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<h1 class="p-name no-ref" id="title">CSS Snapshot 2021</h1>
<p id="w3c-state"><a href="https://www.w3.org/standards/types#NOTE">W3C Group Note</a>, <time class="dt-updated" datetime="2021-12-31">31 December 2021</time></p>
<details open>
<summary>More details about this document</summary>
<div data-fill-with="spec-metadata">
<dl>
<dt>This version:
<dd><a class="u-url" href="https://www.w3.org/TR/2021/NOTE-css-2021-20211231/">https://www.w3.org/TR/2021/NOTE-css-2021-20211231/</a>
<dt>Latest published version:
<dd><a href="https://www.w3.org/TR/css-2021/">https://www.w3.org/TR/css-2021/</a>
<dt>Editor's Draft:
<dd><a href="https://drafts.csswg.org/css-2021/">https://drafts.csswg.org/css-2021/</a>
<dt>Previous Versions:
<dd><a href="https://www.w3.org/TR/2021/NOTE-css-2021-20211221/" rel="prev">https://www.w3.org/TR/2021/NOTE-css-2021-20211221/</a>
<dt>History:
<dd><a class="u-url" href="https://www.w3.org/standards/history/css-2021">https://www.w3.org/standards/history/css-2021</a>
<dt>Feedback:
<dd><a href="https://github.com/w3c/csswg-drafts/labels/css-2021">CSSWG Issues Repository</a>
<dt class="editor">Editors:
<dd class="editor p-author h-card vcard" data-editor-id="42199"><a class="p-name fn u-url url" href="http://xanthir.com/">Tab Atkins Jr.</a> (<span class="p-org org">Google</span>)
<dd class="editor p-author h-card vcard" data-editor-id="35400"><a class="p-name fn u-url url" href="http://fantasai.inkedblade.net/contact">Elika J. Etemad / fantasai</a> (<span class="p-org org">Invited Expert</span>)
<dd class="editor p-author h-card vcard" data-editor-id="43241"><a class="p-name fn u-url url" href="https://florian.rivoal.net">Florian Rivoal</a> (<span class="p-org org">Invited Expert</span>)
<dt>Suggest an Edit for this Spec:
<dd><a href="https://github.com/w3c/csswg-drafts/blob/main/css-2021/Overview.bs">GitHub Editor</a>
</dl>
</div>
</details>
<div data-fill-with="warning"></div>
<p class="copyright" data-fill-with="copyright"><a href="https://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 2021 <a href="https://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup> (<a href="https://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>, <a href="https://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>, <a href="https://www.keio.ac.jp/">Keio</a>, <a href="https://ev.buaa.edu.cn/">Beihang</a>). W3C <a href="https://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="https://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document" rel="license">permissive document license</a> rules apply. </p>
<hr title="Separator for header">
</div>
<div class="p-summary" data-fill-with="abstract">
<h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>
<p>This document collects together into one definition all the specs that
together form the current state of Cascading Style Sheets (CSS) as of 2021.
The primary audience is CSS implementers, not CSS authors, as this definition
includes modules by specification stability, not Web browser adoption rate.</p>
<a href="https://www.w3.org/TR/CSS/">CSS</a> is a language for describing the rendering of structured documents
(such as HTML and XML)
on screen, on paper, etc.
</div>
<h2 class="no-num no-toc no-ref heading settled" id="sotd"><span class="content">Status of this document</span></h2>
<div data-fill-with="status">
<p><em>This section describes the status of this document at the time of its publication.
A list of current W3C publications
and the latest revision of this technical report
can be found in the <a href="https://www.w3.org/TR/">W3C technical reports index at https://www.w3.org/TR/.</a></em> </p>
<p data-deliverer="32061"> This document was published
by the <a href="https://www.w3.org/groups/wg/css">CSS Working Group</a> as a Group Note
using the <a href="https://www.w3.org/2021/Process-20211102/#recs-and-notes">Note track</a>.
Group Notes are not endorsed by W3C nor its Members. </p>
<p>Please send feedback
by <a href="https://github.com/w3c/csswg-drafts/issues">filing issues in GitHub</a> (preferred),
including the spec code “css-2021” in the title, like this:
“[css-2021] <i>…summary of comment…</i>”.
All issues and comments are <a href="https://lists.w3.org/Archives/Public/public-css-archive/">archived</a>.
Alternately, feedback can be sent to the (<a href="https://lists.w3.org/Archives/Public/www-style/">archived</a>) public mailing list <a href="mailto:www-style@w3.org?Subject=%5Bcss-2021%5D%20PUT%20SUBJECT%20HERE">www-style@w3.org</a>. </p>
<p>This document is governed by the <a href="https://www.w3.org/2021/Process-20211102/" id="w3c_process_revision">2 November 2021 W3C Process Document</a>. </p>
<p>The <a href="https://www.w3.org/Consortium/Patent-Policy-20200915/">15 September 2020 W3C Patent Policy</a> does not carry any licensing requirements or commitments on this document. </p>
<p></p>
<p>This document represents the state of CSS as of 2021.
The CSS Working Group does not expect any further changes to this document:
new snapshots will be published at <a href="https://www.w3.org/TR/CSS/">https://www.w3.org/TR/CSS/</a> as CSS advances.</p>
</div>
<div data-fill-with="at-risk"></div>
<nav data-fill-with="table-of-contents" id="toc">
<h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
<ol class="toc" role="directory">
<li>
<a href="#intro"><span class="secno">1</span> <span class="content">Introduction</span></a>
<ol class="toc">
<li><a href="#w3c-process"><span class="secno">1.1</span> <span class="content"> Background: The W3C Process and CSS</span></a>
</ol>
<li>
<a href="#module-classification"><span class="secno">2</span> <span class="content"> Classification of CSS Specifications</span></a>
<ol class="toc">
<li><a href="#css"><span class="secno">2.1</span> <span class="content">Cascading Style Sheets (CSS) — The Official Definition</span></a>
<li><a href="#fairly-stable"><span class="secno">2.2</span> <span class="content"> Fairly Stable Modules with limited implementation experience</span></a>
<li><a href="#rough-interop"><span class="secno">2.3</span> <span class="content"> Modules with Rough Interoperability</span></a>
<li><a href="#css-levels"><span class="secno">2.4</span> <span class="content"> CSS Levels</span></a>
<li><a href="#profiles"><span class="secno">2.5</span> <span class="content"> CSS Profiles</span></a>
</ol>
<li>
<a href="#responsible"><span class="secno">3</span> <span class="content"> Requirements for Responsible Implementation of CSS</span></a>
<ol class="toc">
<li><a href="#partial"><span class="secno">3.1</span> <span class="content">Partial Implementations</span></a>
<li>
<a href="#future-proofing"><span class="secno">3.2</span> <span class="content">Implementations of Unstable and Proprietary Features</span></a>
<ol class="toc">
<li><a href="#experimental"><span class="secno">3.2.1</span> <span class="content"> Experimentation and Unstable Features</span></a>
<li><a href="#proprietary"><span class="secno">3.2.2</span> <span class="content"> Proprietary and Non-standardized Features</span></a>
<li><a href="#de-facto"><span class="secno">3.2.3</span> <span class="content"> Market Pressure and De Facto Standards</span></a>
</ol>
<li><a href="#testing"><span class="secno">3.3</span> <span class="content">Implementations of CR-level Features</span></a>
</ol>
<li><a href="#CR-exceptions"><span class="secno">4</span> <span class="content"> Safe to Release pre-CR Exceptions</span></a>
<li>
<a href="#indices"><span class="secno">5</span> <span class="content">Indices</span></a>
<ol class="toc">
<li><a href="#terms"><span class="secno">5.1</span> <span class="content">Terms Index</span></a>
<li><a href="#selectors"><span class="secno">5.2</span> <span class="content">Selector Index</span></a>
<li><a href="#at-rules"><span class="secno">5.3</span> <span class="content"> At-Rule Index</span></a>
<li><a href="#properties"><span class="secno">5.4</span> <span class="content">Property Index</span></a>
<li><a href="#values"><span class="secno">5.5</span> <span class="content">Values Index</span></a>
</ol>
<li><a href="#acks"><span class="secno">6</span> <span class="content">Acknowledgements</span></a>
<li>
<a href="#w3c-conformance"><span class="secno"></span> <span class="content"> Conformance</span></a>
<ol class="toc">
<li><a href="#w3c-conventions"><span class="secno"></span> <span class="content"> Document conventions</span></a>
<li><a href="#w3c-conformance-classes"><span class="secno"></span> <span class="content"> Conformance classes</span></a>
<li>
<a href="#w3c-partial"><span class="secno"></span> <span class="content"> Partial implementations</span></a>
<ol class="toc">
<li><a href="#w3c-conform-future-proofing"><span class="secno"></span> <span class="content"> Implementations of Unstable and Proprietary Features</span></a>
</ol>
<li><a href="#w3c-testing"><span class="secno"></span> <span class="content"> Non-experimental implementations</span></a>
</ol>
<li>
<a href="#references"><span class="secno"></span> <span class="content">References</span></a>
<ol class="toc">
<li><a href="#normative"><span class="secno"></span> <span class="content">Normative References</span></a>
<li><a href="#informative"><span class="secno"></span> <span class="content">Informative References</span></a>
</ol>
</ol>
</nav>
<main>
<h2 class="heading settled" data-level="1" id="intro"><span class="secno">1. </span><span class="content">Introduction</span><a class="self-link" href="#intro"></a></h2>
<p>When the first CSS specification was published,
all of CSS was contained in one document that defined CSS Level 1.
CSS Level 2 was defined also by a single, multi-chapter document.
However for CSS beyond Level 2,
the CSS Working Group chose to adopt a modular approach,
where each module defines a part of CSS,
rather than to define a single monolithic specification.
This breaks the specification into more manageable chunks
and allows more immediate, incremental improvement to CSS.</p>
<p>Since different CSS modules are at different levels of stability,
the CSS Working Group has chosen to publish this profile
to define the current scope and state of Cascading Style Sheets as of 2021.</p>
<h3 class="heading settled" data-level="1.1" id="w3c-process"><span class="secno">1.1. </span><span class="content"> Background: The W3C Process and CSS</span><a class="self-link" href="#w3c-process"></a></h3>
<p><em>This section is non-normative.</em></p>
<p>In the <a href="https://www.w3.org/Consortium/Process/">W3C Process</a>,
a Recommendation-track document passes through three levels of stability,
summarized below:</p>
<dl>
<dt>Working Draft (WD)
<dd>
<p>This is the design phase of a W3C spec.
The WG iterates the spec in response to internal and external feedback.</p>
<p>The first official Working Draft is designated the “First Public Working Draft” (FPWD).
In the CSSWG, publishing FPWD indicates that the Working Group as a whole has agreed to work on the module,
roughly as scoped out and proposed in the editors draft.</p>
<p>The transition to the next stage is sometimes called “Last Call Working Draft” (LCWD) phase.
The CSSWG transitions Working Drafts once we have resolved all known issues,
and can make no further progress without feedback from building tests and implementations.</p>
<p>This “Last Call for Comments” sets a deadline for reporting any outstanding issues,
and requires the WG to specially track and address incoming feedback.
The comment-tracking document is the Disposition of Comments (DoC).
It is submitted along with an updated draft for the Directors approval,
to demonstrate wide review and acceptance.</p>
<dt>Candidate Recommendation (CR)
<dd>
This is the testing phase of a W3C spec.
Notably, this phase is about using tests and implementations to test the specification:
it is not about testing the implementations.
This process often reveals more problems with the spec,
and so a Candidate Recommendation will morph over time in response to implementation and testing feedback,
though usually less so than during the design phase (WD).
<p>Demonstration of two correct, independent implementations of each feature is required to exit CR,
so in this phase the WG builds a test suite and generates implementation reports.</p>
<p>The transition to the next stage is “Proposed Recommendation” (PR).
During this phase the W3C Advisory Committee must approve the transition to REC.</p>
<dt>Recommendation (REC)
<dd> This is the completed state of a W3C spec and represents a maintenance phase.
At this point the WG only maintains an errata document
and occasionally publishes an updated edition that incorporates the errata back into the spec.
</dl>
<p>An <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="editors-draft">Editors Draft</dfn> is effectively a live copy of the editors own working copy.
It may or may not reflect Working Group consensus,
and can at times be in a self-inconsistent state.
(Because the publishing process at W3C is time-consuming and onerous,
the <a data-link-type="dfn" href="#editors-draft" id="ref-for-editors-draft">Editors Draft</a> is usually the best (most up-to-date) reference for a spec.
Efforts are currently underway to reduce the friction of publishing,
so that official drafts will be regularly up-to-date
and <span id="ref-for-editors-draft①">Editors Drafts</span> can return to their original function as scratch space.)</p>
<h2 class="heading settled" data-level="2" id="module-classification"><span class="secno">2. </span><span class="content"> Classification of CSS Specifications</span><a class="self-link" href="#module-classification"></a></h2>
<p><strong class="advisement"> A list of all CSS modules, stable and in-progress,
and their statuses
can be found at the <a href="https://www.w3.org/Style/CSS/current-work">CSS Current Work page</a>.</strong></p>
<h3 class="heading settled" data-level="2.1" id="css"><span class="secno">2.1. </span><span class="content">Cascading Style Sheets (CSS) — The Official Definition</span><a class="self-link" href="#css"></a></h3>
<p>This profile includes only specifications that we consider stable <em>and</em> for which we have enough implementation experience that we are sure of that stability.</p>
<p class="note" role="note"><span>Note:</span> This is not intended to be a CSS Desktop Browser Profile:
inclusion in this profile is based on feature stability only
and not on expected use or Web browser adoption.
This profile defines CSS in its most complete form.</p>
<p class="note" role="note"><span>Note:</span> Although we dont anticipate significant changes to the specifications that form this snapshot,
their inclusion does not mean they are frozen.
The Working Group will continue to address problems as they are found in these specs.
Implementers should monitor <a href="https://lists.w3.org/Archives/Public/www-style/">www-style</a> and/or the <a href="https://www.w3.org/blog/CSS">CSS Working Group Blog</a> for any resulting changes, corrections, or clarifications.</p>
<p>As of 2021, <dfn data-dfn-type="dfn" data-export id="cascading-style-sheets-css">Cascading Style Sheets (CSS)<a class="self-link" href="#cascading-style-sheets-css"></a></dfn> is defined by the following
specifications.</p>
<dl>
<dt><a href="https://www.w3.org/TR/CSS2/">CSS Level 2, latest revision</a> (including errata) <a data-link-type="biblio" href="#biblio-css2">[CSS2]</a>
<dd> This defines the core of CSS, parts of which are overridden by later specifications.
We recommend in particular reading <a href="https://www.w3.org/TR/CSS2/intro.html">Chapter 2</a>,
which introduces some of the basic concepts of CSS
and its design principles.
<dt><a href="https://www.w3.org/TR/css-syntax-3/">CSS Syntax Level 3</a> <a data-link-type="biblio" href="#biblio-css-syntax-3">[CSS-SYNTAX-3]</a>
<dd> Replaces CSS2§4.1, CSS2§4.2, CSS2§4.4, and CSS2§G,
redefining how CSS is parsed.
<dt><a href="https://www.w3.org/TR/css-style-attr/">CSS Style Attributes</a> <a data-link-type="biblio" href="#biblio-css-style-attr">[CSS-STYLE-ATTR]</a>
<dd> Defines how CSS declarations can be embedded in markup attributes.
<dt><a href="https://www.w3.org/TR/css3-mediaqueries/">Media Queries Level 3</a> <a data-link-type="biblio" href="#biblio-css3-mediaqueries">[CSS3-MEDIAQUERIES]</a>
<dd> Replaces CSS2§7.3 and expands on the syntax for media-specific styles.
<dt><a href="https://www.w3.org/TR/css-conditional-3/">CSS Conditional Rules Level 3</a> <a data-link-type="biblio" href="#biblio-css-conditional-3">[CSS-CONDITIONAL-3]</a>
<dd> Extends and supersedes CSS2§7.2,
updating the definition of <a class="css" data-link-type="maybe" href="https://www.w3.org/TR/css3-conditional/#at-ruledef-media" id="ref-for-at-ruledef-media">@media</a> rules to allow nesting
and introducing the <a class="css" data-link-type="maybe" href="https://www.w3.org/TR/css3-conditional/#at-ruledef-supports" id="ref-for-at-ruledef-supports">@supports</a> rule for feature-support queries.
<dt><a href="https://www.w3.org/TR/selectors-3/">Selectors Level 3</a> <a data-link-type="biblio" href="#biblio-selectors-3">[SELECTORS-3]</a>
<dd> Replaces CSS2§5 and CSS2§6.4.3, defining an extended range of selectors.
<dt><a href="https://www.w3.org/TR/css-namespaces/">CSS Namespaces</a> <a data-link-type="biblio" href="#biblio-css3-namespace">[CSS3-NAMESPACE]</a>
<dd> Introduces an <span class="css">@namespace</span> rule to allow namespace-prefixed selectors.
<dt><a href="https://www.w3.org/TR/css-cascade-4/">CSS Cascading and Inheritance Level 4</a> <a data-link-type="biblio" href="#biblio-css-cascade-4">[CSS-CASCADE-4]</a>
<dd> Extends and supersedes CSS2§1.4.3 and CSS2§6, as well as <a data-link-type="biblio" href="#biblio-css-cascade-3">[CSS-CASCADE-3]</a>.
Describes how to collate style rules and assign values to all properties on all elements.
By way of cascading and inheritance, values are propagated for all properties on all elements.
<dt><a href="https://www.w3.org/TR/css-values-3/">CSS Values and Units Level 3</a> <a data-link-type="biblio" href="#biblio-css-values-3">[CSS-VALUES-3]</a>
<dd> Extends and supersedes CSS2§1.4.2.1, CSS2§4.3, and CSS2§A.2.13,
defining CSSs property definition syntax
and expanding its set of units.
<dt><a href="https://www.w3.org/TR/css-variables-1/">CSS Custom Properties for Cascading Variables Module Level 1</a> <a data-link-type="biblio" href="#biblio-css-variables-1">[CSS-VARIABLES-1]</a>
<dd> Introduces cascading variables as a new primitive value type that is accepted by all CSS properties,
and custom properties for defining them.
<dt><a href="https://www.w3.org/TR/css-box-3/">CSS Box Model Level 3</a> <a data-link-type="biblio" href="#biblio-css-box-3">[CSS-BOX-3]</a>
<dd> Replaces CSS2§8.1, §8.2, §8.3 (but not §8.3.1), and §8.4.
<dt><a href="https://www.w3.org/TR/css-color-3/">CSS Color Level 3</a> <a data-link-type="biblio" href="#biblio-css-color-3">[CSS-COLOR-3]</a>
<dd> Extends and supersedes CSS2§4.3.6, CSS2§14.1, and CSS2§18.2,
introducing an extended range of color values.
Also introduces the <a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css-color-4/#propdef-opacity" id="ref-for-propdef-opacity">opacity</a> property.
<dt><a href="https://www.w3.org/TR/css-backgrounds-3/">CSS Backgrounds and Borders Level 3</a> <a data-link-type="biblio" href="#biblio-css-backgrounds-3">[CSS-BACKGROUNDS-3]</a>
<dd> Extends and supersedes CSS2§8.5 and CSS2§14.2,
providing more control of backgrounds and borders,
including layered background images,
image borders,
and drop shadows.
<dt><a href="https://www.w3.org/TR/css-images-3/">CSS Images Level 3</a> <a data-link-type="biblio" href="#biblio-css-images-3">[CSS-IMAGES-3]</a>
<dd> Redefines and incorporates the external 2D image value type,
introduces native 2D gradients,
and adds additional controls for replaced element sizing and rendering.
<dt><a href="https://www.w3.org/TR/css-fonts-3/">CSS Fonts Level 3</a> <a data-link-type="biblio" href="#biblio-css-fonts-3">[CSS-FONTS-3]</a>
<dd> Extends and supersedes CSS2§15
and provides more control over font choice and feature selection.
<dt><a href="https://www.w3.org/TR/css-writing-modes-3/">CSS Writing Modes Level 3</a> <a data-link-type="biblio" href="#biblio-css-writing-modes-3">[CSS-WRITING-MODES-3]</a>
<dd> Defines CSS support for various international writing modes,
such as left-to-right (e.g. Latin or Indic),
right-to-left (e.g. Hebrew or Arabic),
bidirectional (e.g. mixed Latin and Arabic) and vertical (e.g. Asian scripts).
Replaces and extends CSS2§8.6 and §9.10.
<dt><a href="https://www.w3.org/TR/css-multicol-1/">CSS Multi-column Layout Level 1</a> <a data-link-type="biblio" href="#biblio-css-multicol-1">[CSS-MULTICOL-1]</a>
<dd> Introduces multi-column flows to CSS layout.
<dt><a href="https://www.w3.org/TR/css-flexbox-1/">CSS Flexible Box Module Level 1</a> <a data-link-type="biblio" href="#biblio-css-flexbox-1">[CSS-FLEXBOX-1]</a>
<dd> Introduces a flexible linear layout model for CSS.
<dt><a href="https://www.w3.org/TR/css-ui-3/">CSS User Interface Module Level 3</a> <a data-link-type="biblio" href="#biblio-css-ui-3">[CSS-UI-3]</a>
<dd> Extends and supersedes CSS2§18.1 and CSS2§18.4,
defining <a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css-ui-3/#propdef-cursor" id="ref-for-propdef-cursor">cursor</a>, <a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css-ui-3/#propdef-outline" id="ref-for-propdef-outline">outline</a>, and several new CSS features that also enhance the user interface.
<dt><a href="https://www.w3.org/TR/css-contain-1/">CSS Containment Module Level 1</a> <a data-link-type="biblio" href="#biblio-css-contain-1">[CSS-CONTAIN-1]</a>
<dd> Introduces the <a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css-contain-1/#propdef-contain" id="ref-for-propdef-contain">contain</a> property,
which enforces the independent CSS processing of an elements subtree
in order to enable heavy optimizations by user agents when used well.
<dt><a href="https://www.w3.org/TR/css-transforms-1/">CSS Transforms Level 1</a> <a data-link-type="biblio" href="#biblio-css-transforms-1">[CSS-TRANSFORMS-1]</a>
<dd> Introduces coordinate-based graphical transformations to CSS.
<dt><a href="https://www.w3.org/TR/compositing-1/">CSS Compositing and Blending Level 1</a> <a data-link-type="biblio" href="#biblio-compositing">[COMPOSITING]</a>
<dd> Defines the compositing and blending of overlaid content
and introduces features to control their modes.
<dt><a href="https://www.w3.org/TR/css-easing-1/">CSS Easing Functions Level 1</a> <a data-link-type="biblio" href="#biblio-css-easing-1">[CSS-EASING-1]</a>.
<dd> Describes a way for authors to define a transformation
that controls the rate of change of some value.
Applied to animations,
such transformations can be used to produce animations
that mimic physical phenomena such as momentum
or to cause the animation to move in discrete steps producing robot-like movement.
<dt><a href="https://www.w3.org/TR/css-counter-styles-3/">CSS Counter Styles Level 3</a> <a data-link-type="biblio" href="#biblio-css-counter-styles-3">[CSS-COUNTER-STYLES-3]</a>
<dd> Introduces the <a class="css" data-link-type="maybe" href="https://www.w3.org/TR/css-counter-styles-3/#at-ruledef-counter-style" id="ref-for-at-ruledef-counter-style">@counter-style</a> rule,
which allows authors to define their own custom counter styles
for use with CSS list-marker and generated-content counters <a data-link-type="biblio" href="#biblio-css-lists-3">[CSS-LISTS-3]</a>.
It also predefines a set of common counter styles,
including the ones present in CSS2 and CSS2.1.
</dl>
<h3 class="heading settled" data-level="2.2" id="fairly-stable"><span class="secno">2.2. </span><span class="content"> Fairly Stable Modules with limited implementation experience</span><a class="self-link" href="#fairly-stable"></a></h3>
<p>The following modules have completed design work,
and are fairly stable,
but have not received much testing and implementation experience yet.
We hope to incorporate them into the <a href="#css">official definition of CSS</a> in a future snapshot.</p>
<dl>
<dt><a href="https://www.w3.org/TR/mediaqueries-4/">Media Queries Level 4</a> <a data-link-type="biblio" href="#biblio-mediaqueries-4">[MEDIAQUERIES-4]</a>
<dd> Extends and supersedes <a data-link-type="biblio" href="#biblio-css3-mediaqueries">[CSS3-MEDIAQUERIES]</a>,
expanding the syntax, deprecating most media types,
and introducing new media features.
<dt><a href="https://www.w3.org/TR/css-color-4/">CSS Color Level 4</a> <a data-link-type="biblio" href="#biblio-css-color-4">[CSS-COLOR-4]</a>
<dd> Extends and supersedes <a data-link-type="biblio" href="#biblio-css-color-3">[CSS-COLOR-3]</a>,
further expanding the range of colors expressible in CSS.
<dt><a href="https://www.w3.org/TR/css-display-3/">CSS Display Module Level 3</a> <a data-link-type="biblio" href="#biblio-css-display-3">[CSS-DISPLAY-3]</a>
<dd> Replaces CSS2§9.1.2, §9.2.1 (but not §9.2.1.1), §9.2.2 (but not §9.2.2.1), §9.2.3, and §9.2.4 (and lays the foundations for replacing §9.7),
defining how the CSS formatting box tree is generated
from the document element tree
and defining the <a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css-display-3/#propdef-display" id="ref-for-propdef-display">display</a> property that controls it.
<dt><a href="https://www.w3.org/TR/css-writing-modes-4/">CSS Writing Modes Level 4</a> <a data-link-type="biblio" href="#biblio-css-writing-modes-4">[CSS-WRITING-MODES-4]</a>
<dd> Extends and supersedes <a data-link-type="biblio" href="#biblio-css-writing-modes-3">[CSS-WRITING-MODES-3]</a>,
adding more options for vertical writing.
<dt><a href="https://www.w3.org/TR/css-break-3/">CSS Fragmentation Module Level 3</a> <a data-link-type="biblio" href="#biblio-css-break-3">[CSS-BREAK-3]</a>
<dd> Describes the fragmentation model that partitions a flow into pages, columns, or regions
and defines properties that control it.
Extends and supersedes CSS2§13.3.
