. Let |navigatedUrlsSet| be |bounceTrackingRecord|'s [=bounce tracking record/bounce set=].
1. Append |bounceTrackingRecord|'s [=bounce tracking record/initial host=] to |navigatedUrlsSet|.
1. [=list/For each=] |bounceUrl| in |navigatedUrlsSet|:
1. Let |site| be the result of running [=obtain a site=] given |bounceUrl|.
1. If |site| is [=site/same site=] to |firstPartySite|, [=iteration/continue=].
1. If |bounceTrackingRecord|'s [=bounce tracking record/user activation set=] does not contain |site|,
[=iteration/continue=].
<!-- TODO: Check that the user visited |firstPartySite| before |site|, to verify the
[A-B-A flow](https://github.com/amaliev/3pcd-exemption-heuristics/blob/main/explainer.md#scenario-c2).
This will require traversing the navigable's history. -->
1. [=Grant access for heuristics=] given |site|, |firstPartySite|, |currentWallTime|, and
[=redirect heuristic grant duration=].
</div>
<h2 id="ua-string-section">The User-Agent String</h2>
The <code>User-Agent</code> header field syntax is formally defined by [[!HTTP-SEMANTICS]] and
provides SHOULD-level guidance on its value. This section serves as a descriptive record of the
<code>User-Agent</code> patterns found in the so-called major web browsers, but much of it will
apply to other browsers with a shared heritage (i.e., forks and embedders) as well as any
<a>user agent</a> in the more general sense that send a <code>User-Agent</code> <a>header</a>.
<h3 id="ua-string-patterns">User-Agent Tokens</h3>
A User-Agent <dfn>token</dfn> is a string that represents an abstraction over a semantic unit in the
<code>User-Agent</code> string. This document formalizes a <a>token</a> as a <a>string</a> that
begins with an opening bracket "<" and ends with a closing ">" bracket, e.g.,
<code><version></code>. A <a>token</a> may also contain other <a>tokens</a>.
A User-Agent <dfn>constant</dfn> is a <a>string</a> whose value does not change.
When a <a>token</a>'s value is made up from one or more <a>tokens</a>, and optionally