<dt><a href="https://www.w3.org/TR/css-align-3/">CSS Box Alignment Module Level 3</a> <a data-link-type="biblio" href="#biblio-css-align-3">[CSS-ALIGN-3]</a>
<dd> Introduces properties to control the alignment of boxes
within their containers in the various CSS box layout models:
block layout, table layout, flex layout, and grid layout.
<dt><a href="https://www.w3.org/TR/css-shapes-1/">CSS Shapes Module Level 1</a> <a data-link-type="biblio" href="#biblio-css-shapes-1">[CSS-SHAPES-1]</a>
<dd> Extends floats (CSS2§9.5) to effect non-rectangular wrapping shapes.
<dt><a href="https://www.w3.org/TR/css-text-3/">CSS Text Module Level 3</a> <a data-link-type="biblio" href="#biblio-css-text-3">[CSS-TEXT-3]</a>
<dd> Extends and supersedes CSS2§16 excepting §16.2,
defining properties for text manipulation and specifying their processing model.
It covers line breaking, justification and alignment, white space handling, and text transformation.
<dt><a href="https://www.w3.org/TR/css-text-decor-3/">CSS Text Decoration Level 3</a> <a data-link-type="biblio" href="#biblio-css-text-decor-3">[CSS-TEXT-DECOR-3]</a>
<dd> Extends and supersedes CSS2§16.3,
providing more control over text decoration lines
and adding the ability to specify text emphasis marks
and text shadows.
<dt><a href="https://www.w3.org/TR/css-masking-1/">CSS Masking Level 1</a> <a data-link-type="biblio" href="#biblio-css-masking-1">[CSS-MASKING-1]</a>
<dd> Replaces CSS2§11.1.2
and introduces more powerful ways of clipping and masking content.
<dt><a href="https://www.w3.org/TR/css-scroll-snap-1/">CSS Scroll Snap Module Level 1</a> <a data-link-type="biblio" href="#biblio-css-scroll-snap-1">[CSS-SCROLL-SNAP-1]</a>
<dd> Contains features to control panning and scrolling behavior with “snap positions”.
<dt><a href="https://www.w3.org/TR/css-speech-1/">CSS Speech Module Level 1</a> <a data-link-type="biblio" href="#biblio-css-speech-1">[CSS-SPEECH-1]</a>
<dd> Replaces CSS2§A,
overhauling the (non-normative) speech rendering chapter.
<dt><a href="https://www.w3.org/TR/css-scrollbars-1/">CSS Scrollbars Styling Module Level 1</a> <a data-link-type="biblio" href="#biblio-css-scrollbars-1">[CSS-SCROLLBARS-1]</a>
<dd> Defines properties to influence the visual styling of scrollbars,
introducing controls for their color and width.
</dl>
<h3 class="heading settled" data-level="2.3" id="rough-interop"><span class="secno">2.3. </span><span class="content"> Modules with Rough Interoperability</span><a class="self-link" href="#rough-interop"></a></h3>
<p>Although the following modules have been widely deployed with <a data-link-type="dfn" href="#rough-interoperability" id="ref-for-rough-interoperability">rough interoperability</a>,
their details are not fully worked out or sufficiently well-specified
and they need more testing and bugfixing.
We hope to incorporate them into the <a href="#css">official definition of CSS</a> in a future snapshot.</p>
<dl>
<dt><a href="https://www.w3.org/TR/css-transitions-1/">CSS Transitions Level 1</a> <a data-link-type="biblio" href="#biblio-css-transitions-1">[CSS-TRANSITIONS-1]</a> and <a href="https://www.w3.org/TR/css-animations-1/">CSS Animations Level 1</a> <a data-link-type="biblio" href="#biblio-css-animations-1">[CSS-ANIMATIONS-1]</a>.
<dd> Introduces mechanisms for transitioning the computed values of CSS properties over time.
<dt><a href="https://www.w3.org/TR/css-grid-1/">CSS Grid Layout Module Level 1</a> <a data-link-type="biblio" href="#biblio-css-grid-1">[CSS-GRID-1]</a>
<dd> Introduces a two-dimensional grid-based layout system,
optimized for user interface design.
In the grid layout model, the children of a grid container
can be positioned into arbitrary slots in a predefined flexible or fixed-size layout grid.
<dt><a href="https://www.w3.org/TR/css-grid-2/">CSS Grid Layout Module Level 2</a> <a data-link-type="biblio" href="#biblio-css-grid-2">[CSS-GRID-2]</a>
<dd> Extends and supersedes <a data-link-type="biblio" href="#biblio-css-grid-1">[CSS-GRID-1]</a>,
introducing “subgrids” for managing nested markup in a shared grid framework.
<dt><a href="https://www.w3.org/TR/css-will-change-1/">CSS Will Change Level 1</a> <a data-link-type="biblio" href="#biblio-css-will-change-1">[CSS-WILL-CHANGE-1]</a>
<dd> Introduces a performance hint property called <a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css-will-change-1/#propdef-will-change" id="ref-for-propdef-will-change">will-change</a>.
<dt><a href="https://www.w3.org/TR/filter-effects-1/">Filter Effects Module Level 1</a> <a data-link-type="biblio" href="#biblio-filter-effects-1">[FILTER-EFFECTS-1]</a>
<dd> Introduces filter effects as a way of processing an elements rendering before it is displayed in the document.
<dt><a href="https://www.w3.org/TR/css-font-loading/">CSS Font Loading Module Level 3</a> <a data-link-type="biblio" href="#biblio-css-font-loading-3">[CSS-FONT-LOADING-3]</a>
<dd> Introduces events and interfaces used for dynamically loading font resources.
<dt><a href="https://www.w3.org/TR/css-sizing-3/">CSS Box Sizing Level 3</a> <a data-link-type="biblio" href="#biblio-css-sizing-3">[CSS-SIZING-3]</a>
<dd> Overlays and extends CSS§10.,
expanding the value set of the sizing properties,
introducing more precise sizing terminology,
and defining with more precision and detail
various automatic sizing concepts only vaguely defined in CSS2.
<dt><a href="https://www.w3.org/TR/css-transforms-2/">CSS Transforms Level 2</a> <a data-link-type="biblio" href="#biblio-css-transforms-2">[CSS-TRANSFORMS-2]</a>
<dd> Builds upon <a data-link-type="biblio" href="#biblio-css-transforms-1">[CSS-TRANSFORMS-1]</a> to add new transform functions and properties for three-dimensional transforms,
and convenience functions for simple transforms.
<dt><a href="https://www.w3.org/TR/css-lists-3/">CSS Lists and Counters Module Level 3</a> <a data-link-type="biblio" href="#biblio-css-lists-3">[CSS-LISTS-3]</a>
<dd> Contains CSS features related to list counters:
styling them,
positioning them,
and manipulating their value.
<dt><a href="https://www.w3.org/TR/css-logical-1/">CSS Logical Properties and Values Level 1</a> <a data-link-type="biblio" href="#biblio-css-logical-1">[CSS-LOGICAL-1]</a>
<dd> Introduces logical properties and values
that provide the author with the ability to control layout through logical,
rather than physical,
direction and dimension mappings.
Also defines logical properties and values for the features defined in <a data-link-type="biblio" href="#biblio-css2">[CSS2]</a>.
These properties are writing-mode relative equivalents
of their corresponding physical properties.
<dt><a href="https://www.w3.org/TR/css-position-3/">CSS Positioned Layout Module Level 3</a> <a data-link-type="biblio" href="#biblio-css-position-3">[CSS-POSITION-3]</a>
<dd> Contains defines coordinate-based positioning and offsetting schemes of CSS: <a data-link-type="dfn" href="https://www.w3.org/TR/css-position-3/#relative-position" id="ref-for-relative-position">relative positioning</a>, <a data-link-type="dfn" href="https://www.w3.org/TR/css-position-3/#sticky-position" id="ref-for-sticky-position">sticky positioning</a>, <a data-link-type="dfn" href="https://www.w3.org/TR/css-position-3/#absolute-position" id="ref-for-absolute-position">absolute positioning</a>,
and <a data-link-type="dfn" href="https://www.w3.org/TR/css-position-3/#fixed-position" id="ref-for-fixed-position">fixed positioning</a>.
<dt><a href="https://www.w3.org/TR/resize-observer-1/">Resize Observer</a> <a data-link-type="biblio" href="#biblio-resize-observer-1">[RESIZE-OBSERVER-1]</a>
<dd> This specification describes an API for observing changes to elements principal boxs size.
<dt><a href="https://www.w3.org/TR/web-animations-1/">Web Animations</a> <a data-link-type="biblio" href="#biblio-web-animations-1">[WEB-ANIMATIONS-1]</a>
<dd> Defines a model for synchronization and timing of changes to the presentation of a Web page.
Also defines an application programming interface for interacting with this model.
<dt><a href="https://www.w3.org/TR/css-fonts-4/">CSS Fonts Module Level 4</a> <a data-link-type="biblio" href="#biblio-css-fonts-4">[CSS-FONTS-4]</a>
<dd> Extends and supersedes CSS Fonts 3
and provides more control over font choice and feature selection,
including support for OpenType variations.
<dt><a href="https://www.w3.org/TR/css-color-adjust-1/">CSS Color Adjustment Module Level 1</a> <a data-link-type="biblio" href="#biblio-css-color-adjust-1">[CSS-COLOR-ADJUST-1]</a>
<dd> This module introduces a model and controls over automatic color adjustment by the user agent to handle user preferences and device output optimizations.
</dl>
<h3 class="heading settled" data-level="2.4" id="css-levels"><span class="secno">2.4. </span><span class="content"> CSS Levels</span><a class="self-link" href="#css-levels"></a></h3>
<p>Cascading Style Sheets does not have versions in the traditional sense;
instead it has <dfn data-dfn-type="dfn" data-export id="levels">levels<a class="self-link" href="#levels"></a></dfn>. Each level of CSS builds on the previous,
refining definitions and adding features. The feature set of each higher
level is a superset of any lower level, and the behavior allowed for a given
feature in a higher level is a subset of that allowed in the lower levels.
A user agent conforming to a higher level of CSS is thus also conformant to
all lower levels.</p>
<dl>
<dt><dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="css-level-1">CSS Level 1</dfn>
<dd> The CSS Working Group considers the <a href="https://www.w3.org/TR/2008/REC-CSS1-20080411/">CSS1 specification</a> to be
obsolete. <a data-link-type="dfn" href="#css-level-1" id="ref-for-css-level-1">CSS Level 1</a> is defined as all the features defined
in the CSS1 specification (properties, values, at-rules, etc), but using
the syntax and definitions in the <a href="https://www.w3.org/TR/CSS2/">CSS2.1 specification</a>. <a href="https://www.w3.org/TR/css-style-attr/">CSS Style Attributes</a> defines its inclusion in element-specific style attributes.
<dt><dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="css-level-2">CSS Level 2</dfn>
<dd>
Although the <a href="https://www.w3.org/TR/2008/REC-CSS2-20080411/">CSS2 specification</a> is technically a W3C Recommendation, it passed into the Recommendation stage
before the W3C had defined the Candidate Recommendation stage. Over time
implementation experience and further review has brought to light many problems
in the CSS2 specification, so instead of expanding an already <a href="https://www.w3.org/Style/css2-updates/REC-CSS2-19980512-errata.html">unwieldy
errata list</a>, the CSS Working Group chose to define <cite>CSS Level 2
Revision 1</cite> (CSS2.1). In case of any conflict between the two specs
CSS2.1 contains the definitive definition.
<p>Once CSS2.1 became Candidate Recommendation—effectively though not
officially the same level of stability as CSS2—obsoleted the CSS2
Recommendation. Features in CSS2 that were dropped from CSS2.1 should be
considered to be at the Candidate Recommendation stage, but note that many
of these have been or will be pulled into a CSS Level 3 working draft, in
which case that specification will, once it reaches CR, obsolete the
definitions in CSS2.</p>
<p>The <a href="https://www.w3.org/TR/CSS2/">CSS2.1 specification</a> defines <a data-link-type="dfn" href="#css-level-2" id="ref-for-css-level-2">CSS Level 2</a> and the <a href="https://www.w3.org/TR/css-style-attr/">CSS
Style Attributes specification</a> defines its inclusion in
element-specific style attributes.</p>
<dt><dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="css-level-3">CSS Level 3</dfn>
<dd>
<a data-link-type="dfn" href="#css-level-3" id="ref-for-css-level-3">CSS Level 3</a> builds on CSS Level 2 module by module, using the CSS2.1
specification as its core. Each module adds functionality and/or
replaces part of the CSS2.1 specification. The CSS Working Group
intends that the new CSS modules will not contradict the CSS2.1
specification: only that they will add functionality and refine
definitions. As each module is completed, it will be plugged in to
the existing system of CSS2.1 plus previously-completed modules.
<p>From this level on modules are levelled independently: for example
Selectors Level 4 may well be completed before CSS Line Module Level 3.
Modules with no <a data-link-type="dfn" href="#css-level-2" id="ref-for-css-level-2①">CSS Level 2</a> equivalent start at Level 1;
modules that update features that existed in <span id="ref-for-css-level-2②">CSS Level 2</span> start at Level 3.</p>
<dt><dfn data-dfn-type="dfn" data-export id="css-level-4">CSS Level 4<a class="self-link" href="#css-level-4"></a></dfn> and beyond
<dd> There is no CSS Level 4.
Independent modules can reach level 4 or beyond,
but CSS the language no longer has levels.
("CSS Level 3" as a term is used only to differentiate it from the previous monolithic versions.)
</dl>
<h3 class="heading settled" data-level="2.5" id="profiles"><span class="secno">2.5. </span><span class="content"> CSS Profiles</span><a class="self-link" href="#profiles"></a></h3>
<p>Not all implementations will implement all functionality defined in CSS.</p>
<p>In the past, the Working Group published a few Profiles,
which were meant to define the minimal subset of CSS
that various classes of user agents were expected to support.</p>
<p>This effort has been discontinued,
as the Working Group was not finding it effective or useful,
and the profiles previously defined are now unmaintained.</p>
<p class="note" role="note"><span>Note:</span> Partial implementations of CSS, even if that subset is an official profile,
must follow the forward-compatible parsing rules for <a href="#partial">partial implementations</a>.</p>
<h2 class="heading settled" data-level="3" id="responsible"><span class="secno">3. </span><span class="content"> Requirements for Responsible Implementation of CSS</span><a class="self-link" href="#responsible"></a></h2>
<p>The following sections define several conformance requirements
for implementing CSS responsibly,
in a way that promotes interoperability in the present and future.</p>
<h3 class="heading settled" data-level="3.1" id="partial"><span class="secno">3.1. </span><span class="content">Partial Implementations</span><a class="self-link" href="#partial"></a></h3>
<p>So that authors can exploit the forward-compatible parsing rules to assign fallback values, <strong>CSS renderers <em>must</em> treat as invalid
(and <a href="https://www.w3.org/TR/CSS2/conform.html#ignore">ignore as appropriate</a>)
any at-rules, properties, property values, keywords, and other syntactic constructs
for which they have no usable level of support</strong>.
In particular, user agents <em>must not</em> selectively ignore
unsupported property values and honor supported values in a single multi-value property declaration:
if any value is considered invalid (as unsupported values must be),
CSS requires that the entire declaration be ignored.</p>
<h3 class="heading settled" data-level="3.2" id="future-proofing"><span class="secno">3.2. </span><span class="content">Implementations of Unstable and Proprietary Features</span><a class="self-link" href="#future-proofing"></a></h3>
<p>To avoid clashes with future stable CSS features,
the CSSWG recommends the following best practices for the implementation of <a data-link-type="dfn" href="#unstable" id="ref-for-unstable">unstable</a> features and <a data-link-type="dfn" href="#proprietary-extension" id="ref-for-proprietary-extension">proprietary extensions</a> to CSS:</p>
<h4 class="heading settled" data-level="3.2.1" id="experimental"><span class="secno">3.2.1. </span><span class="content"> Experimentation and Unstable Features</span><a class="self-link" href="#experimental"></a></h4>
<p>Implementations of <a data-link-type="dfn" href="#unstable" id="ref-for-unstable①">unstable</a> features
that are described in W3C specifications
but are not interoperable
should not be released broadly for general use;
but may be released for limited, experimental use in controlled environments.</p>
<details class="why">
<summary>Why?</summary>
We want to allow both authors and implementors to experiment with the feature and give feedback,
but prevent authors from relying on them in production websites
and thereby accidentally "locking in" (through content dependence)
certain syntax or behavior that might change later.
</details>
<div class="example" id="example-e5f16ed9"><a class="self-link" href="#example-e5f16ed9"></a> For example,
a UA could release an <a data-link-type="dfn" href="#unstable" id="ref-for-unstable②">unstable</a> features for experimentation
through beta or other testing-stage builds;
behind a hidden configuration flag;
behind a switch enabled only for specific testing partners;
or through some other means of limiting dependent use. </div>
<p>A CSS feature is considered <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="unstable">unstable</dfn> until
its specification has reached the Candidate Recommendation (CR) stage in the W3C process.
In exceptional cases,
the CSSWG may additionally, by an officially-recorded resolution,
add pre-CR features to the set that are considered safe to release for broad use.
See <a href="#CR-exceptions">§4 Safe to Release pre-CR Exceptions</a>.</p>
<p class="note" role="note"><span>Note:</span> Vendors should consult the WG explicitly and not make assumptions on this point,
as a pre-CR spec that hasnt changed in awhile is usually more out-of-date than stable.</p>
<h4 class="heading settled" data-level="3.2.2" id="proprietary"><span class="secno">3.2.2. </span><span class="content"> Proprietary and Non-standardized Features</span><a class="self-link" href="#proprietary"></a></h4>
<p>To avoid clashes with future CSS features,
the CSS2.1 specification reserves a <dfn class="dfn-paneled" data-dfn-type="dfn" data-export data-lt="vendor prefix | vendor-prefixed | prefixed | unprefixed" id="vendor-prefix"><a href="https://www.w3.org/TR/CSS2/syndata.html#vendor-keywords">prefixed syntax</a></dfn> <a data-link-type="biblio" href="#biblio-css2">[CSS2]</a> for proprietary and experimental extensions to CSS.
A CSS feature is a <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="proprietary-extension">proprietary extension</dfn> if it is meant for use
in a closed environment accessible only to a single vendors user agent(s).
A UA should support such <a data-link-type="dfn" href="#proprietary-extension" id="ref-for-proprietary-extension①">proprietary extensions</a> only through a vendor-<a data-link-type="dfn" href="#vendor-prefix" id="ref-for-vendor-prefix">prefixed</a> syntax
and not expose them to open (multi-UA) environments such as the World Wide Web.</p>
<details class="why">
<summary>Why?</summary>
The prefixing requirement allows shipping specialized features in closed environments
without conflicting with future additions to standard CSS.
The restriction on exposure to open systems is to prevent
accidentally causing the public CSS environment
to depend on an unstandardized <a data-link-type="dfn" href="#proprietary-extension" id="ref-for-proprietary-extension②">proprietary extensions</a>.
</details>
<div class="example" id="example-5502e5f5"><a class="self-link" href="#example-5502e5f5"></a> For example,
Firefoxs XUL-based UI, Apples iTunes UI, and Microsofts Universal Windows Platform app
use extensions to CSS implemented by their respective UAs.
So long as these UAs do not allow Web content to access these features,
they do not provide an opportunity for such content
to become dependent on their <a data-link-type="dfn" href="#proprietary-extension" id="ref-for-proprietary-extension③">proprietary extensions</a>. </div>
<p>Even if a feature is intended to eventually be used in the Web,
if it hasnt yet been standardized
it should still not be exposed to the Web.</p>
<h4 class="heading settled" data-level="3.2.3" id="de-facto"><span class="secno">3.2.3. </span><span class="content"> Market Pressure and De Facto Standards</span><a class="self-link" href="#de-facto"></a></h4>
<p>If a feature is <a data-link-type="dfn" href="#unstable" id="ref-for-unstable③">unstable</a> (i.e. the spec has not yet stabilized), but</p>
<ul>
<li data-md>
<p>at least three UAs implement the feature
(<em>or</em> a UA has broken the other rules and shipped for broad use
an <a data-link-type="dfn" href="#unstable" id="ref-for-unstable④">unstable</a> or otherwise non-standard feature in a production release),</p>
<li data-md>
<p><em>and</em> the implementations have rough interoperability,</p>
<li data-md>
<p><em>and</em> the CSS Working Group has recorded consensus
that this feature should exist and be released,</p>
</ul>
<p>implementers may ship that feature <a data-link-type="dfn" href="#vendor-prefix" id="ref-for-vendor-prefix①">unprefixed</a> in broad-release builds. <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="rough-interoperability">Rough interoperability</dfn> is satisfied by a subjective judgment
that even though there may be differences,
the implementations are sufficiently similar
to be used in production websites for a substantial number of use cases.</p>
<p class="note" role="note">Note that the CSSWG must still be consulted to ensure coordination across vendors
and to ensure coherency review by the CSS experts from each vendor.
Note also that <a data-link-type="dfn" href="#rough-interoperability" id="ref-for-rough-interoperability①">rough interoperability</a> still usually means
painful lack of interop in edge (or not-so-edge) cases,
particularly because details have not been ironed out through the standards review process. </p>
<details class="why">
<summary>Why?</summary>
If a feature is sufficiently popular that three or more browsers have implemented it before its finished standardization,
this clause allows releasing the pressure to ship.
Also, if a feature has already escaped into the wild and sites have started depending on it,
pretending its still “experimental” doesnt help anyone.
Allowing others to ship unprefixed recognizes that the feature is now de facto standardized
and encourages authors to write cross-platform code.
</details>
<h5 class="no-toc heading settled" data-level="3.2.3.1" id="unstable-syntax"><span class="secno">3.2.3.1. </span><span class="content"> Vendor-prefixing Unstable Features</span><a class="self-link" href="#unstable-syntax"></a></h5>
<p>When exposing such a standards-track <a data-link-type="dfn" href="#unstable" id="ref-for-unstable⑤">unstable</a> feature to the Web in a production release,
implementations should support <em>both</em> <a data-link-type="dfn" href="#vendor-prefix" id="ref-for-vendor-prefix②">vendor-prefixed</a> and unprefixed syntaxes
for the feature.
Once the feature has stabilized and the implementation is updated to match interoperable behavior,
support for the <span id="ref-for-vendor-prefix③">vendor-prefixed</span> syntax should be removed. </p>
<details class="why">
<summary>Why?</summary>
This is recommended so that authors can use the unprefixed syntax to target all implementations,
but when necessary, can target specific implementations
to work around incompatibilities among implementations
as they get ironed out through the standards/bugfixing process.
<p>The lack of a phase
where only the prefixed syntax is supported
greatly reduces the risk of stylesheets
being written with only the vendor-prefixed syntax.
This in turn allows UA vendors to retire
their prefixed syntax once the feature is stable,
with a lower risk of breaking existing content.
It also reduces the need occasionally felt by some vendors
to support a feature with the prefix of another vendor,
due to content depending on that syntax.</p>
</details>
<p>Anyone promoting <a data-link-type="dfn" href="#unstable" id="ref-for-unstable⑥">unstable</a> features to authors
should document them using their standard unprefixed syntax,
and avoid encouraging the use of the <a data-link-type="dfn" href="#vendor-prefix" id="ref-for-vendor-prefix④">vendor-prefixed</a> syntax
for any purpose other than working around implementation differences.</p>
<h5 class="no-toc heading settled" data-level="3.2.3.2" id="open-technology"><span class="secno">3.2.3.2. </span><span class="content"> Preserving the Openness of CSS</span><a class="self-link" href="#open-technology"></a></h5>
<p>In order to preserve the open nature of CSS as a technology,
vendors should make it possible for other implementors
to freely implement any features that they do ship.
To this end, they should provide spec-editing and testing resources
to complete standardization of such features,
and avoid other obstacles (e.g., platform dependency, licensing restrictions)
to their competitors shipping the feature.</p>
<h3 class="heading settled" data-level="3.3" id="testing"><span class="secno">3.3. </span><span class="content">Implementations of CR-level Features</span><a class="self-link" href="#testing"></a></h3>
<p>Once a specification reaches the Candidate Recommendation stage,
implementers should release an <a data-link-type="dfn" href="#vendor-prefix" id="ref-for-vendor-prefix⑤">unprefixed</a> implementation
of any CR-level feature they can demonstrate
to be correctly implemented according to spec,
and should avoid exposing a prefixed variant of that feature.</p>
<p>To establish and maintain the interoperability of CSS across
implementations, the CSS Working Group requests that non-experimental
CSS renderers submit an implementation report (and, if necessary, the
testcases used for that implementation report) to the W3C before
releasing an unprefixed implementation of any CSS features. Testcases
submitted to W3C are subject to review and correction by the CSS
Working Group.</p>
<p>Further information on submitting testcases and implementation reports
can be found from on the CSS Working Groups website at <a href="https://www.w3.org/Style/CSS/Test/">https://www.w3.org/Style/CSS/Test/</a>.
Questions should be directed to the <a href="https://lists.w3.org/Archives/Public/public-css-testsuite">public-css-testsuite@w3.org</a> mailing list.</p>
<h2 class="heading settled" data-level="4" id="CR-exceptions"><span class="secno">4. </span><span class="content"> Safe to Release pre-CR Exceptions</span><a class="self-link" href="#CR-exceptions"></a></h2>
<p>The following features have been explicitly and proactively cleared
by the CSS Working Group for broad release
prior to the spec reaching Candidate Recommendation.
See <a href="#experimental">§3.2.1 Experimentation and Unstable Features</a>.</p>
<ul>
<li>The flow-relative equivalents of
the sizing properties (<a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css-sizing-3/#propdef-width" id="ref-for-propdef-width">width</a>, <a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css-sizing-3/#propdef-height" id="ref-for-propdef-height">height</a>, etc.),
the border properties,
the margin and padding properties.
See <a href="https://lists.w3.org/Archives/Public/www-style/2015Jul/0040.html">explanation</a> and <a href="https://www.w3.org/TR/css-logical-1/">specification</a>.
<li>The <a class="css" data-link-type="maybe" href="https://www.w3.org/TR/css-sizing-3/#valdef-width-min-content" id="ref-for-valdef-width-min-content">min-content</a> and <a class="css" data-link-type="maybe" href="https://www.w3.org/TR/css-sizing-3/#valdef-width-max-content" id="ref-for-valdef-width-max-content">max-content</a> keywords of the sizing properties.
See <a href="https://lists.w3.org/Archives/Public/www-style/2015Aug/0109.html">decision</a> and <a href="https://www.w3.org/TR/css-sizing-3/#sizing-values">specification</a>.
<li>The <a class="css" data-link-type="maybe" href="https://www.w3.org/TR/css-images-4/#funcdef-conic-gradient" id="ref-for-funcdef-conic-gradient">conic-gradient()</a> gradient notation. See <a href="https://github.com/w3c/csswg-drafts/issues/2383#issuecomment-371340088">decision</a>.
<li>The <a class="css" data-link-type="property" href="https://www.w3.org/TR/css-sizing-4/#propdef-aspect-ratio" id="ref-for-propdef-aspect-ratio">aspect-ratio</a> property. <a data-link-type="biblio" href="#biblio-css-sizing-4">[CSS-SIZING-4]</a>
<li>The <a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css-transforms-2/#propdef-translate" id="ref-for-propdef-translate">translate</a>, <a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css-transforms-2/#propdef-rotate" id="ref-for-propdef-rotate">rotate</a>, and <a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css-transforms-2/#propdef-scale" id="ref-for-propdef-scale">scale</a> properties. <a data-link-type="biblio" href="#biblio-css-transforms-2">[CSS-TRANSFORMS-2]</a>
</ul>
<p>The following features have been explicitly and retroactively cleared
by the CSS Working Group for broad release
prior to the spec reaching Candidate Recommendation:</p>
<ul>
<li>Everything in <a href="https://www.w3.org/TR/css-animations-1/">CSS Animations Level 1</a> and <a href="https://www.w3.org/TR/css-transitions-1/">CSS Transitions Level 1</a>.
<li>The <a class="css" data-link-type="maybe" href="https://www.w3.org/TR/selectors-4/#dir-pseudo" id="ref-for-dir-pseudo">:dir()</a>, <a class="css" data-link-type="maybe" href="https://www.w3.org/TR/selectors-4/#lang-pseudo" id="ref-for-lang-pseudo">:lang()</a>, and <a class="css" data-link-type="maybe" href="https://www.w3.org/TR/selectors-4/#focus-within-pseudo" id="ref-for-focus-within-pseudo">:focus-within</a> pseudo-classes from <a data-link-type="biblio" href="#biblio-selectors-4">[SELECTORS-4]</a>.
</ul>
<h2 class="heading settled" data-level="5" id="indices"><span class="secno">5. </span><span class="content">Indices</span><a class="self-link" href="#indices"></a></h2>
<p><em>These sections are non-normative.</em></p>
<h3 class="heading settled" data-level="5.1" id="terms"><span class="secno">5.1. </span><span class="content">Terms Index</span><a class="self-link" href="#terms"></a></h3>
<div data-link-spec="
css2,
css-syntax-3,
css-style-attr-1,
mediaqueries-3,
mediaqueries-4,
css-conditional-3,
css-namespaces-3,
selectors-3,
css-cascade-4,
css-values-3,
css-color-3,
css-backgrounds-3,
css-images-3,
css-fonts-3,
css-multicol-1,
css-ui-3,
compositing-1,
css-writing-modes-3,
css-writing-modes-4,
css-transitions-1,
css-animations-1,
css-easing-1,
css-flexbox-1,
css-transforms-1,
css-variables-1,
css-text-3,
css-counter-styles-3,
css-masking-1,
css-shapes-1,
css-text-decor-3,
css-will-change-1,
css-speech-1,
css-align-3,
css-grid-1,
filter-effects-1,
css-break-3,
css-contain-1,
css-scroll-snap-1,
css-display-3,
css-font-loading-3" data-link-status="TR">
<ul class="index">
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-weight-numeric-values">100...900 weight values</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#shadow-offset-x">1st &lt;length></a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#2d-matrix">2d matrix</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#shadow-offset-y">2nd &lt;length></a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#shadow-blur-radius">3rd &lt;length [0,∞]></a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#shadow-spread-distance">4th &lt;length></a>
<li><a href="https://drafts.csswg.org/css-values-3/#absolute-length">absolute length</a>
<li><a href="https://drafts.csswg.org/css2/#absolutely-positioned">absolutely positioned element</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#abstract-dimensions">abstract dimensions</a>
<li><a href="https://drafts.csswg.org/css-color-3/#activeborder">activeborder</a>
<li><a href="https://drafts.csswg.org/css-color-3/#activecaption">activecaption</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#active-duration">active duration</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#actual-value">actual value</a>
<li><a href="https://drafts.csswg.org/css2/#actual-value">actual values</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#additive-tuple">additive tuple</a>
<li><a href="https://drafts.csswg.org/css2/#adjoining-margins">adjoining</a>
<li><a href="https://drafts.csswg.org/css2/#adjoining-margins">adjoining margins</a>
<li><a href="https://drafts.csswg.org/css-values-3/#length-advance-measure">advance measure</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#after-change-style">after-change style</a>
<li><a href="https://drafts.csswg.org/css-color-3/#aliceblue">aliceblue</a>
<li><a href="https://drafts.csswg.org/css2/#aligned-subtree">aligned subtree</a>
<li><a href="https://drafts.csswg.org/css-align-3/#alignment-baseline">alignment baseline</a>
<li><a href="https://drafts.csswg.org/css-align-3/#alignment-container">alignment container</a>
<li><a href="https://drafts.csswg.org/css-align-3/#shared-alignment-context">alignment context</a>
<li><a href="https://drafts.csswg.org/css-align-3/#alignment-subject">alignment subject</a>
<li><a href="https://drafts.csswg.org/css2/#all-media-group">'all' media group</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#all-petite-caps">all-petite-caps</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#all-small-caps">all-small-caps</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#alphabetic-baseline">alphabetic baseline</a>
<li><a href="https://drafts.csswg.org/css-images-3/#css-ambiguous-image-url">ambiguous image url</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#anb">an+b</a>
<li><a href="https://drafts.csswg.org/css2/#ancestor">ancestor</a>
<li><a href="https://drafts.csswg.org/css-values-3/#anchor-unit">anchor</a>
<li><a href="https://drafts.csswg.org/css-values-3/#anchor-unit">anchor unit</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascade-origin-animation">animation origin</a>
<li><a href="https://drafts.csswg.org/css-variables-1/#animation-tainted">animation-tainted</a>
<li>
anonymous
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#anonymous">in css-display-3, for CSS</a>
<li><a href="https://drafts.csswg.org/css2/#anonymous">in css2</a>
</ul>
<li><a href="https://drafts.csswg.org/css-display-3/#anonymous">anonymous box</a>
<li><a href="https://drafts.csswg.org/css2/#anonymous-inline-boxes">anonymous inline boxes</a>
<li><a href="https://drafts.csswg.org/css-color-3/#antiquewhite">antiquewhite</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#apply">apply to</a>
<li><a href="https://drafts.csswg.org/css-color-3/#appworkspace">appworkspace</a>
<li>
aqua
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#aqua">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#aqua0">in css-color-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-color-3/#aquamarine">aquamarine</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-two-code-points-are-a-valid-escape">are a valid escape</a>
<li>
as conformance class
<ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#style-sheet">in css-fonts-3</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#style-sheet0">in css-speech-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#aspect-value">aspect value</a>
<li><a href="https://drafts.csswg.org/css2/#at-keyword">at-keyword</a>
<li><a href="https://drafts.csswg.org/css-display-3/#atomic-inline">atomic inline</a>
<li><a href="https://drafts.csswg.org/css-display-3/#atomic-inline">atomic inline box</a>
<li><a href="https://drafts.csswg.org/css2/#atomic-inline-level-boxes">atomic inline-level boxes</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#at-rule">at-rule</a>
<li><a href="https://drafts.csswg.org/css2/#at-rules-dfn">at-rules</a>
<li><a href="https://drafts.csswg.org/css2/#attribute">attribute</a>
<li><a href="https://drafts.csswg.org/css2/#audio-media-group">'audio' media group</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#augmented-grid">augmented grid</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#aural-box-model">aural "box" model</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#aural-box-model">aural box model</a>
<li><a href="https://drafts.csswg.org/css2/#author">author</a>
<li>
authoring tool
<ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#authoring-tool">in css-fonts-3</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#authoring-tool">in css-speech-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascade-origin-author">author origin</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascade-origin-author">author-origin</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#author-presentational-hint-origin">author presentational hint origin</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascade-origin-author">author style sheet</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-kerning-auto-value">auto!!font-kerning</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#automatic-grid-position">automatic column position</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#automatic-grid-position">automatic grid position</a>
<li><a href="https://drafts.csswg.org/css2/#automatic-numbering">automatic numbering</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#auto-placement">automatic placement</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#automatic-grid-position">automatic position</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#automatic-grid-position">automatic row position</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#auto-placement">auto-placement</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#auto-placement-cursor">auto-placement cursor</a>
<li><a href="https://drafts.csswg.org/css-font-loading-3/#available-font-faces">available font faces</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#available-grid-space">available grid space</a>
<li><a href="https://drafts.csswg.org/css-break-3/#avoid-break-values">avoid break values</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#axis-lock">axis-lock</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#axis-value">axis value</a>
<li><a href="https://drafts.csswg.org/css-color-3/#azure">azure</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#backdrop">backdrop</a>
<li><a href="https://drafts.csswg.org/css-color-3/#background">background</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#background-painting-area">background painting area</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#background-positioning-area">background positioning area</a>
<li><a href="https://drafts.csswg.org/css2/#escaped-characters">backslash escapes</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#baseline">baseline</a>
<li><a href="https://drafts.csswg.org/css-align-3/#baseline-alignment">baseline alignment</a>
<li><a href="https://drafts.csswg.org/css-align-3/#baseline-alignment-preference">baseline alignment preference</a>
<li><a href="https://drafts.csswg.org/css-align-3/#baseline-content-alignment">baseline content-alignment</a>
<li><a href="https://drafts.csswg.org/css-align-3/#baseline-self-alignment">baseline self-alignment</a>
<li><a href="https://drafts.csswg.org/css-align-3/#baseline-set">baseline set</a>
<li><a href="https://drafts.csswg.org/css-align-3/#baseline-sharing-group">baseline-sharing group</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#baseline-table">baseline table</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#base-size">base size</a>
<li><a href="https://drafts.csswg.org/css-values-3/#bearing-angle">bearing angle</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#before-change-style">before-change style</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#before-flag">before flag</a>
<li><a href="https://drafts.csswg.org/css-color-3/#beige">beige</a>
<li><a href="https://drafts.csswg.org/css-display-3/#bfc">bfc</a>
<li><a href="https://drafts.csswg.org/css-text-3/#bidi-formatting-characters">bidi formatting characters</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#bidi-isolate">bidi-isolate</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#bidi-isolate">bidi-isolated</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#bidi-isolate">bidi isolation</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#bidi-paragraph">bidi paragraph</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#bidirectionality">bidirectionality</a>
<li><a href="https://drafts.csswg.org/css2/#bidirectionality-bidi">bidirectionality (bidi)</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#bi-orientational">bi-orientational</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#bi-orientational-transform">bi-orientational transform</a>
<li><a href="https://drafts.csswg.org/css-color-3/#bisque">bisque</a>
<li><a href="https://drafts.csswg.org/css2/#bitmap-media-group">'bitmap' media group</a>
<li>
black
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#black">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#black0">in css-color-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-color-3/#blanchedalmond">blanchedalmond</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#paren-block">()-block</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#square-block">[]-block</a>
<li><a href="https://drafts.csswg.org/css-display-3/#block">block</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#curly-block">{}-block</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#block-at-rule">block at-rule</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#block-axis">block axis</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#block-axis">block-axis</a>
<li><a href="https://drafts.csswg.org/css-display-3/#block-box">block box</a>
<li><a href="https://drafts.csswg.org/css2/#block-boxes①">block boxes</a>
<li><a href="https://drafts.csswg.org/css-display-3/#block-container">block container</a>
<li><a href="https://drafts.csswg.org/css-display-3/#block-container">block container box</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#block-dimension">block dimension</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#block-end">block end</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#block-end">block-end</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#block-flow-direction">block flow direction</a>
<li><a href="https://drafts.csswg.org/css-display-3/#block-formatting-context">block formatting context</a>
<li><a href="https://drafts.csswg.org/css-display-3/#block-formatting-context-root">block formatting context root</a>
<li><a href="https://drafts.csswg.org/css-display-3/#blockify">blockification</a>
<li><a href="https://drafts.csswg.org/css-display-3/#blockify">blockify</a>
<li><a href="https://drafts.csswg.org/css-display-3/#block-layout">block layout</a>
<li><a href="https://drafts.csswg.org/css-display-3/#block-level">block-level</a>
<li><a href="https://drafts.csswg.org/css-display-3/#block-level-box">block-level box</a>
<li><a href="https://drafts.csswg.org/css2/#block-level-boxes">block-level boxes</a>
<li><a href="https://drafts.csswg.org/css-display-3/#block-level">block-level content</a>
<li><a href="https://drafts.csswg.org/css2/#block-level">block-level elements</a>
<li><a href="https://drafts.csswg.org/css-text-3/#block-scripts">block scripts</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#block-size">block size</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#block-size">block-size</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#block-start">block start</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#block-start">block-start</a>
<li>
blue
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#blue">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#blue0">in css-color-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-color-3/#blueviolet">blueviolet</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#blur-radius">blur radius</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#bold">bold</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#bolder">bolder</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#boolean-context">boolean context</a>
<li>
border
<ul>
<li><a href="https://www.w3.org/TR/css-speech-1/#border-def">in css-speech-1</a>
<li><a href="https://drafts.csswg.org/css2/#box-border-area">in css2</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#border-box">border box</a>
<li><a href="https://www.w3.org/TR/css-shapes-1/#border-box">border-box</a>
<li><a href="https://drafts.csswg.org/css2/#border-edge">border edge</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#border-image-area">border image area</a>
<li><a href="https://drafts.csswg.org/css2/#box-border-area">border (of a box)</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#border-radii">border radius</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#physical-bottom">bottom</a>
<li><a href="https://drafts.csswg.org/css-display-3/#box">box</a>
<li><a href="https://drafts.csswg.org/css-align-3/#box-alignment-properties">box alignment properties</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#box-corner">box-corner</a>
<li><a href="https://drafts.csswg.org/css-break-3/#box-fragment">box fragment</a>
<li><a href="https://drafts.csswg.org/css-display-3/#box-tree">box tree</a>
<li><a href="https://www.w3.org/TR/css-break-3/#break">break</a>
<li><a href="https://drafts.csswg.org/css-color-3/#brown">brown</a>
<li><a href="https://drafts.csswg.org/css-color-3/#burlywood">burlywood</a>
<li><a href="https://drafts.csswg.org/css-color-3/#buttonface">buttonface</a>
<li><a href="https://drafts.csswg.org/css-color-3/#buttonhighlight">buttonhighlight</a>
<li><a href="https://drafts.csswg.org/css-color-3/#buttonshadow">buttonshadow</a>
<li><a href="https://drafts.csswg.org/css-color-3/#buttontext">buttontext</a>
<li><a href="https://drafts.csswg.org/css-color-3/#cadetblue">cadetblue</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#transition-cancel">cancel</a>
<li><a href="https://drafts.csswg.org/css-values-3/#canonical-unit">canonical unit</a>
<li><a href="https://drafts.csswg.org/css2/#canvas">canvas</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#canvas-background">canvas background</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#canvas-surface">canvas surface</a>
<li><a href="https://drafts.csswg.org/css-color-3/#captiontext">captiontext</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#captures-snap-positions">captures snap positions</a>
<li>
cascade
<ul>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascade">in css-cascade-4</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#cascade-def">in css-speech-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascaded-value">cascaded value</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#origin">cascade origin</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#central-baseline">central baseline</a>
<li>
character
<ul>
<li><a href="https://drafts.csswg.org/css-text-3/#character">in css-text-3</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#character">in css-text-decor-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#character-encoding">character encoding</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#character-map">character map</a>
<li><a href="https://drafts.csswg.org/css2/#charset①">"@charset"</a>
<li><a href="https://drafts.csswg.org/css-color-3/#chartreuse">chartreuse</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-an-ident-sequence">check if three code points would start an ident sequence</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-a-number">check if three code points would start a number</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-two-code-points-are-a-valid-escape">check if two code points are a valid escape</a>
<li><a href="https://drafts.csswg.org/css2/#child">child</a>
<li><a href="https://drafts.csswg.org/selectors-3/#child-combinator">child combinator</a>
<li><a href="https://drafts.csswg.org/css2/#child-selector">child selector</a>
<li><a href="https://drafts.csswg.org/css-text-3/#writing-system-chinese">chinese</a>
<li><a href="https://drafts.csswg.org/css-color-3/#chocolate">chocolate</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#circled-lower-latin">circled-lower-latin</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#clamp-a-grid-area">clamp a grid area</a>
<li><a href="https://drafts.csswg.org/css2/#clearance">clearance</a>
<li><a href="https://www.w3.org/TR/CSS2/visuren.html#clearance">clearance.</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#clipping-path">clipping path</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#clipping-region">clipping region</a>
<li><a href="https://drafts.csswg.org/css-shapes-1/#closest-side">closest-side</a>
<li><a href="https://drafts.csswg.org/css-text-3/#clustered-scripts">clustered scripts</a>
<li><a href="https://drafts.csswg.org/css2/#collapse">collapse</a>
<li><a href="https://drafts.csswg.org/css-display-3/#collapsed">collapsed</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#collapsed-flex-item">collapsed flex item</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#collapsed-gutter">collapsed gutter</a>
<li><a href="https://drafts.csswg.org/css2/#collapsed-margin">collapsed margin</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#collapsed-track">collapsed track</a>
<li><a href="https://drafts.csswg.org/css2/#collapse-through">collapse through</a>
<li><a href="https://drafts.csswg.org/css-text-3/#collapsible-white-space">collapsible white space</a>
<li><a href="https://drafts.csswg.org/css2/#collapsed-margin">collapsing margin</a>
<li><a href="https://drafts.csswg.org/css-images-3/#color-stop">color stop</a>
<li><a href="https://drafts.csswg.org/css-images-3/#color-stop-list">color stop list</a>
<li><a href="https://drafts.csswg.org/css-images-3/#color-transition-hint">color transition hint</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#column-box">column box</a>
<li><a href="https://drafts.csswg.org/css-break-3/#column-break">column break</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#column-gap">column gap</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#column-height">column height</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#column-rule">column rule</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#column-width">column width</a>
<li>
combinators
<ul>
<li><a href="https://drafts.csswg.org/css2/#combinator">in css2</a>
<li><a href="https://drafts.csswg.org/selectors-3/#combinators0">in selectors-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-transitions-1/#transition-combined-duration">combined duration</a>
<li><a href="https://drafts.csswg.org/css2/#comments①">comments</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#common-ligatures">common-ligatures</a>
<li><a href="https://drafts.csswg.org/css-align-3/#compatible-baseline-alignment-preferences">compatible baseline alignment preferences</a>
<li><a href="https://drafts.csswg.org/css-values-3/#compatible-units">compatible units</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#dfn-complete">complete</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#completed-transition">completed transition</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#component-value">component value</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#composite-face">composite face</a>
<li><a href="https://drafts.csswg.org/css-images-3/#computed-image">computed &lt;image></a>
<li><a href="https://drafts.csswg.org/css-grid-1/#computed-track-list">computed track list</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#computed-value">computed value</a>
<li><a href="https://drafts.csswg.org/css2/#computed-value">computed values</a>
<li><a href="https://drafts.csswg.org/css-images-3/#concrete-object-size">concrete object size</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#condensed">condensed</a>
<li><a href="https://drafts.csswg.org/css-conditional-3/#conditional-group-rule">conditional group rule</a>
<li><a href="https://drafts.csswg.org/css2/#conditional-import">conditional import</a>
<li><a href="https://drafts.csswg.org/css-text-3/#conditionally-hang">conditionally hang</a>
<li><a href="https://drafts.csswg.org/css2/#conformance-term">conformance</a>
<li><a href="https://drafts.csswg.org/css2/#consecutive">consecutive</a>
<li><a href="https://drafts.csswg.org/css-images-3/#constraint-rectangle">constraint rectangle</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-component-value">consume a component value</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-declaration">consume a declaration</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-function">consume a function</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-list-of-declarations">consume a list of declarations</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-list-of-rules">consume a list of rules</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-an-at-rule">consume an at-rule</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-an-escaped-code-point">consume an escaped code point</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-an-ident-like-token">consume an ident-like token</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-an-ident-sequence">consume an ident sequence</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-number">consume a number</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-numeric-token">consume a numeric token</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-qualified-rule">consume a qualified rule</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-simple-block">consume a simple block</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-string-token">consume a string token</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-style-blocks-contents">consume a style block's contents</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-token">consume a token</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-url-token">consume a url token</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-comments">consume comments</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-the-next-input-token">consume the next input token</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#consume-the-remnants-of-a-bad-url">consume the remnants of a bad url</a>
<li><a href="https://drafts.csswg.org/css-images-3/#contain-constraint">contain constraint</a>
<li><a href="https://drafts.csswg.org/css-display-3/#containing-block">containing block</a>
<li><a href="https://drafts.csswg.org/css-display-3/#containing-block-chain">containing block chain</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#containing-block-for-all-descendants">containing block for all descendants</a>
<li><a href="https://drafts.csswg.org/css-contain-1/#containment">containment</a>
<li>
content
<ul>
<li><a href="https://www.w3.org/TR/css-speech-1/#content-def">in css-speech-1</a>
<li><a href="https://drafts.csswg.org/css2/#content">in css2</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#box-content-area">content area</a>
<li>
content-based minimum size
<ul>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#content-based-minimum-size">in css-flexbox-1</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#content-based-minimum-size">in css-grid-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#content-box">content box</a>
<li><a href="https://www.w3.org/TR/css-shapes-1/#content-box">content-box</a>
<li><a href="https://drafts.csswg.org/css-align-3/#content-distribute">content distribution</a>
<li><a href="https://drafts.csswg.org/css-align-3/#content-distribution-properties">content-distribution properties</a>
<li><a href="https://drafts.csswg.org/css2/#content-edge">content edge</a>
<li><a href="https://drafts.csswg.org/css2/#content-height">content height</a>
<li>
content language
<ul>
<li><a href="https://drafts.csswg.org/css-text-3/#content-language">in css-text-3</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#content-language">in css-text-decor-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#box-content-area">content (of a box)</a>
<li>
content size suggestion
<ul>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#content-size-suggestion">in css-flexbox-1</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#content-size-suggestion">in css-grid-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#content-width">content width</a>
<li><a href="https://drafts.csswg.org/css-text-3/#content-writing-system">content writing system</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#contextual">contextual</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#continuous-media">continuous media</a>
<li><a href="https://drafts.csswg.org/css2/#continuous-media-group">'continuous' media group</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#convert-a-string-to-a-number">convert a string to a number</a>
<li><a href="https://drafts.csswg.org/css-align-3/#coordinated-self-alignment-preference">coordinated self-alignment preference</a>
<li><a href="https://drafts.csswg.org/css-color-3/#coral">coral</a>
<li><a href="https://drafts.csswg.org/css-color-3/#cornflowerblue">cornflowerblue</a>
<li><a href="https://drafts.csswg.org/css-color-3/#cornsilk">cornsilk</a>
<li><a href="https://drafts.csswg.org/css2/#counters①">counters</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#counter-style">counter style</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#counter-symbol">counter symbol</a>
<li><a href="https://drafts.csswg.org/css-images-3/#cover-constraint">cover constraint</a>
<li><a href="https://drafts.csswg.org/css-color-3/#crimson">crimson</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-axis">cross axis</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-axis">cross-axis</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-axis-baseline">cross-axis baseline set</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-dimension">cross dimension</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-end">cross-end</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-size">cross size</a>
<li><a href="https://www.w3.org/TR/css-flexbox-1/#cross-size">cross-size</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-size-property">cross size property</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-start">cross-start</a>
<li><a href="https://drafts.csswg.org/css-values-3/#css-bracketed-range-notation">css bracketed range notation</a>
<li><a href="https://drafts.csswg.org/css-font-loading-3/#css-connected">css-connected</a>
<li><a href="https://drafts.csswg.org/css-conditional-3/#css-feature-queries">css feature queries</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#cssfontfacerule">cssfontfacerule</a>
<li>
css ident
<ul>
<li><a href="https://www.w3.org/TR/css-values-3/#css-identifier">in css-values-3</a>
<li><a href="https://drafts.csswg.org/css-values-3/#css-css-identifier">in css-values-3, for CSS</a>
</ul>
<li>
css identifier
<ul>
<li><a href="https://www.w3.org/TR/css-values-3/#css-identifier">in css-values-3</a>
<li><a href="https://drafts.csswg.org/css-values-3/#css-css-identifier">in css-values-3, for CSS</a>
</ul>
<li><a href="https://drafts.csswg.org/css-syntax-3/#ident-sequence">css ident sequence</a>
<li><a href="https://drafts.csswg.org/css-namespaces-3/#css-qualified-name">css qualified name</a>
<li><a href="https://drafts.csswg.org/css-values-3/#css-wide-keywords">css-wide keywords</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#cubic-bzier-easing-function">cubic bézier easing function</a>
<li><a href="https://drafts.csswg.org/css-color-3/#currentColor-def">currentcolor</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#current-input-code-point">current input code point</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#current-input-token">current input token</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#current-transformation-matrix">current transformation matrix</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#current-value">current value</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#cursive">cursive</a>
<li><a href="https://drafts.csswg.org/css-text-3/#cursive-script">cursive script</a>
<li><a href="https://drafts.csswg.org/css-variables-1/#custom-property">custom property</a>
<li><a href="https://drafts.csswg.org/css-color-3/#cyan">cyan</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkblue">darkblue</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkcyan">darkcyan</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkgoldenrod">darkgoldenrod</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkgray">darkgray</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkgreen">darkgreen</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkgrey">darkgrey</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkkhaki">darkkhaki</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkmagenta">darkmagenta</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkolivegreen">darkolivegreen</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkorange">darkorange</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkorchid">darkorchid</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkred">darkred</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darksalmon">darksalmon</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkseagreen">darkseagreen</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkslateblue">darkslateblue</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkslategray">darkslategray</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkslategrey">darkslategrey</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkturquoise">darkturquoise</a>
<li><a href="https://drafts.csswg.org/css-color-3/#darkviolet">darkviolet</a>
<li>
declaration
<ul>
<li><a href="https://drafts.csswg.org/css-syntax-3/#declaration">in css-syntax-3, for CSS</a>
<li><a href="https://drafts.csswg.org/css2/#declaration①">in css2</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#declaration-block">declaration block</a>
<li><a href="https://drafts.csswg.org/selectors-3/#declared">declared</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#declared-value">declared value</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-decode-bytes">decode bytes</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#decorating-box">decorating box</a>
<li><a href="https://drafts.csswg.org/css-color-3/#deeppink">deeppink</a>
<li><a href="https://drafts.csswg.org/css-color-3/#deepskyblue">deepskyblue</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#default-face">default face</a>
<li><a href="https://drafts.csswg.org/css-namespaces-3/#default-namespace">default namespace</a>
<li><a href="https://drafts.csswg.org/css-images-3/#default-object-size">default object size</a>
<li><a href="https://drafts.csswg.org/css-images-3/#default-sizing-algorithm">default sizing algorithm</a>
<li><a href="https://drafts.csswg.org/css2/#default-style-sheet">default style sheet</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#definite">definite</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-position">definite column position</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-span">definite column span</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-position">definite grid position</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-span">definite grid span</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-position">definite position</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-position">definite row position</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-span">definite row span</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#definite">definite size</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-span">definite span</a>
<li><a href="https://drafts.csswg.org/css2/#descendant">descendant</a>
<li><a href="https://drafts.csswg.org/css2/#descendant-selectors①">descendant-selectors</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-descriptor">descriptor</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#descriptor_declaration">descriptor_declaration</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-descriptor-declarations">descriptor declarations</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#destination">destination</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#determine-the-fallback-encoding">determine the fallback encoding</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#diagonal-fractions">diagonal-fractions</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#dice">dice</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#digit">digit</a>
<li><a href="https://drafts.csswg.org/css-values-3/#dimension">dimension</a>
<li><a href="https://drafts.csswg.org/css-color-3/#dimgray">dimgray</a>
<li><a href="https://drafts.csswg.org/css-color-3/#dimgrey">dimgrey</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#directional-embedding">directional embedding</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#directional-override">directional override</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#discretionary-ligatures">discretionary-ligatures</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#display-def">display</a>
<li><a href="https://drafts.csswg.org/css-display-3/#display-type">display type</a>
<li><a href="https://drafts.csswg.org/css-align-3/#distributed-alignment">distributed alignment</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#distribute-extra-space">distribute extra space</a>
<li>
document
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#document">in css-backgrounds-3</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#document">in css-speech-1</a>
<li><a href="https://drafts.csswg.org/css-style-attr-1/#document">in css-style-attr-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#doclanguage">document language</a>
<li><a href="https://drafts.csswg.org/css-display-3/#document-order">document order</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#document">documents</a>
<li><a href="https://drafts.csswg.org/css2/#doctree">document tree</a>
<li><a href="https://drafts.csswg.org/css-text-3/#white-space">document white space</a>
<li><a href="https://drafts.csswg.org/css-text-3/#white-space">document white space characters</a>
<li><a href="https://drafts.csswg.org/css-color-3/#dodgerblue">dodgerblue</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#dominant-baseline">dominant baseline</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#easing-function">easing function</a>
<li><a href="https://drafts.csswg.org/css-text-3/#unicode-east-asian-width">east asian width property</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#effective-character-map">effective character map</a>
<li>
element
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#elements">in css-display-3, for CSS</a>
<li><a href="https://drafts.csswg.org/css2/#element">in css2</a>
</ul>
<li><a href="https://drafts.csswg.org/css-display-3/#element-tree">element tree</a>
<li><a href="https://drafts.csswg.org/css2/#empty">empty</a>
<li><a href="https://www.w3.org/TR/css-shapes-1/#empty-float-area">empty float area</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#encapsulation-contexts">encapsulation contexts</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#css-end">end</a>
<li><a href="https://drafts.csswg.org/css-images-3/#ending-point">ending point</a>
<li><a href="https://drafts.csswg.org/css-images-3/#ending-shape">ending shape</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#ending-token">ending token</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#transition-end-time">end time</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#transition-end-value">end value</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#environment-encoding">environment encoding</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#eof-code-point">eof code point</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#escape-codepoint">escaping</a>
<li><a href="https://drafts.csswg.org/css-display-3/#establish-an-independent-formatting-context">establish an independent formatting context</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#establish-an-orthogonal-flow">establish an orthogonal flow</a>
<li><a href="https://drafts.csswg.org/css-display-3/#establish-an-independent-formatting-context">established an independent formatting context</a>
<li><a href="https://drafts.csswg.org/css-display-3/#establish-an-independent-formatting-context">establishes an independent formatting context</a>
<li><a href="https://drafts.csswg.org/css-display-3/#establish-an-independent-formatting-context">establishing an independent formatting context</a>
<li><a href="https://drafts.csswg.org/css2/#exact-matching">exact matching</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#expanded">expanded</a>
<li><a href="https://drafts.csswg.org/css-namespaces-3/#expanded-name">expanded name</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#explicit-grid">explicit grid</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#explicit-grid-track">explicit grid column</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#explicit-grid-properties">explicit grid properties</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#explicit-grid-track">explicit grid row</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#explicit-grid-track">explicit grid track</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#explicitly-assigned-line-name">explicitly-assigned line name</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#extra-condensed">extra-condensed</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#extra-expanded">extra-expanded</a>
<li><a href="https://drafts.csswg.org/css-align-3/#fallback-alignment">fallback alignment</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#false-in-the-negative-range">false in the negative range</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#fantasy">fantasy</a>
<li><a href="https://drafts.csswg.org/css-shapes-1/#farthest-side">farthest-side</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#fetch-an-import">fetch an @import</a>
<li><a href="https://drafts.csswg.org/css2/#fictional-tag-sequence">fictional tag sequence</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-filter-code-points">filter code points</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-filter-code-points">filtered code points</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#filter-primitive">filter primitive</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#filter-primitive-attributes">filter primitive attributes</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#filter-primitive-subregion">filter primitive subregion</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#filter-primitive-tree">filter primitive tree</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#filter-region">filter region</a>
<li><a href="https://drafts.csswg.org/css-font-loading-3/#find-the-matching-font-faces">find the matching font faces</a>
<li><a href="https://drafts.csswg.org/css-font-loading-3/#fire-a-font-load-event">fire a font load event</a>
<li><a href="https://drafts.csswg.org/css-color-3/#firebrick">firebrick</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#first-available-font">first available font</a>
<li><a href="https://drafts.csswg.org/css-align-3/#first-baseline-alignment">first-baseline alignment</a>
<li><a href="https://drafts.csswg.org/css-align-3/#baseline-content-alignment">first-baseline content-alignment</a>
<li><a href="https://drafts.csswg.org/css-align-3/#first-baseline-set">first baselines</a>
<li><a href="https://drafts.csswg.org/css-align-3/#baseline-self-alignment">first-baseline self-alignment</a>
<li><a href="https://drafts.csswg.org/css-align-3/#first-baseline-set">first baseline set</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-axis-baseline">first cross-axis baseline set</a>
<li><a href="https://drafts.csswg.org/selectors-3/#first-formatted-line0">first formatted line</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#main-axis-baseline">first main-axis baseline set</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#first-symbol-value">first symbol value</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#fixed-sizing-function">fixed sizing function</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-base-size">flex base size</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-flex-basis">flex basis</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-container">flex container</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-direction">flex direction</a>
<li>
flex factor
<ul>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-factor">in css-flexbox-1</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-columns-flex-factor">in css-grid-1, for grid-template-columns, grid-template-rows</a>
</ul>
<li><a href="https://drafts.csswg.org/css-grid-1/#flex-factor-sum">flex factor sum</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-formatting-context">flex formatting context</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#flex-fraction">flex fraction</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-flex-grow-factor">flex grow factor</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#flexible">flexible</a>
<li>
flexible length
<ul>
<li><a href="https://www.w3.org/TR/css-flexbox-1/#flexible-length">in css-flexbox-1</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#flexible-length">in css-grid-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-grid-1/#flexible-sizing-function">flexible sizing function</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#flexible-tracks">flexible tracks</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-item">flex item</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-layout">flex layout</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-level">flex-level</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-line">flex line</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-flex-shrink-factor">flex shrink factor</a>
<li><a href="https://drafts.csswg.org/css-shapes-1/#float-area">float area</a>
<li><a href="https://drafts.csswg.org/css2/#float-rules">float rules</a>
<li><a href="https://drafts.csswg.org/css-color-3/#floralwhite">floralwhite</a>
<li><a href="https://drafts.csswg.org/css-display-3/#flow-layout">flow layout</a>
<li><a href="https://drafts.csswg.org/css2/#flow-of-an-element">flow of an element</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#flow-relative">flow-relative</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#flow-relative-direction">flow-relative direction</a>
<li><a href="https://drafts.csswg.org/css2/#focus">focus</a>
<li><a href="https://drafts.csswg.org/css2/#following">following element</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font_face_rule">font_face_rule</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font_face_sym">font_face_sym</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#font-family-def">font-family</a>
<li>
font-kerning
<ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-kerning-auto-value">in css-fonts-3</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-kerning-none-value">in css-fonts-3</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-kerning-normal-value">in css-fonts-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-values-3/#font-relative-length">font-relative lengths</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-size-adjust-none-value">font-size-adjust</a>
<li><a href="https://drafts.csswg.org/css-font-loading-3/#font-source">font source</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-stretch-normal-value">font-stretch</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-style-normal-value">font-style</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-caps-normal-value">font-variant-caps</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-east-asian-normal-value">font-variant-east-asian</a>
<li>
font-variant-ligatures
<ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-ligatures-none-value">in css-fonts-3</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-ligatures-normal-value">in css-fonts-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-numeric-normal-value">font-variant-numeric</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-position-normal-value">font-variant-position</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-weight-normal-value">font-weight</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#footnote">footnote</a>
<li><a href="https://drafts.csswg.org/css-break-3/#forced-break">forced break</a>
<li><a href="https://drafts.csswg.org/css-break-3/#forced-break-values">forced break values</a>
<li><a href="https://drafts.csswg.org/css-text-3/#forced-line-break">forced line break</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#forced-paragraph-break">forced paragraph break</a>
<li><a href="https://drafts.csswg.org/css-color-3/#forestgreen">forestgreen</a>
<li><a href="https://drafts.csswg.org/css-display-3/#formatting-context">formatting context</a>
<li><a href="https://drafts.csswg.org/css2/#formatting-structure">formatting structure</a>
<li><a href="https://drafts.csswg.org/css2/#forward-compatible-parsing">forward-compatible parsing</a>
<li><a href="https://drafts.csswg.org/css-break-3/#fragment">fragment</a>
<li><a href="https://drafts.csswg.org/css-break-3/#fragmentainer">fragmentainer</a>
<li><a href="https://drafts.csswg.org/css-break-3/#fragmentation">fragmentation</a>
<li><a href="https://drafts.csswg.org/css-break-3/#fragmentation-break">fragmentation break</a>
<li><a href="https://drafts.csswg.org/css-break-3/#fragmentation-container">fragmentation container</a>
<li><a href="https://drafts.csswg.org/css-break-3/#fragmentation-context">fragmentation context</a>
<li><a href="https://drafts.csswg.org/css-break-3/#fragmentation-direction">fragmentation direction</a>
<li><a href="https://drafts.csswg.org/css-break-3/#fragmentation-root">fragmentation root</a>
<li><a href="https://drafts.csswg.org/css-break-3/#fragmented-flow">fragmented flow</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#free-space">free space</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#frequency-def">frequency</a>
<li>
fuchsia
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#fuchsia">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#fuchsia0">in css-color-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-text-3/#kana-full-size">full-size</a>
<li><a href="https://drafts.csswg.org/css-text-3/#kana-full-size">full-size kana</a>
<li>
full-width
<ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#full-width">in css-fonts-3</a>
<li><a href="https://drafts.csswg.org/css-text-3/#full-width">in css-text-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#fully-inflexible">fully inflexible</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#function">function</a>
<li><a href="https://drafts.csswg.org/css-values-3/#functional-notation">functional notation</a>
<li><a href="https://drafts.csswg.org/css-color-3/#gainsboro">gainsboro</a>
<li><a href="https://drafts.csswg.org/css-text-3/#unicode-general-category">general category</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#generate-a-counter">generate a counter</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#generate-a-counter">generate a counter representation</a>
<li><a href="https://drafts.csswg.org/css-align-3/#generate-baselines">generate baselines</a>
<li><a href="https://drafts.csswg.org/css2/#generated-content">generated content</a>
<li><a href="https://drafts.csswg.org/css-color-3/#ghostwhite">ghostwhite</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#go">go</a>
<li><a href="https://drafts.csswg.org/css-color-3/#gold">gold</a>
<li><a href="https://drafts.csswg.org/css-color-3/#goldenrod">goldenrod</a>
<li><a href="https://drafts.csswg.org/css-images-3/#gradient-average-color">gradient-average-color</a>
<li><a href="https://drafts.csswg.org/css-images-3/#gradient-box">gradient box</a>
<li><a href="https://drafts.csswg.org/css-images-3/#radial-gradient-gradient-center">gradient center</a>
<li><a href="https://drafts.csswg.org/css-images-3/#gradient-function">gradient function</a>
<li><a href="https://drafts.csswg.org/css-images-3/#gradient-line">gradient line</a>
<li><a href="https://drafts.csswg.org/css-text-3/#grapheme-cluster">grapheme cluster</a>
<li>
gray
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#gray">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#gray0">in css-color-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-color-3/#graytext">graytext</a>
<li>
green
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#green">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#green0">in css-color-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-color-3/#greenyellow">greenyellow</a>
<li><a href="https://drafts.csswg.org/css-color-3/#grey">grey</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid">grid</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-area">grid area</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-cell">grid cell</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-column">grid column</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-line">grid column line</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-container">grid container</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-formatting-context">grid formatting context</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-item">grid item</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-item-placement-algorithm">grid item placement algorithm</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-layout">grid layout</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-level">grid-level</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-line">grid line</a>
<li><a href="https://drafts.csswg.org/css2/#grid-media-group">'grid' media group</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-order">grid-modified document order</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-order">grid order</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-placement">grid placement</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-placement-property">grid-placement property</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-position">grid position</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-row">grid row</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-line">grid row line</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-sizing-algorithm">grid sizing algorithm</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-span">grid span</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-track">grid track</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#growth-limit">growth limit</a>
<li><a href="https://drafts.csswg.org/css-variables-1/#guaranteed-invalid-value">guaranteed-invalid value</a>
<li><a href="https://drafts.csswg.org/css-align-3/#gutter">gutter</a>
<li><a href="https://drafts.csswg.org/css-text-3/#half-width">half-width</a>
<li><a href="https://drafts.csswg.org/css-text-3/#hang">hang</a>
<li><a href="https://drafts.csswg.org/css-text-3/#hanging-glyph">hanging glyph</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#height">height</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#hex-digit">hex digit</a>
<li><a href="https://drafts.csswg.org/css-color-3/#highlight">highlight</a>
<li><a href="https://drafts.csswg.org/css-color-3/#highlighttext">highlighttext</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#historical-ligatures">historical-ligatures</a>
<li><a href="https://drafts.csswg.org/css-color-3/#honeydew">honeydew</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#x-axis">horizontal axis</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#horizontal-block-flow">horizontal block flow</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#horizontal-dimension">horizontal dimension</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#horizontal-offset">horizontal offset</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#horizontal-only">horizontal-only</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#horizontal-script">horizontal script</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#horizontal-typographic-mode">horizontal typographic mode</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#horizontal-writing-mode">horizontal writing mode</a>
<li><a href="https://drafts.csswg.org/css-color-3/#hotpink">hotpink</a>
<li><a href="https://drafts.csswg.org/css-text-3/#hyphenate">hyphenate</a>
<li><a href="https://drafts.csswg.org/css-text-3/#hyphenate">hyphenation</a>
<li><a href="https://drafts.csswg.org/css-text-3/#hyphenation-opportunity">hyphenation opportunity</a>
<li><a href="https://drafts.csswg.org/css2/#hyphen-separated-matching">hyphen-separated matching</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#hypothetical-cross-size">hypothetical cross size</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#hypothetical-fr-size">hypothetical fr size</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#hypothetical-main-size">hypothetical main size</a>
<li>
ident
<ul>
<li><a href="https://www.w3.org/TR/css-values-3/#css-identifier">in css-values-3</a>
<li><a href="https://drafts.csswg.org/css-values-3/#css-css-identifier">in css-values-3, for CSS</a>
</ul>
<li><a href="https://drafts.csswg.org/css-syntax-3/#ident-code-point">ident code point</a>
<li>
identifier
<ul>
<li><a href="https://www.w3.org/TR/css-speech-1/#identifier-def">in css-speech-1</a>
<li><a href="https://www.w3.org/TR/css-values-3/#css-identifier">in css-values-3</a>
<li><a href="https://drafts.csswg.org/css-values-3/#css-css-identifier">in css-values-3, for CSS</a>
</ul>
<li><a href="https://www.w3.org/TR/CSS2/syndata.html#value-def-identifier">identifiers</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#identity-transform-function">identity transform function</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#ident-sequence">ident sequence</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#ident-start-code-point">ident-start code point</a>
<li><a href="https://drafts.csswg.org/css2/#ignore①">ignore</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-ignored">ignored</a>
<li><a href="https://drafts.csswg.org/css2/#ignore-unknown">ignore unknown</a>
<li><a href="https://drafts.csswg.org/css2/#ignore-valid">ignore valid</a>
<li><a href="https://drafts.csswg.org/css2/#illegal">illegal</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#implicit-grid">implicit grid</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#implicit-grid-track">implicit grid column</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#implicit-grid-lines">implicit grid lines</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#implicit-grid-properties">implicit grid properties</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#implicit-grid-track">implicit grid row</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#implicit-grid-track">implicit grid track</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#implicitly-assigned-line-name">implicitly-assigned line name</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#implicitly-named-area">implicitly-named area</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#important">important</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#import-conditions">import conditions</a>
<li><a href="https://drafts.csswg.org/css-color-3/#inactiveborder">inactiveborder</a>
<li><a href="https://drafts.csswg.org/css-color-3/#inactivecaption">inactivecaption</a>
<li><a href="https://drafts.csswg.org/css-color-3/#inactivecaptiontext">inactivecaptiontext</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#definite">indefinite</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#definite">indefinite size</a>
<li><a href="https://drafts.csswg.org/css-display-3/#independent-formatting-context">independent formatting context</a>
<li><a href="https://drafts.csswg.org/css-color-3/#indianred">indianred</a>
<li><a href="https://drafts.csswg.org/css-color-3/#indigo">indigo</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#infinitely-growable">infinitely growable</a>
<li><a href="https://drafts.csswg.org/css-display-3/#in-flow">in flow</a>
<li><a href="https://drafts.csswg.org/css-display-3/#in-flow">in-flow</a>
<li><a href="https://drafts.csswg.org/css-color-3/#infobackground">infobackground</a>
<li><a href="https://drafts.csswg.org/css-color-3/#infotext">infotext</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#inheritance">inherit</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#inheritance">inheritance</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#inherited-property">inherited property</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#inherited-value">inherited value</a>
<li><a href="https://drafts.csswg.org/css-display-3/#initial-containing-block">initial containing block</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#initial-free-space">initial free space</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#initial-representation-for-the-counter-value">initial representation for the counter value</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#initial-value">initial value</a>
<li><a href="https://drafts.csswg.org/css-display-3/#inline">inline</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#inline-axis">inline axis</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#inline-axis">inline-axis</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#inline-base-direction">inline base direction</a>
<li><a href="https://drafts.csswg.org/css-display-3/#inline-block">inline block</a>
<li><a href="https://drafts.csswg.org/css-display-3/#inline-block">inline block box</a>
<li><a href="https://drafts.csswg.org/css-display-3/#inline-box">inline box</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#inline-dimension">inline dimension</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#inline-end">inline end</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#inline-end">inline-end</a>
<li><a href="https://drafts.csswg.org/css-display-3/#inline-formatting-context">inline formatting context</a>
<li><a href="https://drafts.csswg.org/css-display-3/#inline-level">inline-level</a>
<li><a href="https://drafts.csswg.org/css-display-3/#inline-level-box">inline-level box</a>
<li><a href="https://drafts.csswg.org/css2/#inline-level-boxes">inline-level boxes</a>
<li><a href="https://drafts.csswg.org/css-display-3/#inline-level">inline-level content</a>
<li><a href="https://drafts.csswg.org/css2/#inline-level">inline-level elements</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#inline-size">inline size</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#inline-size">inline-size</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#inline-start">inline start</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#inline-start">inline-start</a>
<li><a href="https://drafts.csswg.org/css-display-3/#inlinify">inlinification</a>
<li><a href="https://drafts.csswg.org/css-display-3/#inlinify">inlinify</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#inner-box-shadow">inner box-shadow</a>
<li><a href="https://drafts.csswg.org/css-display-3/#inner-display-type">inner display type</a>
<li><a href="https://drafts.csswg.org/css2/#inner-edge">inner edge</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#input-progress-value">input progress value</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#input-stream">input stream</a>
<li>
integer
<ul>
<li><a href="https://www.w3.org/TR/css-speech-1/#integer-def">in css-speech-1</a>
<li><a href="https://drafts.csswg.org/css-values-3/#integer">in css-values-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#intended-direction">intended direction</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#intended-direction-and-end-position">intended direction and end position</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#intended-end-position">intended end position</a>
<li><a href="https://drafts.csswg.org/css2/#interactive-media-group">'interactive media group</a>
<li><a href="https://drafts.csswg.org/css-display-3/#internal-ruby-box">internal ruby box</a>
<li><a href="https://drafts.csswg.org/css-display-3/#internal-ruby-element">internal ruby element</a>
<li><a href="https://drafts.csswg.org/css-display-3/#internal-table-box">internal table box</a>
<li><a href="https://drafts.csswg.org/css-display-3/#internal-table-element">internal table element</a>
<li>
interpreter
<ul>
<li><a href="https://www.w3.org/TR/css-namespaces-3/#interpreter">in css-namespaces-3</a>
<li><a href="https://drafts.csswg.org/css-style-attr-1/#interpreter">in css-style-attr-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#intrinsic">intrinsic dimensions</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#intrinsic-sizing-function">intrinsic sizing function</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-invalid">invalid</a>
<li><a href="https://drafts.csswg.org/css-variables-1/#invalid-at-computed-value-time">invalid at computed-value time</a>
<li><a href="https://drafts.csswg.org/css-images-3/#invalid-image">invalid image</a>
<li><a href="https://drafts.csswg.org/css-display-3/#invisible">invisible</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#isolated-sequence">isolated sequence</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#bidi-isolate">isolation</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#italic">italic</a>
<li><a href="https://drafts.csswg.org/css-font-loading-3/#fontfaceset-iteration-order">iteration order</a>
<li><a href="https://drafts.csswg.org/css-color-3/#ivory">ivory</a>
<li><a href="https://drafts.csswg.org/css-text-3/#writing-system-japanese">japanese</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#jis04">jis04</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#jis78">jis78</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#jis83">jis83</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#jis90">jis90</a>
<li><a href="https://drafts.csswg.org/css-text-3/#justification-opportunity">justification opportunity</a>
<li><a href="https://drafts.csswg.org/css-values-3/#css-keyword">keyword</a>
<li><a href="https://drafts.csswg.org/css-color-3/#khaki">khaki</a>
<li><a href="https://drafts.csswg.org/css-text-3/#writing-system-known">known</a>
<li><a href="https://drafts.csswg.org/css-text-3/#writing-system-korean">korean</a>
<li><a href="https://drafts.csswg.org/css-align-3/#last-baseline-alignment">last-baseline alignment</a>
<li><a href="https://drafts.csswg.org/css-align-3/#baseline-content-alignment">last-baseline content-alignment</a>
<li><a href="https://drafts.csswg.org/css-align-3/#last-baseline-set">last baselines</a>
<li><a href="https://drafts.csswg.org/css-align-3/#baseline-self-alignment">last-baseline self-alignment</a>
<li><a href="https://drafts.csswg.org/css-align-3/#last-baseline-set">last baseline set</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-axis-baseline">last cross-axis baseline set</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#main-axis-baseline">last main-axis baseline set</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lavender">lavender</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lavenderblush">lavenderblush</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lawngreen">lawngreen</a>
<li><a href="https://drafts.csswg.org/css-contain-1/#laying-out-in-place">laying out in-place</a>
<li><a href="https://drafts.csswg.org/css-contain-1/#layout-containment">layout containment</a>
<li><a href="https://drafts.csswg.org/css-contain-1/#layout-containment-box">layout containment box</a>
<li><a href="https://drafts.csswg.org/css-display-3/#layout-internal">layout-internal</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#physical-left">left</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#leftover-space">leftover space</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#legacy-name-alias">legacy name alias</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#legacy-shorthand">legacy shorthand</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#css-legacy-value-alias">legacy value alias</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lemonchiffon">lemonchiffon</a>
<li>
letter
<ul>
<li><a href="https://drafts.csswg.org/css-syntax-3/#letter">in css-syntax-3</a>
<li><a href="https://drafts.csswg.org/css-text-3/#letter">in css-text-3</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#letter">in css-text-decor-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-color-3/#lightblue">lightblue</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lightcoral">lightcoral</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lightcyan">lightcyan</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#lighter">lighter</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lightgoldenrodyellow">lightgoldenrodyellow</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lightgray">lightgray</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lightgreen">lightgreen</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lightgrey">lightgrey</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lightpink">lightpink</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lightsalmon">lightsalmon</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lightseagreen">lightseagreen</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lightskyblue">lightskyblue</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lightslategray">lightslategray</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lightslategrey">lightslategrey</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#light-source">light source</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lightsteelblue">lightsteelblue</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lightyellow">lightyellow</a>
<li>
lime
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#lime">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#lime0">in css-color-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-color-3/#limegreen">limegreen</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#limited-contribution">limited max-content contribution</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#limited-contribution">limited min-content contribution</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#linear-easing-function">linear easing function</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#linear-easing-function">linear timing function</a>
<li><a href="https://drafts.csswg.org/css2/#line-box">line box</a>
<li>
line break
<ul>
<li><a href="https://www.w3.org/TR/css-break-3/#line-break">in css-break-3</a>
<li><a href="https://drafts.csswg.org/css-text-3/#line-break">in css-text-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-text-3/#line-breaking-process">line breaking</a>
<li><a href="https://drafts.csswg.org/css-text-3/#line-breaking-process">line breaking process</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#line-left">line-left</a>
<li><a href="https://drafts.csswg.org/css-color-3/#linen">linen</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#line-name">line name</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#line-name-set">line name set</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#line-orientation">line orientation</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#line-over">line-over</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#line-relative">line-relative</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#line-relative-direction">line-relative direction</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#line-right">line-right</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#line-under">line-under</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#lining-nums">lining-nums</a>
<li><a href="https://drafts.csswg.org/css2/#list-properties">list properties</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#list-style-image-def">list-style-image</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#list-style-type-def">list-style-type</a>
<li><a href="https://drafts.csswg.org/css-images-3/#loading-image">loading image</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#local-coordinate-system">local coordinate system</a>
<li><a href="https://drafts.csswg.org/css-values-3/#url-local-url-flag">local url flag</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#logical-height">logical height</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#logical-width">logical width</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#longhand">longhand</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#longhand">longhand property</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#lowercase-letter">lowercase letter</a>
<li><a href="https://drafts.csswg.org/css-color-3/#magenta">magenta</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#main-axis">main axis</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#main-axis">main-axis</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#main-axis-baseline">main-axis baseline set</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#main-dimension">main dimension</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#main-end">main-end</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#main-size">main size</a>
<li><a href="https://www.w3.org/TR/css-flexbox-1/#main-size">main-size</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#main-size-property">main size property</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#main-start">main-start</a>
<li><a href="https://drafts.csswg.org/css2/#map-document-language-elements-to-table-elements">map document language elements to table elements</a>
<li>
margin
<ul>
<li><a href="https://www.w3.org/TR/css-speech-1/#margin-def">in css-speech-1</a>
<li><a href="https://drafts.csswg.org/css2/#box-margin-area">in css2</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#margin-box">margin box</a>
<li><a href="https://www.w3.org/TR/css-shapes-1/#margin-box">margin-box</a>
<li><a href="https://drafts.csswg.org/css2/#margin-edge">margin edge</a>
<li><a href="https://drafts.csswg.org/css2/#box-margin-area">margin (of a box)</a>
<li>
maroon
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#maroon">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#maroon0">in css-color-3</a>
</ul>
<li><a href="https://drafts.fxtf.org/css-masking-1/#mask-border-image">mask border image</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#mask-border-image-area">mask border image area</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#mask-image">mask image</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#mask-layer-image">mask layer image</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#mask-painting-area">mask painting area</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#mask-position">mask-position</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#mask-positioning-area">mask positioning area</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#mask-size">mask-size</a>
<li><a href="https://www.w3.org/TR/CSS2/selector.html#x1">matches</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#matching-transition-delay">matching transition delay</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#matching-transition-duration">matching transition duration</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#matching-transition-property-value">matching transition-property value</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#matching-transition-timing-function">matching transition timing function</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#max-cross-size">max cross size</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#max-cross-size-property">max cross size property</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#maximum-allowed-code-point">maximum allowed code point</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#max-inner-height">max inner height</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#max-inner-width">max inner width</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#max-main-size">max main size</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#max-main-size-property">max main size property</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#max-track-sizing-function">max track sizing function</a>
<li><a href="https://drafts.csswg.org/css2/#may">may</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#media-condition">media condition</a>
<li><a href="https://drafts.csswg.org/css2/#conditional-import">media-dependent import</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#media-feature">media feature</a>
<li><a href="https://drafts.csswg.org/css2/#media-groups①">media groups</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#media-query">media query</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#media-query-list">media query list</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#media-query-modifier">media query modifier</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#media-type">media type</a>
<li><a href="https://drafts.csswg.org/css-color-3/#mediumaquamarine">mediumaquamarine</a>
<li><a href="https://drafts.csswg.org/css-color-3/#mediumblue">mediumblue</a>
<li><a href="https://drafts.csswg.org/css-color-3/#mediumorchid">mediumorchid</a>
<li><a href="https://drafts.csswg.org/css-color-3/#mediumpurple">mediumpurple</a>
<li><a href="https://drafts.csswg.org/css-color-3/#mediumseagreen">mediumseagreen</a>
<li><a href="https://drafts.csswg.org/css-color-3/#mediumslateblue">mediumslateblue</a>
<li><a href="https://drafts.csswg.org/css-color-3/#mediumspringgreen">mediumspringgreen</a>
<li><a href="https://drafts.csswg.org/css-color-3/#mediumturquoise">mediumturquoise</a>
<li><a href="https://drafts.csswg.org/css-color-3/#mediumvioletred">mediumvioletred</a>
<li><a href="https://drafts.csswg.org/css-color-3/#menu">menu</a>
<li><a href="https://drafts.csswg.org/css-color-3/#menutext">menutext</a>
<li><a href="https://drafts.csswg.org/css-color-3/#midnightblue">midnightblue</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#min-cross-size">min cross size</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#min-cross-size-property">min cross size property</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#minimum-contribution">minimum contribution</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#min-inner-height">min inner height</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#min-inner-width">min inner width</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#min-main-size">min main size</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#min-main-size-property">min main size property</a>
<li><a href="https://drafts.csswg.org/css-color-3/#mintcream">mintcream</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#min-track-sizing-function">min track sizing function</a>
<li><a href="https://drafts.csswg.org/css-color-3/#mistyrose">mistyrose</a>
<li><a href="https://drafts.csswg.org/css-color-3/#moccasin">moccasin</a>
<li><a href="https://drafts.csswg.org/css-break-3/#monolithic">monolithic</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#monospace">monospace</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#multi-column-container">multicol container</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#multi-column-line">multi-col line</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#multi-column-line">multicol line</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#multi-column-container">multi-column container</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#multi-column-formatting-context">multi-column formatting context</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#multi-column-layout">multi-column layout</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#multi-column-line">multi-column line</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#multi-line-flex-container">multi-line flex container</a>
<li><a href="https://drafts.csswg.org/css2/#multiple-declarations">multiple declarations</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#multiply">multiply</a>
<li><a href="https://drafts.csswg.org/css2/#must">must</a>
<li><a href="https://drafts.csswg.org/css2/#must-not">must not</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-areas-named-cell-token">named cell token</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#named-grid-area">named grid area</a>
<li><a href="https://drafts.csswg.org/css-namespaces-3/#namespace-prefix">namespace prefix</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#ident-start-code-point">name-start code point</a>
<li><a href="https://drafts.csswg.org/css-images-3/#natural-aspect-ratio">natural aspect ratio</a>
<li><a href="https://drafts.csswg.org/css-images-3/#natural-dimensions">natural dimension</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#natural-end-point">natural end-point</a>
<li><a href="https://drafts.csswg.org/css-images-3/#natural-height">natural height</a>
<li><a href="https://drafts.csswg.org/css-images-3/#natural-size">natural size</a>
<li><a href="https://drafts.csswg.org/css-images-3/#natural-width">natural width</a>
<li><a href="https://drafts.csswg.org/css-color-3/#navajowhite">navajowhite</a>
<li>
navy
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#navy">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#navy0">in css-color-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-syntax-3/#newline">newline</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#next-input-code-point">next input code point</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#next-input-token">next input token</a>
<li><a href="https://drafts.csswg.org/selectors-3/#next-sibling-combinator">next-sibling combinator</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#no-common-ligatures">no-common-ligatures</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#no-contextual">no-contextual</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#no-discretionary-ligatures">no-discretionary-ligatures</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#no-historical-ligatures">no-historical-ligatures</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#non-ascii-code-point">non-ascii code point</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-kerning-none-value">none!!font-kerning</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-size-adjust-none-value">none!!font-size-adjust</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-ligatures-none-value">none!!font-variant-ligatures</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#non-negative-number-def">non-negative-number</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#non-printable-code-point">non-printable code point</a>
<li><a href="https://drafts.csswg.org/css-display-3/#non-replaced">non-replaced</a>
<li><a href="https://drafts.csswg.org/css-display-3/#non-replaced">non-replaced element</a>
<li><a href="https://www.w3.org/TR/css-font-loading-3/#no-pending-font-loads">no pending font loads</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#normal">normal</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-kerning-normal-value">normal!!font-kerning</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-stretch-normal-value">normal!!font-stretch</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-style-normal-value">normal!!font-style</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-caps-normal-value">normal!!font-variant-caps</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-east-asian-normal-value">normal!!font-variant-east-asian</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-ligatures-normal-value">normal!!font-variant-ligatures</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-numeric-normal-value">normal!!font-variant-numeric</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-position-normal-value">normal!!font-variant-position</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-weight-normal-value">normal!!font-weight</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#normalize-into-a-token-stream">normalize into a token stream</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-areas-null-cell-token">null cell token</a>
<li>
number
<ul>
<li><a href="https://www.w3.org/TR/css-speech-1/#number-def">in css-speech-1</a>
<li><a href="https://drafts.csswg.org/css-values-3/#number">in css-values-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-values-3/#numeric-data-types">numeric data types</a>
<li><a href="https://drafts.csswg.org/css-images-3/#objects">objects</a>
<li><a href="https://drafts.csswg.org/css-images-3/#object-size-negotiation">object size negotiation</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#oblique">oblique</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#occupied">occupied</a>
<li><a href="https://drafts.csswg.org/css-color-3/#oldlace">oldlace</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#oldstyle-nums">oldstyle-nums</a>
<li>
olive
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#olive">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#olive0">in css-color-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-color-3/#olivedrab">olivedrab</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#operating-coordinate-space">operating coordinate space</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#optimal-viewing-region">optimal viewing region</a>
<li><a href="https://drafts.csswg.org/css2/#optional">optional</a>
<li><a href="https://drafts.csswg.org/css-color-3/#orange">orange</a>
<li><a href="https://drafts.csswg.org/css-color-3/#orangered">orangered</a>
<li><a href="https://drafts.csswg.org/css-color-3/#orchid">orchid</a>
<li>
order-modified document order
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#order-modified-document-order">in css-display-3</a>
<li><a href="https://www.w3.org/TR/css-flexbox-1/#order-modified-document-order">in css-flexbox-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#ordinal">ordinal</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#establish-an-orthogonal-flow">orthogonal</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#establish-an-orthogonal-flow">orthogonal flow</a>
<li><a href="https://drafts.csswg.org/css-text-3/#other-space-separators">other space separators</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#outer-box-shadow">outer box-shadow</a>
<li><a href="https://drafts.csswg.org/css-display-3/#outer-display-type">outer display type</a>
<li><a href="https://drafts.csswg.org/css2/#outer-edge">outer edge</a>
<li><a href="https://drafts.csswg.org/css-display-3/#out-of-flow">out of flow</a>
<li><a href="https://drafts.csswg.org/css-display-3/#out-of-flow">out-of-flow</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#output-of-the-cascade">output of the cascade</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#output-progress-value">output progress value</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#over">over</a>
<li><a href="https://drafts.csswg.org/css2/#overflow">overflow</a>
<li><a href="https://drafts.csswg.org/css-align-3/#overflow-alignment">overflow alignment</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#overflow-columns">overflow columns</a>
<li>
padding
<ul>
<li><a href="https://www.w3.org/TR/css-speech-1/#padding-def">in css-speech-1</a>
<li><a href="https://drafts.csswg.org/css2/#box-padding-area">in css2</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#padding-box">padding box</a>
<li><a href="https://www.w3.org/TR/css-shapes-1/#padding-box">padding-box</a>
<li><a href="https://drafts.csswg.org/css2/#padding-edge">padding edge</a>
<li><a href="https://drafts.csswg.org/css2/#box-padding-area">padding (of a box)</a>
<li><a href="https://drafts.csswg.org/css2/#page-area">page area</a>
<li><a href="https://drafts.csswg.org/css2/#page-box①">page box</a>
<li><a href="https://drafts.csswg.org/css-break-3/#page-break">page break</a>
<li><a href="https://drafts.csswg.org/css2/#page-context">page context</a>
<li><a href="https://drafts.csswg.org/css2/#page-context">page-context</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#paged-media">paged media</a>
<li><a href="https://drafts.csswg.org/css2/#paged-media-group">'paged' media group</a>
<li><a href="https://drafts.csswg.org/css2/#page-selector">page selector</a>
<li><a href="https://drafts.csswg.org/css-break-3/#pagination">pagination</a>
<li><a href="https://drafts.csswg.org/css-contain-1/#paint-containment">paint containment</a>
<li><a href="https://drafts.csswg.org/css-contain-1/#paint-containment-box">paint containment box</a>
<li><a href="https://drafts.csswg.org/css-color-3/#palegoldenrod">palegoldenrod</a>
<li><a href="https://drafts.csswg.org/css-color-3/#palegreen">palegreen</a>
<li><a href="https://drafts.csswg.org/css-color-3/#paleturquoise">paleturquoise</a>
<li><a href="https://drafts.csswg.org/css-color-3/#palevioletred">palevioletred</a>
<li><a href="https://drafts.csswg.org/css-color-3/#papayawhip">papayawhip</a>
<li><a href="https://drafts.csswg.org/css2/#parent">parent</a>
<li><a href="https://drafts.csswg.org/css-display-3/#css-parent-box">parent box</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-parse-something-according-to-a-css-grammar">parse</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-parse-a-comma-separated-list-according-to-a-css-grammar">parse a comma-separated list according to a css grammar</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-comma-separated-list-of-component-values">parse a comma-separated list of component values</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-component-value">parse a component value</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-css-stylesheet">parse a css stylesheet</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-declaration">parse a declaration</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-parse-a-comma-separated-list-according-to-a-css-grammar">parse a list</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-list-of-component-values">parse a list of component values</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-list-of-declarations">parse a list of declarations</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-list-of-rules">parse a list of rules</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-rule">parse a rule</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-style-blocks-contents">parse a style block's contents</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-stylesheet">parse a stylesheet</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#parse-error">parse error</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-parse-something-according-to-a-css-grammar">parse something according to a css grammar</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-parse-a-comma-separated-list-according-to-a-css-grammar">parsing a list</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#baseline-participation">participates in baseline alignment</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#pass-through-filter">pass through filter</a>
<li><a href="https://drafts.csswg.org/css-color-3/#peachpuff">peachpuff</a>
<li><a href="https://drafts.csswg.org/css-font-loading-3/#fontfaceset-pending-on-the-environment">pending on the environment</a>
<li><a href="https://drafts.csswg.org/css-variables-1/#pending-substitution-value">pending-substitution value</a>
<li>
percentage
<ul>
<li><a href="https://www.w3.org/TR/css-speech-1/#percentage-def">in css-speech-1</a>
<li><a href="https://drafts.csswg.org/css-values-3/#percentage">in css-values-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-color-3/#peru">peru</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#petite-caps">petite-caps</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#physical">physical</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#physical-bottom">physical bottom</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#physical-dimensions">physical dimensions</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#physical-direction">physical direction</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#physical-left">physical left</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#physical-right">physical right</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#physical-top">physical top</a>
<li><a href="https://drafts.csswg.org/css-values-3/#physical-units">physical units</a>
<li><a href="https://drafts.csswg.org/css-color-3/#pink">pink</a>
<li><a href="https://drafts.csswg.org/css2/#reference-pixel">pixel</a>
<li><a href="https://drafts.csswg.org/css-values-3/#visual-angle-unit">pixel unit</a>
<li><a href="https://drafts.csswg.org/css-color-3/#plum">plum</a>
<li><a href="https://drafts.csswg.org/css-align-3/#positional-alignment">positional alignment</a>
<li><a href="https://drafts.csswg.org/css2/#positioned-element">positioned</a>
<li><a href="https://drafts.csswg.org/css2/#positioned-element">positioned element/box</a>
<li><a href="https://drafts.csswg.org/css2/#positioning-scheme①">positioning scheme</a>
<li><a href="https://drafts.csswg.org/css2/#positioning-scheme①">positioning schemes:</a>
<li><a href="https://www.w3.org/TR/css-font-loading-3/#possibly-pending-font-loads">possibly pending font loads</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#post-multiplied">post-multiplied</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#post-multiply">post-multiply</a>
<li><a href="https://drafts.csswg.org/css-color-3/#powderblue">powderblue</a>
<li><a href="https://drafts.csswg.org/css2/#preceding">preceding element</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#pre-multiplied">pre-multiplied</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#pre-multiply">pre-multiply</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#preserved-tokens">preserved tokens</a>
<li><a href="https://drafts.csswg.org/css-text-3/#preserved-white-space">preserved white space</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#primary-filter-primitive-tree">primary filter primitive tree</a>
<li><a href="https://drafts.csswg.org/css2/#principal-box">principal block-level box</a>
<li><a href="https://drafts.csswg.org/css-display-3/#principal-box">principal box</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#principal-writing-mode">principal writing mode</a>
<li><a href="https://drafts.csswg.org/css-break-3/#propagate">propagate</a>
<li><a href="https://drafts.csswg.org/css-break-3/#propagate">propagation</a>
<li><a href="https://drafts.csswg.org/css2/#proper-table-child">proper table child</a>
<li><a href="https://drafts.csswg.org/css2/#proper-table-row-parent">proper table row parent</a>
<li>
property
<ul>
<li><a href="https://drafts.csswg.org/css-cascade-4/#css-property">in css-cascade-4, for CSS</a>
<li><a href="https://drafts.csswg.org/css2/#property">in css2</a>
</ul>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-property-declarations">property declarations</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#proportional-nums">proportional-nums</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#proportional-width">proportional-width</a>
<li><a href="https://drafts.csswg.org/css2/#pseudo-classes①">pseudo-classes</a>
<li><a href="https://drafts.csswg.org/css2/#pseudo-elements①">pseudo-elements</a>
<li>
purple
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#purple">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#purple0">in css-color-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-syntax-3/#qualified-rule">qualified rule</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#range-context">range context</a>
<li><a href="https://drafts.csswg.org/css2/#recommended">recommended</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#reconsume-the-current-input-code-point">reconsume the current input code point</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#reconsume-the-current-input-token">reconsume the current input token</a>
<li>
red
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#red">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#red0">in css-color-3</a>
</ul>
<li>
reference box
<ul>
<li><a href="https://drafts.csswg.org/css-shapes-1/#reference-box">in css-shapes-1</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#reference-box">in css-transforms-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-values-3/#reference-pixel">reference pixel</a>
<li><a href="https://drafts.csswg.org/css-break-3/#region-break">region break</a>
<li><a href="https://drafts.csswg.org/css-values-3/#relative-length">relative length</a>
<li><a href="https://drafts.csswg.org/css2/#relative-positioning①">relative positioning</a>
<li><a href="https://drafts.csswg.org/css2/#relative-units">relative units</a>
<li><a href="https://drafts.csswg.org/css-break-3/#remaining-fragmentainer-extent">remaining fragmentainer extent</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#remaining-free-space">remaining free space</a>
<li><a href="https://drafts.csswg.org/css2/#rendered-content">rendered content</a>
<li>
renderer
<ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#renderer">in css-fonts-3</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#renderer">in css-speech-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-display-3/#replaced-element">replaced</a>
<li><a href="https://drafts.csswg.org/css-display-3/#replaced-element">replaced element</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#representation">representation</a>
<li><a href="https://drafts.csswg.org/css2/#required">required</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#reset-only-sub-property">reset-only sub-property</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#re-snap">re-snap</a>
<li><a href="https://drafts.csswg.org/css-values-3/#resolved-type">resolved type</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#transition-reversing-adjusted-start-value">reversing-adjusted start value</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#transition-reversing-shortening-factor">reversing shortening factor</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#physical-right">right</a>
<li><a href="https://drafts.csswg.org/css2/#root">root</a>
<li><a href="https://drafts.csswg.org/css-color-3/#rosybrown">rosybrown</a>
<li><a href="https://drafts.csswg.org/css2/#row-group-box">row group box</a>
<li><a href="https://drafts.csswg.org/css2/#row-groups">row groups</a>
<li><a href="https://drafts.csswg.org/css-color-3/#royalblue">royalblue</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#ruby">ruby</a>
<li><a href="https://drafts.csswg.org/css2/#rule-sets-dfn">rule set</a>
<li><a href="https://drafts.csswg.org/css2/#rules-on-anonymous-table-objects">rules on anonymous table objects</a>
<li><a href="https://drafts.csswg.org/css-display-3/#run-in">run-in</a>
<li><a href="https://drafts.csswg.org/css-display-3/#run-in">run-in box</a>
<li><a href="https://drafts.csswg.org/css-display-3/#run-in-sequence">run-in sequence</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#running-transition">running transition</a>
<li><a href="https://drafts.csswg.org/css-color-3/#saddlebrown">saddlebrown</a>
<li><a href="https://drafts.csswg.org/css-color-3/#salmon">salmon</a>
<li><a href="https://drafts.csswg.org/css-color-3/#sandybrown">sandybrown</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#sans-serif">sans-serif</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#scaled-flex-shrink-factor">scaled flex shrink factor</a>
<li><a href="https://drafts.csswg.org/css2/#scope①">scope</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#x1">screen reader</a>
<li><a href="https://drafts.csswg.org/css-text-3/#unicode-script">script property</a>
<li><a href="https://drafts.csswg.org/css-color-3/#scrollbar">scrollbar</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap">scroll snap</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-area">scroll snap area</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-container">scroll snap container</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snapport">scroll snapport</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-position">scroll snap position</a>
<li><a href="https://drafts.csswg.org/css-color-3/#seagreen">seagreen</a>
<li><a href="https://drafts.csswg.org/css-color-3/#seashell">seashell</a>
<li><a href="https://drafts.csswg.org/css-text-3/#segment-break">segment break</a>
<li>
selector
<ul>
<li><a href="https://drafts.csswg.org/css2/#selector①">in css2</a>
<li><a href="https://drafts.csswg.org/selectors-3/#selector">in selectors-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#selector-matches">selector matches</a>
<li><a href="https://drafts.csswg.org/css-align-3/#self-align">self-alignment</a>
<li><a href="https://drafts.csswg.org/css-align-3/#self-alignment-properties">self-alignment properties</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#semi-condensed-">semi-condensed</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#semi-expanded">semi-expanded</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#voice-pitch-semitone">semitone</a>
<li><a href="https://drafts.csswg.org/css2/#separated-borders-model">separated borders model</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sequence-of-simple-selectors">sequence of simple selectors</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#serialize-an-anb-value">serialize an &lt;an+b> value</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#serif">serif</a>
<li><a href="https://drafts.csswg.org/css-font-loading-3/#fontfaceset-set-entries">set entries</a>
<li><a href="https://drafts.csswg.org/css2/#shall">shall</a>
<li><a href="https://drafts.csswg.org/css2/#shall-not">shall not</a>
<li><a href="https://drafts.csswg.org/css-align-3/#shared-alignment-context">shared alignment context</a>
<li><a href="https://drafts.csswg.org/css2/#sheets">sheets</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#shorthand-property">shorthand</a>
<li><a href="https://drafts.csswg.org/css2/#shorthand-properties">shorthand properties</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#shorthand-property">shorthand property</a>
<li><a href="https://drafts.csswg.org/css2/#should">should</a>
<li><a href="https://drafts.csswg.org/css2/#should-not">should not</a>
<li><a href="https://drafts.csswg.org/css2/#sibling">sibling</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#typeset-sideways">sideways typesetting</a>
<li><a href="https://drafts.csswg.org/css-color-3/#sienna">sienna</a>
<li>
silver
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#silver">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#silver0">in css-color-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-syntax-3/#simple-block">simple block</a>
<li>
simple selector
<ul>
<li><a href="https://drafts.csswg.org/css2/#simple-selector">in css2</a>
<li><a href="https://drafts.csswg.org/selectors-3/#simple-selector">in selectors-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#simplified">simplified</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#single-line-flex-container">single-line flex container</a>
<li><a href="https://drafts.csswg.org/css-contain-1/#size-containment">size containment</a>
<li><a href="https://drafts.csswg.org/css-contain-1/#size-containment-box">size containment box</a>
<li><a href="https://drafts.csswg.org/css-contain-1/#sizing-as-if-empty">sizing as if empty</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-rows-track-sizing-function">sizing function</a>
<li><a href="https://drafts.csswg.org/css-color-3/#skyblue">skyblue</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#slashed-zero">slashed-zero</a>
<li><a href="https://drafts.csswg.org/css-color-3/#slateblue">slateblue</a>
<li><a href="https://drafts.csswg.org/css-color-3/#slategray">slategray</a>
<li><a href="https://drafts.csswg.org/css-color-3/#slategrey">slategrey</a>
<li><a href="https://drafts.csswg.org/css-text-3/#kana-small">small</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#small-caps">small-caps</a>
<li><a href="https://drafts.csswg.org/css-text-3/#kana-small">small kana</a>
<li><a href="https://drafts.csswg.org/css-color-3/#snow">snow</a>
<li><a href="https://drafts.csswg.org/css-text-3/#soft-wrap-break">soft wrap break</a>
<li><a href="https://drafts.csswg.org/css-text-3/#soft-wrap-opportunity">soft wrap opportunity</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#source">source</a>
<li><a href="https://drafts.csswg.org/css2/#source-document">source document</a>
<li><a href="https://drafts.csswg.org/css-text-3/#spaces">spaces</a>
<li><a href="https://drafts.csswg.org/css2/#space-separated-matching">space-separated matching</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#space-to-fill">space to fill</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#span-count">span count</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#spanner">spanner</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#spanning-element">spanning element</a>
<li><a href="https://drafts.csswg.org/css-images-3/#specified-size">specified size</a>
<li>
specified size suggestion
<ul>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#specified-size-suggestion">in css-flexbox-1</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#specified-size-suggestion">in css-grid-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-cascade-4/#specified-value">specified value</a>
<li><a href="https://drafts.csswg.org/css2/#specified-value">specified values</a>
<li><a href="https://drafts.csswg.org/css2/#speech-media-group">'speech' media group</a>
<li><a href="https://drafts.csswg.org/css-break-3/#spread-break">spread break</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#spread-distance">spread distance</a>
<li><a href="https://drafts.csswg.org/css-color-3/#springgreen">springgreen</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#stacked-fractions">stacked-fractions</a>
<li><a href="https://drafts.csswg.org/css2/#stacking-context">stacking context</a>
<li><a href="https://drafts.csswg.org/css2/#stack-level">stack level</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#css-start">start</a>
<li><a href="https://drafts.csswg.org/css-images-3/#starting-point">starting point</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-an-ident-sequence">starts with an ident sequence</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-a-number">starts with a number</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-two-code-points-are-a-valid-escape">starts with a valid escape</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#transition-start-time">start time</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#transition-start-value">start value</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-an-ident-sequence">start with an ident sequence</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-a-number">start with a number</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#statement-at-rule">statement at-rule</a>
<li><a href="https://drafts.csswg.org/css2/#static-media-group">'static' media group</a>
<li><a href="https://drafts.csswg.org/css2/#static-position-containing-block">static-position containing block</a>
<li><a href="https://drafts.csswg.org/css-align-3/#static-position-rectangle">static position rectangle</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#static-position-rectangle">static-position rectangle</a>
<li><a href="https://drafts.csswg.org/css-color-3/#steelblue">steelblue</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#step-easing-function">step easing function</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#step-position">step position</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#steps">steps</a>
<li><a href="https://drafts.csswg.org/css-text-3/#stop-or-comma">stop or comma</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#stretched">stretched</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#strictness-value">strictness value</a>
<li><a href="https://www.w3.org/TR/css-values-3/#string">string</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#strings-def">strings</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#stroke-bounding-box">stroke bounding box</a>
<li><a href="https://drafts.csswg.org/selectors-3/#structural-pseudo-classes">structural pseudo-classes</a>
<li><a href="https://www.w3.org/TR/css-flexbox-1/#strut-size">strut size</a>
<li><a href="https://drafts.csswg.org/css-font-loading-3/#fontfaceset-stuck-on-the-environment">stuck on the environment</a>
<li><a href="https://drafts.csswg.org/css-style-attr-1/#style-attribute">style attribute</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#style-change-event">style change event</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#style-rule">style rule</a>
<li>
style sheet
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#style-sheet">in css-backgrounds-3</a>
<li><a href="https://www.w3.org/TR/css-namespaces-3/#style-sheet">in css-namespaces-3</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#style-sheet">in css-speech-1</a>
</ul>
<li>
style sheet!!as conformance class
<ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#style-sheet">in css-fonts-3</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#style-sheet0">in css-speech-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#sub">sub</a>
<li><a href="https://drafts.csswg.org/css2/#subject">subject (of selector)</a>
<li><a href="https://drafts.csswg.org/css2/#subject">subjects</a>
<li><a href="https://drafts.csswg.org/selectors-3/#subjects-of-the-selector">subjects of the selector</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#longhand">sub-property</a>
<li><a href="https://drafts.csswg.org/selectors-3/#subsequent-sibling-combinator">subsequent-sibling combinator</a>
<li><a href="https://drafts.csswg.org/css-variables-1/#substitute-a-var">substitute a var()</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#super">super</a>
<li>
support
<ul>
<li><a href="https://drafts.csswg.org/css-conditional-3/#dfn-support">in css-conditional-3, for CSS</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#support">in css-fonts-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-conditional-3/#supports-queries">supports queries</a>
<li><a href="https://drafts.csswg.org/css-font-loading-3/#switch-the-fontfaceset-to-loaded">switch the fontfaceset to loaded</a>
<li><a href="https://drafts.csswg.org/css-font-loading-3/#switch-the-fontfaceset-to-loading">switch the fontfaceset to loading</a>
<li><a href="https://drafts.csswg.org/css-align-3/#synthesize-baseline">synthesize baseline</a>
<li><a href="https://drafts.csswg.org/css-align-3/#synthesize-baseline">synthesized baseline</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#system-font-fallback">system font fallback</a>
<li><a href="https://drafts.csswg.org/css2/#system-fonts">system fonts</a>
<li><a href="https://drafts.csswg.org/css2/#table">table</a>
<li><a href="https://drafts.csswg.org/css-display-3/#table-caption-box">table caption box</a>
<li><a href="https://drafts.csswg.org/css2/#table-element">table element</a>
<li><a href="https://drafts.csswg.org/css2/#table-grid-box">table grid box</a>
<li><a href="https://drafts.csswg.org/css2/#table-wrapper-box">table wrapper box</a>
<li><a href="https://drafts.csswg.org/css-text-3/#tabs">tabs</a>
<li><a href="https://drafts.csswg.org/css-text-3/#tab-size-dfn">tab size</a>
<li><a href="https://drafts.csswg.org/css-text-3/#tab-stop">tab stop</a>
<li><a href="https://drafts.csswg.org/css2/#tabular-container">tabular container</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#tabular-nums">tabular-nums</a>
<li><a href="https://drafts.csswg.org/css2/#tactile-media-group">'tactile' media group</a>
<li><a href="https://drafts.csswg.org/css-color-3/#tan">tan</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#target-main-size">target main size</a>
<li>
teal
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#teal">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#teal0">in css-color-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-display-3/#text-nodes">text node</a>
<li><a href="https://drafts.csswg.org/css-display-3/#text-run">text run</a>
<li>
textual data types
<ul>
<li><a href="https://www.w3.org/TR/css-values-3/#textual-data-types">in css-values-3</a>
<li><a href="https://drafts.csswg.org/css-values-3/#css-textual-data-types">in css-values-3, for CSS</a>
</ul>
<li><a href="https://drafts.csswg.org/css-color-3/#thistle">thistle</a>
<li><a href="https://drafts.csswg.org/css-color-3/#threeddarkshadow">threeddarkshadow</a>
<li><a href="https://drafts.csswg.org/css-color-3/#threedface">threedface</a>
<li><a href="https://drafts.csswg.org/css-color-3/#threedhighlight">threedhighlight</a>
<li><a href="https://drafts.csswg.org/css-color-3/#threedlightshadow">threedlightshadow</a>
<li><a href="https://drafts.csswg.org/css-color-3/#threedshadow">threedshadow</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#time-def">time</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#easing-function">timing function</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#titling-caps">titling-caps</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-tokenize">tokenization</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#css-tokenize">tokenize</a>
<li><a href="https://drafts.csswg.org/css2/#tokenizer">tokenizer</a>
<li><a href="https://drafts.csswg.org/css-color-3/#tomato">tomato</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#physical-top">top</a>
<li><a href="https://drafts.csswg.org/css-text-3/#tracking">tracking</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#track-list">track list</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#track-section">track section</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#track-sizing-algorithm">track sizing algorithm</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-rows-track-sizing-function">track sizing function</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#traditional">traditional</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#transfer-function-element">transfer function element</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#transfer-function-element-attributes">transfer function element attributes</a>
<li>
transferred size suggestion
<ul>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#transferred-size-suggestion">in css-flexbox-1</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#transferred-size-suggestion">in css-grid-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-transforms-1/#transformable-element">transformable element</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#transformation-matrix">transformation matrix</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#transformed-element">transformed element</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#transitionable">transitionable</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascade-origin-transition">transition origin</a>
<li><a href="https://drafts.csswg.org/css-color-3/#transparent-def">transparent</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-areas-trash-token">trash token</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#triangle">triangle</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#trinary">trinary</a>
<li><a href="https://drafts.csswg.org/css-color-3/#turquoise">turquoise</a>
<li>
type selector
<ul>
<li><a href="https://drafts.csswg.org/css2/#type-selector">in css2</a>
<li><a href="https://drafts.csswg.org/selectors-3/#type-selector">in selectors-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#typeset-sideways">typeset sideways</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#typeset-sideways">typesetting sideways</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#typeset-upright">typesetting upright</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#typeset-upright">typeset upright</a>
<li><a href="https://drafts.csswg.org/css-text-3/#typographic-character-unit">typographic character</a>
<li><a href="https://drafts.csswg.org/css-text-3/#typographic-character-unit">typographic character unit</a>
<li><a href="https://drafts.csswg.org/css-text-3/#typographic-letter-unit">typographic letter unit</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#typographic-mode">typographic mode</a>
<li>
ua
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#ua">in css-backgrounds-3</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#ua">in css-speech-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascade-origin-ua">ua origin</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascade-origin-ua">ua-origin</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascade-origin-ua">ua style sheet</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#ultra-condensed">ultra-condensed</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#ultra-expanded">ultra-expanded</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#under">under</a>
<li><a href="https://drafts.csswg.org/css-break-3/#unforced-break">unforced break</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#unicase">unicase</a>
<li><a href="https://drafts.csswg.org/css-text-3/#unicode-general-category">unicode category</a>
<li><a href="https://drafts.csswg.org/css-text-3/#unicode-east-asian-width">unicode east asian width</a>
<li><a href="https://drafts.csswg.org/css-text-3/#unicode-general-category">unicode general category</a>
<li><a href="https://drafts.csswg.org/css-text-3/#unicode-script">unicode script</a>
<li><a href="https://drafts.csswg.org/css-text-3/#unicode-vertical-orientation">unicode vertical orientation</a>
<li>
universal selector
<ul>
<li><a href="https://drafts.csswg.org/css2/#universal-selector①">in css2</a>
<li><a href="https://drafts.csswg.org/selectors-3/#universal-selector0">in selectors-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-text-3/#writing-system-known">unknown</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#unoccupied">unoccupied</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#upper-alpha-legal">upper-alpha-legal</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#uppercase-letter">uppercase letter</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#typeset-upright">upright typesetting</a>
<li><a href="https://drafts.csswg.org/css-values-3/#url">url</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#use-a-negative-sign">use a negative sign</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#used-value">used value</a>
<li><a href="https://drafts.csswg.org/css2/#used-value">used values</a>
<li><a href="https://drafts.csswg.org/css2/#user">user</a>
<li>
user agent
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#user-agent">in css-backgrounds-3</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#user-agent">in css-speech-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascade-origin-ua">user-agent origin</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascade-origin-ua">user-agent style sheet</a>
<li><a href="https://drafts.csswg.org/css2/#user-agent">user agent (ua)</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#user-coordinate-system">user coordinate system</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascade-origin-user">user origin</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascade-origin-user">user-origin</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#cascade-origin-user">user style sheet</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#use-a-negative-sign">uses a negative sign</a>
<li><a href="https://drafts.csswg.org/css-images-3/#invalid-image">valid image</a>
<li><a href="https://drafts.csswg.org/css2/#valid-style-sheet">validity</a>
<li><a href="https://drafts.csswg.org/css2/#valid-style-sheet">valid style sheet</a>
<li><a href="https://drafts.csswg.org/css-values-3/#css-value-definition-syntax">value definition syntax</a>
<li><a href="https://drafts.csswg.org/css2/#values">values</a>
<li><a href="https://drafts.csswg.org/css-variables-1/#substitute-a-var">var() substitution</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#y-axis">vertical axis</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#vertical-block-flow">vertical block flow</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#vertical-dimension">vertical dimension</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#vertical-offset">vertical offset</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#vertical-only">vertical-only</a>
<li><a href="https://drafts.csswg.org/css-text-3/#unicode-vertical-orientation">vertical orientation</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#vertical-script">vertical script</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#vertical-typographic-mode">vertical typographic mode</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#vertical-writing-mode">vertical writing mode</a>
<li><a href="https://drafts.csswg.org/css2/#viewport①">viewport</a>
<li><a href="https://drafts.csswg.org/css-values-3/#viewport-percentage-lengths">viewport-percentage lengths</a>
<li><a href="https://drafts.csswg.org/css-color-3/#violet">violet</a>
<li><a href="https://drafts.csswg.org/css-values-3/#visual-angle-unit">visual angle unit</a>
<li><a href="https://www.w3.org/TR/css-speech-1/#box-model-def">visual box model</a>
<li><a href="https://drafts.csswg.org/css2/#visual-formatting-model">visual formatting model</a>
<li><a href="https://drafts.csswg.org/css2/#visual-media-group">'visual' media group</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#weight">weight</a>
<li><a href="https://drafts.csswg.org/css-color-3/#wheat">wheat</a>
<li>
white
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#white">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#white0">in css-color-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-color-3/#whitesmoke">whitesmoke</a>
<li><a href="https://drafts.csswg.org/css-text-3/#white-space">white space</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#whitespace">whitespace</a>
<li><a href="https://drafts.csswg.org/css-text-3/#white-space">white space characters</a>
<li>
width
<ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#width">in css-fonts-3</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#width">in css-writing-modes-4</a>
</ul>
<li><a href="https://drafts.csswg.org/css-color-3/#window">window</a>
<li><a href="https://drafts.csswg.org/css-color-3/#windowframe">windowframe</a>
<li><a href="https://drafts.csswg.org/css-color-3/#windowtext">windowtext</a>
<li><a href="https://drafts.csswg.org/css-text-3/#word-separator">word separator</a>
<li><a href="https://drafts.csswg.org/css-text-3/#word-separator">word-separator character</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-an-ident-sequence">would start an ident sequence</a>
<li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-a-number">would start a number</a>
<li>
wrap
<ul>
<li><a href="https://drafts.csswg.org/css-shapes-1/#wrap">in css-shapes-1</a>
<li><a href="https://drafts.csswg.org/css-text-3/#wrapping">in css-text-3</a>
</ul>
<li>
wrapping
<ul>
<li><a href="https://drafts.csswg.org/css-shapes-1/#wrap">in css-shapes-1</a>
<li><a href="https://drafts.csswg.org/css-text-3/#wrapping">in css-text-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#writing-mode">writing mode</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#x-axis">x-axis</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#y-axis">y-axis</a>
<li>
yellow
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#yellow">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#yellow0">in css-color-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-color-3/#yellowgreen">yellowgreen</a>
</ul>
</div>
<h3 class="heading settled" data-level="5.2" id="selectors"><span class="secno">5.2. </span><span class="content">Selector Index</span><a class="self-link" href="#selectors"></a></h3>
<div data-link-spec="
css2,
css-syntax-3,
css-style-attr-1,
mediaqueries-3,
mediaqueries-4,
css-conditional-3,
css-namespaces-3,
selectors-3,
css-cascade-4,
css-values-3,
css-color-3,
css-backgrounds-3,
css-images-3,
css-fonts-3,
css-multicol-1,
css-ui-3,
compositing-1,
css-writing-modes-3,
css-writing-modes-4,
css-transitions-1,
css-animations-1,
css-easing-1,
css-flexbox-1,
css-transforms-1,
css-variables-1,
css-text-3,
css-counter-styles-3,
css-masking-1,
css-shapes-1,
css-text-decor-3,
css-will-change-1,
css-speech-1,
css-align-3,
css-grid-1,
filter-effects-1,
css-break-3,
css-contain-1,
css-scroll-snap-1,
css-display-3,
css-font-loading-3" data-link-status="TR">
<ul class="index">
<li><a href="https://drafts.csswg.org/selectors-3/#x">*</a>
<li>
:active
<ul>
<li><a href="https://drafts.csswg.org/css2/#selectordef-active">in css2</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-active">in selectors-3</a>
</ul>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-after">::after</a>
<li><a href="https://drafts.csswg.org/css2/#selectordef-after">:after</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-before">::before</a>
<li><a href="https://drafts.csswg.org/css2/#selectordef-before">:before</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-checked">:checked</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-disabled">:disabled</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-empty">:empty</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-enabled">:enabled</a>
<li><a href="https://drafts.csswg.org/css2/#selectordef-first">:first</a>
<li>
:first-child
<ul>
<li><a href="https://drafts.csswg.org/css2/#selectordef-first-child">in css2</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-first-child">in selectors-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#selectordef-first-child">first-child</a>
<li><a href="https://drafts.csswg.org/selectors-3/#first-letter0">::first-letter</a>
<li><a href="https://drafts.csswg.org/css2/#selectordef-first-letter">:first-letter</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-first-line">::first-line</a>
<li><a href="https://drafts.csswg.org/css2/#selectordef-first-line">:first-line</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-first-of-type">:first-of-type</a>
<li>
:focus
<ul>
<li><a href="https://drafts.csswg.org/css2/#selectordef-focus">in css2</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-focus">in selectors-3</a>
</ul>
<li>
:hover
<ul>
<li><a href="https://drafts.csswg.org/css2/#selectordef-hover">in css2</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-hover">in selectors-3</a>
</ul>
<li>
:lang
<ul>
<li><a href="https://drafts.csswg.org/css2/#selectordef-lang">in css2</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-lang">in selectors-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#selectordef-lang">:lang()</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-last-child">:last-child</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-last-of-type">:last-of-type</a>
<li><a href="https://drafts.csswg.org/css2/#selectordef-left">:left</a>
<li>
:link
<ul>
<li><a href="https://drafts.csswg.org/css2/#selectordef-link">in css2</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-link">in selectors-3</a>
</ul>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-not">:not()</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-nth-child">:nth-child()</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-nth-last-child">:nth-last-child()</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-nth-last-of-type">:nth-last-of-type()</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-nth-of-type">:nth-of-type()</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-only-child">:only-child</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-only-of-type">:only-of-type</a>
<li><a href="https://drafts.csswg.org/css2/#selectordef-right">:right</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-root">:root</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-target">:target</a>
<li>
:visited
<ul>
<li><a href="https://drafts.csswg.org/css2/#selectordef-visited">in css2</a>
<li><a href="https://drafts.csswg.org/selectors-3/#sel-visited">in selectors-3</a>
</ul>
</ul>
</div>
<h3 class="heading settled" data-level="5.3" id="at-rules"><span class="secno">5.3. </span><span class="content"> At-Rule Index</span><a class="self-link" href="#at-rules"></a></h3>
<div data-link-spec="
css2,
css-syntax-3,
css-style-attr-1,
mediaqueries-3,
mediaqueries-4,
css-conditional-3,
css-namespaces-3,
selectors-3,
css-cascade-4,
css-values-3,
css-color-3,
css-backgrounds-3,
css-images-3,
css-fonts-3,
css-multicol-1,
css-ui-3,
compositing-1,
css-writing-modes-3,
css-writing-modes-4,
css-transitions-1,
css-animations-1,
css-easing-1,
css-flexbox-1,
css-transforms-1,
css-variables-1,
css-text-3,
css-counter-styles-3,
css-masking-1,
css-shapes-1,
css-text-decor-3,
css-will-change-1,
css-speech-1,
css-align-3,
css-grid-1,
filter-effects-1,
css-break-3,
css-contain-1,
css-scroll-snap-1,
css-display-3,
css-font-loading-3" data-link-status="TR">
<ul class="index">
<li><a href="https://drafts.csswg.org/css-syntax-3/#at-ruledef-charset">@charset</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#at-ruledef-counter-style">@counter-style</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#at-font-face-rule">@font-face</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#at-ruledef-import">@import</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#at-ruledef-keyframes">@keyframes</a>
<li><a href="https://drafts.csswg.org/css-conditional-3/#at-ruledef-media">@media</a>
<li><a href="https://drafts.csswg.org/css2/#at-ruledef-media①">media</a>
<li><a href="https://drafts.csswg.org/css2/#at-ruledef-page">@page</a>
<li><a href="https://drafts.csswg.org/css-conditional-3/#at-ruledef-supports">@supports</a>
</ul>
</div>
<h3 class="heading settled" data-level="5.4" id="properties"><span class="secno">5.4. </span><span class="content">Property Index</span><a class="self-link" href="#properties"></a></h3>
<div data-link-spec="
css2,
css-syntax-3,
css-style-attr-1,
mediaqueries-3,
mediaqueries-4,
css-conditional-3,
css-namespaces-3,
selectors-3,
css-cascade-4,
css-values-3,
css-color-3,
css-backgrounds-3,
css-images-3,
css-fonts-3,
css-multicol-1,
css-ui-3,
compositing-1,
css-writing-modes-3,
css-writing-modes-4,
css-transitions-1,
css-animations-1,
css-easing-1,
css-flexbox-1,
css-transforms-1,
css-variables-1,
css-text-3,
css-counter-styles-3,
css-masking-1,
css-shapes-1,
css-text-decor-3,
css-will-change-1,
css-speech-1,
css-align-3,
css-grid-1,
filter-effects-1,
css-break-3,
css-contain-1,
css-scroll-snap-1,
css-display-3,
css-font-loading-3" data-link-status="TR">
<ul class="index">
<li><a href="https://drafts.csswg.org/css-variables-1/#propdef-">--*</a>
<li>
align-content
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-align-content">in css-align-3</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-align-content">in css-flexbox-1</a>
</ul>
<li>
align-items
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-align-items">in css-align-3</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-align-items">in css-flexbox-1</a>
</ul>
<li>
align-self
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-align-self">in css-align-3</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-align-self">in css-flexbox-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-cascade-4/#propdef-all">all</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation">animation</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-delay">animation-delay</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-direction">animation-direction</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-duration">animation-duration</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-fill-mode">animation-fill-mode</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-iteration-count">animation-iteration-count</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-name">animation-name</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-play-state">animation-play-state</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-timing-function">animation-timing-function</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-azimuth">azimuth</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background">background</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-attachment">background-attachment</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#propdef-background-blend-mode">background-blend-mode</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-clip">background-clip</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-color">background-color</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-image">background-image</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-origin">background-origin</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-position">background-position</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-repeat">background-repeat</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-size">background-size</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border">border</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-bottom">border-bottom</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-bottom-color">border-bottom-color</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-bottom-left-radius">border-bottom-left-radius</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-bottom-right-radius">border-bottom-right-radius</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-bottom-style">border-bottom-style</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-bottom-width">border-bottom-width</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-border-collapse">border-collapse</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-color">border-color</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-image">border-image</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-image-outset">border-image-outset</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-image-repeat">border-image-repeat</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-image-slice">border-image-slice</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-image-source">border-image-source</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-image-width">border-image-width</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-left">border-left</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-left-color">border-left-color</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-left-style">border-left-style</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-left-width">border-left-width</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-radius">border-radius</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-right">border-right</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-right-color">border-right-color</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-right-style">border-right-style</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-right-width">border-right-width</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-border-spacing">border-spacing</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-style">border-style</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-top">border-top</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-top-color">border-top-color</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-top-left-radius">border-top-left-radius</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-top-right-radius">border-top-right-radius</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-top-style">border-top-style</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-top-width">border-top-width</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-width">border-width</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-bottom">bottom</a>
<li><a href="https://drafts.csswg.org/css-break-3/#propdef-box-decoration-break">box-decoration-break</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-box-shadow">box-shadow</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#propdef-box-sizing">box-sizing</a>
<li><a href="https://drafts.csswg.org/css-break-3/#propdef-break-after">break-after</a>
<li><a href="https://drafts.csswg.org/css-break-3/#propdef-break-before">break-before</a>
<li><a href="https://drafts.csswg.org/css-break-3/#propdef-break-inside">break-inside</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-caption-side">caption-side</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#propdef-caret-color">caret-color</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-clear">clear</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-clip">clip</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-clip-path">clip-path</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-clip-rule">clip-rule</a>
<li>
color
<ul>
<li><a href="https://drafts.csswg.org/css-color-3/#color0">in css-color-3</a>
<li><a href="https://drafts.csswg.org/css-color-3/#color01">in css-color-3</a>
</ul>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#propdef-color-interpolation-filters">color-interpolation-filters</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-count">column-count</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-fill">column-fill</a>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-column-gap">column-gap</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-rule">column-rule</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-rule-color">column-rule-color</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-rule-style">column-rule-style</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-rule-width">column-rule-width</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-columns">columns</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-span">column-span</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-width">column-width</a>
<li><a href="https://drafts.csswg.org/css-contain-1/#propdef-contain">contain</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-content">content</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-counter-increment">counter-increment</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-counter-reset">counter-reset</a>
<li>
cue
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-cue">in css-speech-1</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-cue">in css2</a>
</ul>
<li>
cue-after
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-cue-after">in css-speech-1</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-cue-after">in css2</a>
</ul>
<li>
cue-before
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-cue-before">in css-speech-1</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-cue-before">in css2</a>
</ul>
<li><a href="https://drafts.csswg.org/css-ui-3/#propdef-cursor">cursor</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#propdef-direction">direction</a>
<li><a href="https://drafts.csswg.org/css-display-3/#propdef-display">display</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-elevation">elevation</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-empty-cells">empty-cells</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#propdef-filter">filter</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex">flex</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex-basis">flex-basis</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex-direction">flex-direction</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex-flow">flex-flow</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex-grow">flex-grow</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex-shrink">flex-shrink</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex-wrap">flex-wrap</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-float">float</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#propdef-flood-color">flood-color</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#propdef-flood-opacity">flood-opacity</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font">font</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-family">font-family</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-feature-settings">font-feature-settings</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-kerning">font-kerning</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-size">font-size</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-size-adjust">font-size-adjust</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-stretch">font-stretch</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-style">font-style</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-synthesis">font-synthesis</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-variant">font-variant</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-variant-caps">font-variant-caps</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-variant-east-asian">font-variant-east-asian</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-variant-ligatures">font-variant-ligatures</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-variant-numeric">font-variant-numeric</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-variant-position">font-variant-position</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-weight">font-weight</a>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-gap">gap</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#propdef-mix">globalcompositeoperation</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#propdef-glyph-orientation-vertical">glyph-orientation-vertical</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid">grid</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-area">grid-area</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-columns">grid-auto-columns</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-flow">grid-auto-flow</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-rows">grid-auto-rows</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-column">grid-column</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-column-end">grid-column-end</a>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-grid-column-gap">grid-column-gap</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-column-start">grid-column-start</a>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-grid-gap">grid-gap</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-row">grid-row</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-row-end">grid-row-end</a>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-grid-row-gap">grid-row-gap</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-row-start">grid-row-start</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template">grid-template</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template-areas">grid-template-areas</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template-columns">grid-template-columns</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template-rows">grid-template-rows</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-hanging-punctuation">hanging-punctuation</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-height">height</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-hyphens">hyphens</a>
<li><a href="https://drafts.csswg.org/css-images-3/#propdef-image-orientation">image-orientation</a>
<li><a href="https://drafts.csswg.org/css-images-3/#propdef-image-rendering">image-rendering</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#propdef-isolation">isolation</a>
<li>
justify-content
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-justify-content">in css-align-3</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-justify-content">in css-flexbox-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-justify-items">justify-items</a>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-justify-self">justify-self</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-left">left</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-letter-spacing">letter-spacing</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#propdef-lighting-color">lighting-color</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-line-break">line-break</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-line-height">line-height</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-list-style">list-style</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-list-style-image">list-style-image</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-list-style-position">list-style-position</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-list-style-type">list-style-type</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-margin">margin</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-margin-bottom">margin-bottom</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-margin-left">margin-left</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-margin-right">margin-right</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-margin-top">margin-top</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask">mask</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-border">mask-border</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-border-mode">mask-border-mode</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-border-outset">mask-border-outset</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-border-repeat">mask-border-repeat</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-border-slice">mask-border-slice</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-border-source">mask-border-source</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-border-width">mask-border-width</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-clip">mask-clip</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-composite">mask-composite</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-image">mask-image</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-mode">mask-mode</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-origin">mask-origin</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-position">mask-position</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-repeat">mask-repeat</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-size">mask-size</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-type">mask-type</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-max-height">max-height</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-max-width">max-width</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-min-height">min-height</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-min-width">min-width</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#propdef-mix-blend-mode">mix-blend-mode</a>
<li><a href="https://drafts.csswg.org/css-images-3/#propdef-object-fit">object-fit</a>
<li><a href="https://drafts.csswg.org/css-images-3/#propdef-object-position">object-position</a>
<li><a href="https://drafts.csswg.org/css-color-3/#opacity">opacity</a>
<li>
order
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#propdef-order">in css-display-3</a>
<li><a href="https://www.w3.org/TR/css-flexbox-1/#propdef-order">in css-flexbox-1</a>
</ul>
<li><a href="https://drafts.csswg.org/css-break-3/#propdef-orphans">orphans</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#propdef-outline">outline</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#propdef-outline-color">outline-color</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#propdef-outline-offset">outline-offset</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#propdef-outline-style">outline-style</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#propdef-outline-width">outline-width</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-overflow">overflow</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-overflow-wrap">overflow-wrap</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-padding">padding</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-padding-bottom">padding-bottom</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-padding-left">padding-left</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-padding-right">padding-right</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-padding-top">padding-top</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-page-break-after">page-break-after</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-page-break-before">page-break-before</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-page-break-inside">page-break-inside</a>
<li>
pause
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-pause">in css-speech-1</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-pause">in css2</a>
</ul>
<li>
pause-after
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-pause-after">in css-speech-1</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-pause-after">in css2</a>
</ul>
<li>
pause-before
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-pause-before">in css-speech-1</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-pause-before">in css2</a>
</ul>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-pitch">pitch</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-pitch-range">pitch-range</a>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-place-content">place-content</a>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-place-items">place-items</a>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-place-self">place-self</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-play-during">play-during</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-position">position</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-quotes">quotes</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#propdef-resize">resize</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-rest">rest</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-rest-after">rest-after</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-rest-before">rest-before</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-richness">richness</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-right">right</a>
<li><a href="https://drafts.csswg.org/css-align-3/#propdef-row-gap">row-gap</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin">scroll-margin</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin-block">scroll-margin-block</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin-block-end">scroll-margin-block-end</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin-block-start">scroll-margin-block-start</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin-bottom">scroll-margin-bottom</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin-inline">scroll-margin-inline</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin-inline-end">scroll-margin-inline-end</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin-inline-start">scroll-margin-inline-start</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin-left">scroll-margin-left</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin-right">scroll-margin-right</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin-top">scroll-margin-top</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-padding">scroll-padding</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-padding-block">scroll-padding-block</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-padding-block-end">scroll-padding-block-end</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-padding-block-start">scroll-padding-block-start</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-padding-bottom">scroll-padding-bottom</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-padding-inline">scroll-padding-inline</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-padding-inline-end">scroll-padding-inline-end</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-padding-inline-start">scroll-padding-inline-start</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-padding-left">scroll-padding-left</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-padding-right">scroll-padding-right</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-padding-top">scroll-padding-top</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-snap-align">scroll-snap-align</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-snap-stop">scroll-snap-stop</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-snap-type">scroll-snap-type</a>
<li><a href="https://drafts.csswg.org/css-shapes-1/#propdef-shape-image-threshold">shape-image-threshold</a>
<li><a href="https://drafts.csswg.org/css-shapes-1/#propdef-shape-margin">shape-margin</a>
<li><a href="https://drafts.csswg.org/css-shapes-1/#propdef-shape-outside">shape-outside</a>
<li>
speak
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-speak">in css-speech-1</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-speak">in css2</a>
</ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-speak-as">speak-as</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-speak-header">speak-header</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-speak-numeral">speak-numeral</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-speak-punctuation">speak-punctuation</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-speech-rate">speech-rate</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-stress">stress</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-table-layout">table-layout</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-tab-size">tab-size</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-text-align">text-align</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-text-align-all">text-align-all</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-text-align-last">text-align-last</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#propdef-text-combine-upright">text-combine-upright</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-decoration">text-decoration</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-decoration-color">text-decoration-color</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-decoration-line">text-decoration-line</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-decoration-style">text-decoration-style</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-emphasis">text-emphasis</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-emphasis-color">text-emphasis-color</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-emphasis-position">text-emphasis-position</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-emphasis-style">text-emphasis-style</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-text-indent">text-indent</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-text-justify">text-justify</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#propdef-text-orientation">text-orientation</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#propdef-text-overflow">text-overflow</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-shadow">text-shadow</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-text-transform">text-transform</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-underline-position">text-underline-position</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-top">top</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#propdef-transform">transform</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#propdef-transform-box">transform-box</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#propdef-transform-origin">transform-origin</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#propdef-transition">transition</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#propdef-transition-delay">transition-delay</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#propdef-transition-duration">transition-duration</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#propdef-transition-property">transition-property</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#propdef-transition-timing-function">transition-timing-function</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#propdef-unicode-bidi">unicode-bidi</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-vertical-align">vertical-align</a>
<li><a href="https://drafts.csswg.org/css-display-3/#propdef-visibility">visibility</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-voice-balance">voice-balance</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-voice-duration">voice-duration</a>
<li>
voice-family
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-voice-family">in css-speech-1</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-voice-family">in css2</a>
</ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-voice-pitch">voice-pitch</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-voice-range">voice-range</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-voice-rate">voice-rate</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-voice-stress">voice-stress</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#propdef-voice-volume">voice-volume</a>
<li><a href="https://www.w3.org/TR/CSS2/aural.html#propdef-volume">volume</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-white-space">white-space</a>
<li><a href="https://drafts.csswg.org/css-break-3/#propdef-widows">widows</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-width">width</a>
<li><a href="https://drafts.csswg.org/css-will-change-1/#propdef-will-change">will-change</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-word-break">word-break</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-word-spacing">word-spacing</a>
<li><a href="https://drafts.csswg.org/css-text-3/#propdef-word-wrap">word-wrap</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#propdef-writing-mode">writing-mode</a>
<li><a href="https://drafts.csswg.org/css2/#propdef-z-index">z-index</a>
</ul>
</div>
<h3 class="heading settled" data-level="5.5" id="values"><span class="secno">5.5. </span><span class="content">Values Index</span><a class="self-link" href="#values"></a></h3>
<div data-link-spec="
css2,
css-syntax-3,
css-style-attr-1,
mediaqueries-3,
mediaqueries-4,
css-conditional-3,
css-namespaces-3,
selectors-3,
css-cascade-4,
css-values-3,
css-color-3,
css-backgrounds-3,
css-images-3,
css-fonts-3,
css-multicol-1,
css-ui-3,
compositing-1,
css-writing-modes-3,
css-writing-modes-4,
css-transitions-1,
css-animations-1,
css-easing-1,
css-flexbox-1,
css-transforms-1,
css-variables-1,
css-text-3,
css-counter-styles-3,
css-masking-1,
css-shapes-1,
css-text-decor-3,
css-will-change-1,
css-speech-1,
css-align-3,
css-grid-1,
filter-effects-1,
css-break-3,
css-contain-1,
css-scroll-snap-1,
css-display-3,
css-font-loading-3" data-link-status="TR">
<ul class="index">
<li><a href="https://www.w3.org/TR/css-images-3/#valdef-image-orientation-angle"></a>
<li>
absolute
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-pitch-absolute">in css-speech-1, for voice-pitch</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-range-absolute">in css-speech-1, for voice-range</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-position-absolute">in css2, for position</a>
</ul>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-composite-add">add</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-system-additive">additive</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-alias">alias</a>
<li>
all
<ul>
<li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-span-all">in css-multicol-1, for column-span</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#valdef-transition-property-all">in css-transitions-1, for transition-property</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-text-combine-upright-all">in css-writing-modes-4, for text-combine-upright</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-media-all">in css2, for @media</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-all">in mediaqueries-4, for @media</a>
</ul>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-hanging-punctuation-allow-end">allow-end</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-all-scroll">all-scroll</a>
<li>
alpha
<ul>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-border-mode-alpha">in css-masking-1, for mask-border-mode</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-mode-alpha">in css-masking-1, for mask-mode</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-type-alpha">in css-masking-1, for mask-type</a>
</ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-system-alphabetic">alphabetic</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-direction-alternate">alternate</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-direction-alternate-reverse">alternate-reverse</a>
<li>
always
<ul>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-stop-always">in css-scroll-snap-1, for scroll-snap-stop</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-speak-always">in css-speech-1, for speak</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-page-break-always">in css2, for page-break-before, page-break-after, page-break-inside</a>
</ul>
<li>
&lt;angle>
<ul>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-orientation-angle">in css-images-3, for image-orientation</a>
<li><a href="https://www.w3.org/TR/css-images-3/#valdef-image-orientation-angle">in css-images-3, for image-orientation</a>
</ul>
<li>
anywhere
<ul>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-line-break-anywhere">in css-text-3, for line-break</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-overflow-wrap-anywhere">in css-text-3, for overflow-wrap</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-aqua">aqua</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-arabic-indic">arabic-indic</a>
<li>
armenian
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#armenian">in css-counter-styles-3, for &lt;counter-style-name></a>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-armenian">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-armenian">in css2, for list-style-type</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-content-attr-x">attr(x)</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-aural">aural</a>
<li>
auto
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-align-self-auto">in css-align-3, for align-self</a>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-auto">in css-align-3, for justify-self</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-size-auto">in css-backgrounds-3, for background-size</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-width-auto">in css-backgrounds-3, for border-image-width</a>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-auto">in css-break-3, for break-before, break-after</a>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-inside-auto">in css-break-3, for break-inside, page-break-inside</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-range-auto">in css-counter-styles-3, for @counter-style/range</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-speak-as-auto">in css-counter-styles-3, for @counter-style/speak-as</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-items-auto">in css-flexbox-1, for align-items, align-self</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-basis-auto">in css-flexbox-1, for flex-basis</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-placement-auto">in css-grid-1, for &lt;grid-line></a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-columns-auto">in css-grid-1, for grid-template-columns, grid-template-rows</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-rendering-auto">in css-images-3, for image-rendering</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-count-auto">in css-multicol-1, for column-count</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-fill-auto">in css-multicol-1, for column-fill</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-width-auto">in css-multicol-1, for column-width</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-padding-auto">in css-scroll-snap-1, for scroll-padding, scroll-padding-inline, scroll-padding-inline-start, scroll-padding-inline-end, scroll-padding-block, scroll-padding-block-start, scroll-padding-block-end</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-speak-auto">in css-speech-1, for speak</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-duration-auto">in css-speech-1, for voice-duration</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-hyphens-auto">in css-text-3, for hyphens</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-line-break-auto">in css-text-3, for line-break</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-last-auto">in css-text-3, for text-align-last</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-justify-auto">in css-text-3, for text-justify</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#underline-auto">in css-text-decor-3, for text-underline-position</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-caret-color-auto">in css-ui-3, for caret-color</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-auto">in css-ui-3, for cursor</a>
<li><a href="https://drafts.csswg.org/css-will-change-1/#valdef-will-change-auto">in css-will-change-1, for will-change</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-top-auto①">in css2, for &lt;top>, &lt;right>, &lt;bottom>, &lt;left></a>
<li><a href="https://drafts.csswg.org/css2/#valdef-clip-auto">in css2, for clip</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-height-auto">in css2, for height</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-overflow-auto">in css2, for overflow</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-page-break-auto">in css2, for page-break-before, page-break-after, page-break-inside</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-table-layout-auto">in css2, for table-layout</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-top-auto">in css2, for top, right, bottom, left</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-width-auto">in css2, for width</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-z-index-auto">in css2, for z-index</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#valdef-color-interpolation-filters-auto">in filter-effects-1, for color-interpolation-filters</a>
</ul>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-repeat-auto-fill">auto-fill</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-repeat-auto-fit">auto-fit</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-s-auto-column">[ auto-flow &amp;&amp; dense? ] &lt;'grid-auto-rows'>? / &lt;'grid-template-columns'></a>
<li>
avoid
<ul>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-avoid">in css-break-3, for break-before, break-after</a>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-inside-avoid">in css-break-3, for break-inside, page-break-inside</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-page-break-avoid">in css2, for page-break-before, page-break-after, page-break-inside</a>
</ul>
<li>
avoid-column
<ul>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-avoid-column">in css-break-3, for break-before, break-after</a>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-inside-avoid-column">in css-break-3, for break-inside, page-break-inside</a>
</ul>
<li>
avoid-page
<ul>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-avoid-page">in css-break-3, for break-before, break-after</a>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-inside-avoid-page">in css-break-3, for break-inside, page-break-inside</a>
</ul>
<li>
avoid-region
<ul>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-avoid-region">in css-break-3, for break-before, break-after</a>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-inside-avoid-region">in css-break-3, for break-inside, page-break-inside</a>
</ul>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-fill-mode-backwards">backwards</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-fill-balance">balance</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-fill-balance-all">balance-all</a>
<li>
baseline
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-baseline">in css-align-3, for justify-self, justify-items, align-content, align-self, align-items, &lt;baseline-position></a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-items-baseline">in css-flexbox-1, for align-items, align-self</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-vertical-align-baseline">in css2, for vertical-align</a>
</ul>
<li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-outside-basic-shape">&lt;basic-shape></a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-bengali">bengali</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-unicode-bidi-bidi-override">bidi-override</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-black">black</a>
<li>
blink
<ul>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-decoration-line-blink">in css-text-decor-3, for text-decoration-line</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-text-decoration-blink">in css2, for text-decoration</a>
</ul>
<li>
block
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-block">in css-display-3, for display, &lt;display-outside></a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-type-block">in css-scroll-snap-1, for scroll-snap-type</a>
<li><a href="https://www.w3.org/TR/CSS2/visuren.html#value-def-block">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-block">in css2, for display</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-blue">blue</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-weight-bold">bold</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-weight-bolder">bolder</a>
<li>
border-box
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-clip-border-box">in css-backgrounds-3, for background-clip</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-origin-border-box">in css-backgrounds-3, for background-origin</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-clip-border-box">in css-masking-1, for mask-clip</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-origin-border-box">in css-masking-1, for mask-origin</a>
<li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-box-border-box">in css-shapes-1, for &lt;shape-box>, shape-outside</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-box-border-box">in css-transforms-1, for transform-box</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-box-sizing-border-box">in css-ui-3, for box-sizing</a>
</ul>
<li>
both
<ul>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-fill-mode-both">in css-animations-1, for animation-fill-mode</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-type-both">in css-scroll-snap-1, for scroll-snap-type</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-clear-both">in css2, for clear</a>
</ul>
<li>
bottom
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-position-bottom">in css-backgrounds-3, for background-position</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-origin-bottom">in css-transforms-1, for transform-origin</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-caption-side-bottom">in css2, for caption-side</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-vertical-align-bottom">in css2, for vertical-align</a>
</ul>
<li>
braille
<ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-media-braille">in css2, for @media</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-braille">in mediaqueries-4, for @media</a>
</ul>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-word-break-break-all">break-all</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-white-space-break-spaces">break-spaces</a>
<li>
break-word
<ul>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-overflow-wrap-break-word">in css-text-3, for overflow-wrap</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-word-break-break-word">in css-text-3, for word-break</a>
</ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-speak-as-bullets">bullets</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-cambodian">cambodian</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-transform-capitalize">capitalize</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-caption">caption</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-cell">cell</a>
<li>
center
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-self-position-center">in css-align-3, for &lt;self-position>, &lt;content-position>, justify-self, align-self, justify-content, align-content</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-position-center">in css-backgrounds-3, for background-position</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-content-center">in css-flexbox-1, for align-content</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-items-center">in css-flexbox-1, for align-items, align-self</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-justify-content-center">in css-flexbox-1, for justify-content</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-align-center">in css-scroll-snap-1, for scroll-snap-align</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-balance-center">in css-speech-1, for voice-balance</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-center">in css-text-3, for text-align</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-origin-center">in css-transforms-1, for transform-origin</a>
</ul>
<li><a href="https://drafts.csswg.org/css-values-3/#ch">ch</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-family-child">child</a>
<li>
circle
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#circle">in css-counter-styles-3, for &lt;counter-style-name></a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-ending-shape-circle">in css-images-3, for &lt;ending-shape></a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-emphasis-style-circle">in css-text-decor-3, for text-emphasis-style</a>
<li><a href="https://www.w3.org/TR/css-text-decor-3/#valdef-text-text-emphasis-style-circle">in css-text-decor-3, for text-text-emphasis-style</a>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-circle">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-circle">in css2, for list-style-type</a>
</ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#cjk-decimal">cjk-decimal</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-cjk-earthly-branch">cjk-earthly-branch</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-cjk-heavenly-stem">cjk-heavenly-stem</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#cjk-ideographic">cjk-ideographic</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#overflow-clip">clip</a>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-box-decoration-break-clone">clone</a>
<li>
close-quote
<ul>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-close-quote">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-close-quote">in css2, for content</a>
</ul>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-size-closest-corner">closest-corner</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-size-closest-side">closest-side</a>
<li><a href="https://drafts.csswg.org/css-values-3/#cm">cm</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-pointer-coarse">coarse</a>
<li>
collapse
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-visibility-collapse">in css-display-3, for visibility</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-border-collapse-collapse">in css2, for border-collapse</a>
</ul>
<li>
&lt;color>
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#shadow-color">in css-backgrounds-3, for box-shadow</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-rule-color-color">in css-multicol-1, for column-rule-color</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-border-color-color">in css2, for border-color, border-top-color, border-right-color, border-bottom-color, border-left-color</a>
</ul>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-color">color</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-color-burn">color-burn</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-color-dodge">color-dodge</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-col-resize">col-resize</a>
<li>
column
<ul>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-column">in css-break-3, for break-before, break-after</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-direction-column">in css-flexbox-1, for flex-direction</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-auto-flow-column">in css-grid-1, for grid-auto-flow</a>
</ul>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-direction-column-reverse">column-reverse</a>
<li>
contain
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-size-contain">in css-backgrounds-3, for background-size</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-object-fit-contain">in css-images-3, for object-fit</a>
</ul>
<li>
content
<ul>
<li><a href="https://drafts.csswg.org/css-contain-1/#valdef-contain-content">in css-contain-1, for contain</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-basis-content">in css-flexbox-1, for flex-basis</a>
</ul>
<li>
content-box
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-clip-content-box">in css-backgrounds-3, for background-clip</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-origin-content-box">in css-backgrounds-3, for background-origin</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-clip-content-box">in css-masking-1, for mask-clip</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-origin-content-box">in css-masking-1, for mask-origin</a>
<li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-box-content-box">in css-shapes-1, for &lt;shape-box>, shape-outside</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-box-content-box">in css-transforms-1, for transform-box</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-box-sizing-content-box">in css-ui-3, for box-sizing</a>
</ul>
<li>
contents
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-contents">in css-display-3, for display, &lt;display-box></a>
<li><a href="https://drafts.csswg.org/css-will-change-1/#valdef-will-change-contents">in css-will-change-1, for will-change</a>
</ul>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-context-menu">context-menu</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-copy">copy</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-content-counter">&lt;counter></a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-speak-as-counter-style-name">&lt;counter-style-name></a>
<li>
cover
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-size-cover">in css-backgrounds-3, for background-size</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-object-fit-cover">in css-images-3, for object-fit</a>
</ul>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-rendering-crisp-edges">crisp-edges</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-crosshair">crosshair</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-generic-family-cursive">cursive</a>
<li>
&lt;custom-ident>
<ul>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-placement-slot">in css-grid-1, for &lt;grid-line></a>
<li><a href="https://drafts.csswg.org/css-will-change-1/#valdef-will-change-custom-ident">in css-will-change-1, for will-change</a>
</ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-system-cyclic">cyclic</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-darken">darken</a>
<li>
dashed
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-dashed">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
<li><a href="https://www.w3.org/TR/CSS2/box.html#value-def-dashed">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-dashed">in css2, for &lt;border-style>, border-top-style, border-right-style, border-bottom-style, border-left-style, border-style</a>
</ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-volume-decibel">&lt;decibel></a>
<li>
decimal
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#decimal">in css-counter-styles-3, for &lt;counter-style-name></a>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-decimal">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-decimal">in css2, for list-style-type</a>
</ul>
<li>
decimal-leading-zero
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#decimal-leading-zero">in css-counter-styles-3, for &lt;counter-style-name></a>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-decimal-leading-zero">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-decimal-leading-zero">in css2, for list-style-type</a>
</ul>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-default">default</a>
<li><a href="https://drafts.csswg.org/css-values-3/#deg">deg</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-auto-flow-dense">dense</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-devanagari">devanagari</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-difference">difference</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-speak-as-digits">digits</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-text-combine-upright-digits-integer">digits &lt;integer>?</a>
<li>
disc
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#disc">in css-counter-styles-3, for &lt;counter-style-name></a>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-disc">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-disc">in css2, for list-style-type</a>
</ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#disclosure-closed">disclosure-closed</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#disclosure-open">disclosure-open</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-justify-distribute">distribute</a>
<li>
dot
<ul>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-emphasis-style-dot">in css-text-decor-3, for text-emphasis-style</a>
<li><a href="https://www.w3.org/TR/css-text-decor-3/#valdef-text-text-emphasis-style-dot">in css-text-decor-3, for text-text-emphasis-style</a>
</ul>
<li>
dotted
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-dotted">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
<li><a href="https://www.w3.org/TR/CSS2/box.html#value-def-dotted">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-dotted">in css2, for &lt;border-style>, border-top-style, border-right-style, border-bottom-style, border-left-style, border-style</a>
</ul>
<li>
double
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-double">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
<li><a href="https://www.w3.org/TR/CSS2/box.html#value-def-double">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-double">in css2, for &lt;border-style>, border-top-style, border-right-style, border-bottom-style, border-left-style, border-style</a>
</ul>
<li>
double-circle
<ul>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-emphasis-style-double-circle">in css-text-decor-3, for text-emphasis-style</a>
<li><a href="https://www.w3.org/TR/css-text-decor-3/#valdef-text-text-emphasis-style-double-circle">in css-text-decor-3, for text-text-emphasis-style</a>
</ul>
<li><a href="https://drafts.csswg.org/css-values-3/#dpcm">dpcm</a>
<li><a href="https://drafts.csswg.org/css-values-3/#dpi">dpi</a>
<li><a href="https://drafts.csswg.org/css-values-3/#dppx">dppx</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-indent-each-line">each-line</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#valdef-cubic-bezier-easing-function-ease">ease</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#valdef-cubic-bezier-easing-function-ease-in">ease-in</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#valdef-cubic-bezier-easing-function-ease-in-out">ease-in-out</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#valdef-cubic-bezier-easing-function-ease-out">ease-out</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-ending-shape-ellipse">ellipse</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#overflow-ellipsis">ellipsis</a>
<li><a href="https://drafts.csswg.org/css-values-3/#em">em</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-unicode-bidi-embed">embed</a>
<li>
embossed
<ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-media-embossed">in css2, for @media</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-embossed">in mediaqueries-4, for @media</a>
</ul>
<li>
end
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-self-position-end">in css-align-3, for &lt;self-position>, &lt;content-position>, justify-self, align-self, justify-content, align-content</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#valdef-steps-end">in css-easing-1, for steps()</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-align-end">in css-scroll-snap-1, for scroll-snap-align</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-end">in css-text-3, for text-align</a>
</ul>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-radial-gradient-ending-shape">&lt;ending-shape></a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-e-resize">e-resize</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-ethiopic-numeric">ethiopic-numeric</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-clip-rule-evenodd">evenodd</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-ew-resize">ew-resize</a>
<li><a href="https://drafts.csswg.org/css-values-3/#ex">ex</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-composite-exclude">exclude</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-exclusion">exclusion</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-system-extends">extends</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-family-family-name">&lt;family-name></a>
<li><a href="https://drafts.csswg.org/css2/#valdef-generic-family-fantasy">fantasy</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-size-farthest-corner">farthest-corner</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-size-farthest-side">farthest-side</a>
<li>
fast
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-rate-fast">in css-speech-1, for voice-rate</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-update-fast">in mediaqueries-4, for @media/update</a>
</ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-family-female">female</a>
<li>
fill
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#border-image-slice-fill">in css-backgrounds-3, for border-image-slice</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-object-fit-fill">in css-images-3, for object-fit</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-border-slice-fill">in css-masking-1, for mask-border-slice</a>
</ul>
<li>
fill-box
<ul>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-clip-path-fill-box">in css-masking-1, for clip-path</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-clip-fill-box">in css-masking-1, for mask-clip</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-origin-fill-box">in css-masking-1, for mask-origin</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-box-fill-box">in css-transforms-1, for transform-box</a>
</ul>
<li>
filled
<ul>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-emphasis-style-filled">in css-text-decor-3, for text-emphasis-style</a>
<li><a href="https://www.w3.org/TR/css-text-decor-3/#valdef-text-text-emphasis-style-filled">in css-text-decor-3, for text-text-emphasis-style</a>
</ul>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-pointer-fine">fine</a>
<li>
first
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-first-baseline">in css-align-3, for justify-self, justify-items, align-content, align-self, align-items, &lt;baseline-position></a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-hanging-punctuation-first">in css-text-3, for hanging-punctuation</a>
</ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-first-baseline">first baseline</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-columns-fit-content">fit-content()</a>
<li>
fixed
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-attachment-fixed">in css-backgrounds-3, for background-attachment</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-system-fixed">in css-counter-styles-3, for @counter-style/system</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-position-fixed">in css2, for position</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-table-layout-fixed">in css2, for table-layout</a>
</ul>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-columns-flex">&lt;flex></a>
<li>
flex
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-flex">in css-display-3, for display, &lt;display-inside></a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-display-flex">in css-flexbox-1, for display</a>
</ul>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-flex-basis">&lt;'flex-basis'></a>
<li>
flex-end
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-self-position-flex-end">in css-align-3, for &lt;self-position>, &lt;content-position>, justify-self, align-self, justify-content, align-content</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-content-flex-end">in css-flexbox-1, for align-content</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-items-flex-end">in css-flexbox-1, for align-items, align-self</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-justify-content-flex-end">in css-flexbox-1, for justify-content</a>
</ul>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-flex-grow">&lt;'flex-grow'></a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-flex-shrink">&lt;'flex-shrink'></a>
<li>
flex-start
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-self-position-flex-start">in css-align-3, for &lt;self-position>, &lt;content-position>, justify-self, align-self, justify-content, align-content</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-content-flex-start">in css-flexbox-1, for align-content</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-items-flex-start">in css-flexbox-1, for align-items, align-self</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-justify-content-flex-start">in css-flexbox-1, for justify-content</a>
</ul>
<li>
flip
<ul>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-orientation-angle">in css-images-3, for image-orientation</a>
<li><a href="https://www.w3.org/TR/css-images-3/#valdef-image-orientation-angle">in css-images-3, for image-orientation</a>
</ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-flow">flow</a>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-flow-root">flow-root</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-feature-settings-normal-value">font-feature-settings</a>
<li>
font-variant
<ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-none-value">in css-fonts-3</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-normal-value">in css-fonts-3</a>
</ul>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-hanging-punctuation-force-end">force-end</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-fill-mode-forwards">forwards</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-flex-fr">fr</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-pitch-frequency">&lt;frequency></a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-orientation-from-image">from-image</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-flex-fr">fr unit</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-fuchsia">fuchsia</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-transform-full-size-kana">full-size-kana</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-transform-full-width">full-width</a>
<li>
georgian
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#georgian">in css-counter-styles-3, for &lt;counter-style-name></a>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-georgian">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-georgian">in css2, for list-style-type</a>
</ul>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-grab">grab</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-grabbing">grabbing</a>
<li><a href="https://drafts.csswg.org/css-values-3/#grad">grad</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-gray">gray</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-green">green</a>
<li>
grid
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-grid">in css-display-3, for display, &lt;display-inside></a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-display-grid">in css-grid-1, for display</a>
</ul>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-s-auto-row">&lt;'grid-template-rows'> / [ auto-flow &amp;&amp; dense? ] &lt;'grid-auto-columns'>?</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-rowcol">&lt;'grid-template-rows'> / &lt;'grid-template-columns'></a>
<li>
groove
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-groove">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
<li><a href="https://www.w3.org/TR/CSS2/box.html#value-def-groove">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-groove">in css2, for &lt;border-style>, border-top-style, border-right-style, border-bottom-style, border-left-style, border-style</a>
</ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-gujarati">gujarati</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-gurmukhi">gurmukhi</a>
<li>
handheld
<ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-media-handheld">in css2, for @media</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-handheld">in mediaqueries-4, for @media</a>
</ul>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-indent-hanging">hanging</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-hard-light">hard-light</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#hebrew">hebrew</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-help">help</a>
<li>
hidden
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-hidden">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-visibility-hidden">in css-display-3, for visibility</a>
<li><a href="https://www.w3.org/TR/CSS2/box.html#value-def-hidden">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-hidden">in css2, for &lt;border-style>, border-top-style, border-right-style, border-bottom-style, border-left-style, border-style</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-overflow-hidden">in css2, for overflow</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-empty-cells-hide">hide</a>
<li>
high
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-pitch-high">in css-speech-1, for voice-pitch</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-range-high">in css-speech-1, for voice-range</a>
</ul>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-rendering-high-quality">high-quality</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#hiragana">hiragana</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#hiragana-iroha">hiragana-iroha</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-writing-mode-horizontal-tb">horizontal-tb</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-hover-hover">hover</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-hue">hue</a>
<li><a href="https://drafts.csswg.org/css-values-3/#Hz">hz</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-icon">icon</a>
<li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-outside-image">&lt;image></a>
<li><a href="https://drafts.csswg.org/css-values-3/#in">in</a>
<li>
infinite
<ul>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-iteration-count-infinite">in css-animations-1, for animation-iteration-count</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-resolution-infinite">in mediaqueries-4, for @media/resolution</a>
</ul>
<li><a href="https://drafts.csswg.org/css-cascade-4/#valdef-all-inherit">inherit</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#valdef-all-initial">initial</a>
<li>
inline
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-inline">in css-display-3, for display, &lt;display-outside></a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-type-inline">in css-scroll-snap-1, for scroll-snap-type</a>
<li><a href="https://www.w3.org/TR/CSS2/visuren.html#value-def-inline">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-inline">in css2, for display</a>
</ul>
<li>
inline-block
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-inline-block">in css-display-3, for display, &lt;display-legacy></a>
<li><a href="https://www.w3.org/TR/CSS2/visuren.html#value-def-inline-block">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-inline-block">in css2, for display</a>
</ul>
<li>
inline-flex
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-inline-flex">in css-display-3, for display, &lt;display-legacy></a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-display-inline-flex">in css-flexbox-1, for display</a>
</ul>
<li>
inline-grid
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-inline-grid">in css-display-3, for display, &lt;display-legacy></a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-display-inline-grid">in css-grid-1, for display</a>
</ul>
<li>
inline-table
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-inline-table">in css-display-3, for display, &lt;display-legacy></a>
<li><a href="https://www.w3.org/TR/CSS2/tables.html#value-def-inline-table">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-inline-table">in css2, for display</a>
</ul>
<li>
inset
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-inset">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#shadow-inset">in css-backgrounds-3, for box-shadow</a>
<li><a href="https://www.w3.org/TR/CSS2/box.html#value-def-inset">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-inset">in css2, for &lt;border-style>, border-top-style, border-right-style, border-bottom-style, border-left-style, border-style</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-list-style-position-inside">inside</a>
<li>
&lt;integer>
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-order-integer">in css-display-3, for order</a>
<li><a href="https://www.w3.org/TR/css-flexbox-1/#valdef-order-integer">in css-flexbox-1, for order</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-family-integer">in css-speech-1, for voice-family</a>
</ul>
<li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-count-integer-1">&lt;integer [1,∞]></a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-placement-int">&lt;integer> &amp;&amp; &lt;custom-ident>?</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-justify-inter-character">inter-character</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-scan-interlace">interlace</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-composite-intersect">intersect</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-justify-inter-word">inter-word</a>
<li>
invert
<ul>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-outline-color-invert">in css-ui-3, for outline-color</a>
<li><a href="https://www.w3.org/TR/CSS2/ui.html#value-def-invert">in css2</a>
</ul>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-unicode-bidi-isolate">isolate</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-unicode-bidi-isolate-override">isolate-override</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-style-italic">italic</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#japanese-formal">japanese-formal</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#japanese-informal">japanese-informal</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#valdef-steps-jump-both">jump-both</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#valdef-steps-jump-end">jump-end</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#valdef-steps-jump-none">jump-none</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#valdef-steps-jump-start">jump-start</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-justify">justify</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-justify-all">justify-all</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-kannada">kannada</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#katakana">katakana</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#katakana-iroha">katakana-iroha</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-word-break-keep-all">keep-all</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-name-keyframes-name">&lt;keyframes-name></a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-khmer">khmer</a>
<li><a href="https://drafts.csswg.org/css-values-3/#kHz">khz</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#korean-hangul-formal">korean-hangul-formal</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#korean-hanja-formal">korean-hanja-formal</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#korean-hanja-informal">korean-hanja-informal</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-orientation-landscape">landscape</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-lao">lao</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-size-large">large</a>
<li>
last
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-last-baseline">in css-align-3, for justify-self, justify-items, align-content, align-self, align-items, &lt;baseline-position></a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-hanging-punctuation-last">in css-text-3, for hanging-punctuation</a>
</ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-last-baseline">last baseline</a>
<li><a href="https://drafts.csswg.org/css-contain-1/#valdef-contain-layout">layout</a>
<li>
left
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-content-left">in css-align-3, for justify-content, justify-self, justify-items</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-position-left">in css-backgrounds-3, for background-position</a>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-left">in css-break-3, for break-before, break-after</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-balance-left">in css-speech-1, for voice-balance</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-left">in css-text-3, for text-align</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-emphasis-position-left">in css-text-decor-3, for text-emphasis-position</a>
<li><a href="https://www.w3.org/TR/css-text-decor-3/#valdef-text-text-emphasis-position-left">in css-text-decor-3, for text-text-emphasis-position</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#underline-left">in css-text-decor-3, for text-underline-position</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-origin-left">in css-transforms-1, for transform-origin</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-clear-left">in css2, for clear</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-float-left">in css2, for float</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-page-break-left">in css2, for page-break-before, page-break-after, page-break-inside</a>
</ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-balance-leftwards">leftwards</a>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-items-legacy">legacy</a>
<li>
&lt;length>
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-position-length">in css-backgrounds-3, for background-position</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-size-length">in css-images-3, for &lt;size></a>
<li><a href="https://www.w3.org/TR/css-shapes-1/#valuedef-length">in css-shapes-1, for shape-margin</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-letter-spacing-length">in css-text-3, for letter-spacing</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-indent-length">in css-text-3, for text-indent</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-word-spacing-length">in css-text-3, for word-spacing</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-border-width-length">in css2, for &lt;border-width>, border-top-width, border-right-width, border-bottom-wight, border-left-width, border-width</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-padding-width-length">in css2, for &lt;padding-width></a>
<li><a href="https://drafts.csswg.org/css2/#valdef-top-length">in css2, for top, right, bottom, left</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-vertical-align-length">in css2, for vertical-align</a>
</ul>
<li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-width-length-0">&lt;length [0,∞]></a>
<li>
&lt;length-percentage>
<ul>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-columns-length-percentage">in css-grid-1, for grid-template-columns, grid-template-rows</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-padding-length-percentage">in css-scroll-snap-1, for scroll-padding, scroll-padding-inline, scroll-padding-inline-start, scroll-padding-inline-end, scroll-padding-block, scroll-padding-block-start, scroll-padding-block-end</a>
<li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-margin-length-percentage">in css-shapes-1, for shape-margin</a>
</ul>
<li>
&lt;length-percentage [0,∞]>
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-size-length-percentage-0">in css-backgrounds-3, for background-size</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-width-length-percentage-0">in css-backgrounds-3, for border-image-width</a>
</ul>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-size-length-percentage2">&lt;length-percentage>{2}</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-lighten">lighten</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-weight-lighter">lighter</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-lime">lime</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#valdef-easing-function-linear">linear</a>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#valdef-color-interpolation-filters-linearrgb">linearrgb</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-ascii">[ &lt;line-names>? &lt;string> &lt;track-size>? &lt;line-names>? ]+ [ / &lt;explicit-track-list> ]?</a>
<li>
line-through
<ul>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-decoration-line-line-through">in css-text-decor-3, for text-decoration-line</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-text-decoration-line-through">in css2, for text-decoration</a>
</ul>
<li>
list-item
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-list-item">in css-display-3, for display, &lt;display-list-item></a>
<li><a href="https://www.w3.org/TR/CSS2/visuren.html#value-def-list-item">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-list-item">in css2, for display</a>
</ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-speak-as-literal-punctuation">literal-punctuation</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-attachment-local">local</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-line-break-loose">loose</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-volume-loud">loud</a>
<li>
low
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-pitch-low">in css-speech-1, for voice-pitch</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-range-low">in css-speech-1, for voice-range</a>
</ul>
<li>
lower-alpha
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#lower-alpha">in css-counter-styles-3, for &lt;counter-style-name></a>
<li><a href="https://drafts.csswg.org/css2/#velue-def-lower-alpha">in css2, for list-style-type</a>
</ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-lower-armenian">lower-armenian</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-transform-lowercase">lowercase</a>
<li>
lower-greek
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#lower-greek">in css-counter-styles-3, for &lt;counter-style-name></a>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-lower-greek">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-lower-greek">in css2, for list-style-type</a>
</ul>
<li>
lower-latin
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#lower-latin">in css-counter-styles-3, for &lt;counter-style-name></a>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-lower-latin">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-lower-latin">in css2, for list-style-type</a>
</ul>
<li>
lower-roman
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#lower-roman">in css-counter-styles-3, for &lt;counter-style-name></a>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-lower-roman">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-lower-roman">in css2, for list-style-type</a>
</ul>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-direction-ltr">ltr</a>
<li>
luminance
<ul>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-border-mode-luminance">in css-masking-1, for mask-border-mode</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-mode-luminance">in css-masking-1, for mask-mode</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-type-luminance">in css-masking-1, for mask-type</a>
</ul>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-luminosity">luminosity</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-malayalam">malayalam</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-family-male">male</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-type-mandatory">mandatory</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-hyphens-manual">manual</a>
<li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-box-margin-box">margin-box</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-maroon">maroon</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-match-parent">match-parent</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-mode-match-source">match-source</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-columns-max-content">max-content</a>
<li>
medium
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-width-medium">in css-backgrounds-3, for &lt;line-width>, border-width, border-top-width, border-left-width, border-bottom-width, border-right-width, border</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-pause-before-medium">in css-speech-1, for pause-before, pause-after</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-rest-before-medium">in css-speech-1, for rest-before, rest-after</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-pitch-medium">in css-speech-1, for voice-pitch</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-range-medium">in css-speech-1, for voice-range</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-rate-medium">in css-speech-1, for voice-rate</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-volume-medium">in css-speech-1, for voice-volume</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-border-width-medium">in css2, for &lt;border-width>, border-top-width, border-right-width, border-bottom-wight, border-left-width, border-width</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-size-medium">in css2, for font-size</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-menu">menu</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-message-box">message-box</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-vertical-align-middle">middle</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-columns-min-content">min-content</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-columns-minmax">minmax()</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-text-orientation-mixed">mixed</a>
<li><a href="https://drafts.csswg.org/css-values-3/#mm">mm</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-stress-moderate">moderate</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-mongolian">mongolian</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-generic-family-monospace">monospace</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-move">move</a>
<li><a href="https://drafts.csswg.org/css-values-3/#ms">ms</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-multiply">multiply</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-myanmar">myanmar</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-navy">navy</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-ne-resize">ne-resize</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-nesw-resize">nesw-resize</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-family-neutral">neutral</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-speak-never">never</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-clip-no-clip">no-clip</a>
<li>
no-close-quote
<ul>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-no-close-quote">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-no-close-quote">in css2, for content</a>
</ul>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-no-drop">no-drop</a>
<li>
none
<ul>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-fill-mode-none">in css-animations-1, for animation-fill-mode</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-name-none">in css-animations-1, for animation-name</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-none">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-image-none">in css-backgrounds-3, for background-image</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#box-shadow-none">in css-backgrounds-3, for box-shadow</a>
<li><a href="https://drafts.csswg.org/css-contain-1/#valdef-contain-none">in css-contain-1, for contain</a>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-none">in css-display-3, for display, &lt;display-box></a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-none">in css-flexbox-1, for flex</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-none">in css-grid-1, for grid-template</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-areas-none">in css-grid-1, for grid-template-areas</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-rows-none">in css-grid-1, for grid-template-rows, grid-template-columns</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-orientation-none">in css-images-3, for image-orientation</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-object-fit-none">in css-images-3, for object-fit</a>
<li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-span-none">in css-multicol-1, for column-span</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-align-none">in css-scroll-snap-1, for scroll-snap-align</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-type-none">in css-scroll-snap-1, for scroll-snap-type</a>
<li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-outside-none">in css-shapes-1, for shape-outside</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-pause-before-none">in css-speech-1, for pause-before, pause-after</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-rest-before-none">in css-speech-1, for rest-before, rest-after</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-stress-none">in css-speech-1, for voice-stress</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-hanging-punctuation-none">in css-text-3, for hanging-punctuation</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-hyphens-none">in css-text-3, for hyphens</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-justify-none">in css-text-3, for text-justify</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-transform-none">in css-text-3, for text-transform</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-decoration-line-none">in css-text-decor-3, for text-decoration-line</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-emphasis-style-none">in css-text-decor-3, for text-emphasis-style</a>
<li><a href="https://www.w3.org/TR/css-text-decor-3/#valdef-text-text-emphasis-style-none">in css-text-decor-3, for text-text-emphasis-style</a>
<li><a href="https://drafts.csswg.org/css-transitions-1/#valdef-transition-property-none">in css-transitions-1, for transition-property</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-none">in css-ui-3, for cursor</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-text-combine-upright-none">in css-writing-modes-4, for text-combine-upright</a>
<li><a href="https://www.w3.org/TR/CSS2/box.html#value-def-bo-none">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-bo-none">in css2, for &lt;border-style>, border-top-style, border-right-style, border-bottom-style, border-left-style, border-style</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-clear-none">in css2, for clear</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-content-none">in css2, for content</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-counter-reset-none">in css2, for counter-reset, counter-increment</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-display-none">in css2, for display</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-float-none">in css2, for float</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-list-style-type-none">in css2, for list-style-type</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-max-height-none">in css2, for max-height</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-max-width-none">in css2, for max-width</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-quotes-none">in css2, for quotes</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-text-decoration-none">in css2, for text-decoration</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-hover-none">in mediaqueries-4, for @media/hover</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-overflow-block-none">in mediaqueries-4, for @media/overflow-block</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-overflow-inline-none">in mediaqueries-4, for @media/overflow-inline</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-pointer-none">in mediaqueries-4, for @media/pointer</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-update-none">in mediaqueries-4, for @media/update</a>
</ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-none-value">none!!font-variant</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-clip-rule-nonzero">nonzero</a>
<li>
no-open-quote
<ul>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-no-open-quote">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-no-open-quote">in css2, for content</a>
</ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-speak-as-no-punctuation">no-punctuation</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-repeat-no-repeat">no-repeat</a>
<li>
normal
<ul>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-normal">in compositing-1, for &lt;blend-mode></a>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-align-self-normal">in css-align-3, for align-self</a>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-content-normal">in css-align-3, for justify-content, align-content</a>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-normal">in css-align-3, for justify-self</a>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-row-gap-normal">in css-align-3, for row-gap, column-gap, gap</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-direction-normal">in css-animations-1, for animation-direction</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-stop-normal">in css-scroll-snap-1, for scroll-snap-stop</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-speak-as-normal">in css-speech-1, for speak-as</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-rate-normal">in css-speech-1, for voice-rate</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-stress-normal">in css-speech-1, for voice-stress</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-letter-spacing-normal">in css-text-3, for letter-spacing</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-line-break-normal">in css-text-3, for line-break</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-overflow-wrap-normal">in css-text-3, for overflow-wrap</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-white-space-normal">in css-text-3, for white-space</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-word-break-normal">in css-text-3, for word-break</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-word-spacing-normal">in css-text-3, for word-spacing</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-unicode-bidi-normal">in css-writing-modes-4, for unicode-bidi</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-content-normal">in css2, for content</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-style-normal">in css2, for font-style</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-variant-normal">in css2, for font-variant</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-weight-normal">in css2, for font-weight</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-line-height-normal">in css2, for line-height</a>
</ul>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-feature-settings-normal-value">normal!!font-feature-settings</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-normal-value">normal!!font-variant</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-not">not</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-not-allowed">not-allowed</a>
<li>
nowrap
<ul>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-wrap-nowrap">in css-flexbox-1, for flex-wrap</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-white-space-nowrap">in css-text-3, for white-space</a>
</ul>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-n-resize">n-resize</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-ns-resize">ns-resize</a>
<li>
&lt;number>
<ul>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-iteration-count-number">in css-animations-1, for animation-iteration-count</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-grow-number">in css-flexbox-1, for flex-grow</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-shrink-number">in css-flexbox-1, for flex-shrink</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#aspect-ratio-value">in css-fonts-3, for font-size-adjust</a>
<li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-image-threshold-number">in css-shapes-1, for shape-image-threshold</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-balance-number">in css-speech-1, for voice-balance</a>
</ul>
<li>
&lt;number [0,∞]>
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-slice-number-0">in css-backgrounds-3, for border-image-slice</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-width-number-0">in css-backgrounds-3, for border-image-width</a>
</ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-speak-as-numbers">numbers</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-system-numeric">numeric</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-nw-resize">nw-resize</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-nwse-resize">nwse-resize</a>
<li>
objectboundingbox
<ul>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-clippathunits-objectboundingbox">in css-masking-1, for clipPathUnits</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-maskcontentunits-objectboundingbox">in css-masking-1, for maskContentUnits</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-maskunits-objectboundingbox">in css-masking-1, for maskUnits</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-style-oblique">oblique</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-family-old">old</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-olive">olive</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-only">only</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-text-emphasis-open">open</a>
<li>
open-quote
<ul>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-open-quote">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-open-quote">in css2, for content</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-orange">orange</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-oriya">oriya</a>
<li>
outset
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-outset">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
<li><a href="https://www.w3.org/TR/CSS2/box.html#value-def-outset">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-outset">in css2, for &lt;border-style>, border-top-style, border-right-style, border-bottom-style, border-left-style, border-style</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-list-style-position-outside">outside</a>
<li>
over
<ul>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-emphasis-position-over">in css-text-decor-3, for text-emphasis-position</a>
<li><a href="https://www.w3.org/TR/css-text-decor-3/#valdef-text-text-emphasis-position-over">in css-text-decor-3, for text-text-emphasis-position</a>
</ul>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-overlay">overlay</a>
<li>
overline
<ul>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-decoration-line-overline">in css-text-decor-3, for text-decoration-line</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-text-decoration-overline">in css2, for text-decoration</a>
</ul>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-color-gamut-p3">p3</a>
<li>
padding-box
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-clip-padding-box">in css-backgrounds-3, for background-clip</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-origin-padding-box">in css-backgrounds-3, for background-origin</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-clip-padding-box">in css-masking-1, for mask-clip</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-origin-padding-box">in css-masking-1, for mask-origin</a>
<li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-box-padding-box">in css-shapes-1, for &lt;shape-box>, shape-outside</a>
</ul>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-page">page</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-overflow-block-paged">paged</a>
<li><a href="https://drafts.csswg.org/css-contain-1/#valdef-contain-paint">paint</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-play-state-paused">paused</a>
<li><a href="https://drafts.csswg.org/css-values-3/#pc">pc</a>
<li>
&lt;percentage>
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-position-percentage">in css-backgrounds-3, for background-position</a>
<li><a href="https://www.w3.org/TR/css-shapes-1/#valuedef-percentage">in css-shapes-1, for shape-margin</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-pitch-percentage">in css-speech-1, for voice-pitch</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-range-percentage">in css-speech-1, for voice-range</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-rate-percentage">in css-speech-1, for voice-rate</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-indent-percentage">in css-text-3, for text-indent</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-padding-width-percentage">in css2, for &lt;padding-width></a>
<li><a href="https://drafts.csswg.org/css2/#valdef-top-percentage">in css2, for top, right, bottom, left</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-vertical-align-percentage">in css2, for vertical-align</a>
</ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-slice-percentage-0">&lt;percentage [0,∞]></a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-persian">persian</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-rendering-pixelated">pixelated</a>
<li><a href="https://www.w3.org/TR/css-values-3/#px">pixel unit</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-unicode-bidi-plaintext">plaintext</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-pointer">pointer</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-orientation-portrait">portrait</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-radial-gradient-position">&lt;position></a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre">pre</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre-line">pre-line</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-family-preserve">preserve</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre-wrap">pre-wrap</a>
<li>
print
<ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-media-print">in css2, for @media</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-print">in mediaqueries-4, for @media</a>
</ul>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-progress">progress</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-scan-progressive">progressive</a>
<li>
projection
<ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-media-projection">in css2, for @media</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-projection">in mediaqueries-4, for @media</a>
</ul>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-type-proximity">proximity</a>
<li><a href="https://drafts.csswg.org/css-values-3/#pt">pt</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-purple">purple</a>
<li><a href="https://drafts.csswg.org/css-values-3/#px">px</a>
<li><a href="https://drafts.csswg.org/css-values-3/#Q">q</a>
<li><a href="https://drafts.csswg.org/css-values-3/#rad">rad</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-color-gamut-rec2020">rec2020</a>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-recto">recto</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-red">red</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-stress-reduced">reduced</a>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-region">region</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-position-relative">relative</a>
<li><a href="https://drafts.csswg.org/css-values-3/#rem">rem</a>
<li>
repeat
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-repeat-repeat">in css-backgrounds-3, for background-repeat</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-repeat-repeat">in css-backgrounds-3, for border-image-repeat</a>
</ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-repeat-repeat-x">repeat-x</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-repeat-repeat-y">repeat-y</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-direction-reverse">reverse</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#valdef-all-revert">revert</a>
<li>
ridge
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-ridge">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
<li><a href="https://www.w3.org/TR/CSS2/box.html#value-def-ridge">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-ridge">in css2, for &lt;border-style>, border-top-style, border-right-style, border-bottom-style, border-left-style, border-style</a>
</ul>
<li>
right
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-content-right">in css-align-3, for justify-content, justify-self, justify-items</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-position-right">in css-backgrounds-3, for background-position</a>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-right">in css-break-3, for break-before, break-after</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-balance-right">in css-speech-1, for voice-balance</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-right">in css-text-3, for text-align</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-emphasis-position-right">in css-text-decor-3, for text-emphasis-position</a>
<li><a href="https://www.w3.org/TR/css-text-decor-3/#valdef-text-text-emphasis-position-right">in css-text-decor-3, for text-text-emphasis-position</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#underline-right">in css-text-decor-3, for text-underline-position</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-origin-right">in css-transforms-1, for transform-origin</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-clear-right">in css2, for clear</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-float-right">in css2, for float</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-page-break-right">in css2, for page-break-before, page-break-after, page-break-inside</a>
</ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-balance-rightwards">rightwards</a>
<li>
round
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-repeat-round">in css-backgrounds-3, for background-repeat</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-repeat-round">in css-backgrounds-3, for border-image-repeat</a>
</ul>
<li>
row
<ul>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-direction-row">in css-flexbox-1, for flex-direction</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-auto-flow-row">in css-grid-1, for grid-auto-flow</a>
</ul>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-row-resize">row-resize</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-direction-row-reverse">row-reverse</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-direction-rtl">rtl</a>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-ruby">ruby</a>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-ruby-base">ruby-base</a>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-ruby-base-container">ruby-base-container</a>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-ruby-text">ruby-text</a>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-ruby-text-container">ruby-text-container</a>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-run-in">run-in</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-play-state-running">running</a>
<li><a href="https://drafts.csswg.org/css-values-3/#s">s</a>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-overflow-position-safe">safe</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-generic-family-sans-serif">sans-serif</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-saturation">saturation</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-object-fit-scale-down">scale-down</a>
<li>
screen
<ul>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-screen">in compositing-1, for &lt;blend-mode></a>
<li><a href="https://drafts.csswg.org/css2/#valdef-media-screen">in css2, for @media</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-screen">in mediaqueries-4, for @media</a>
</ul>
<li>
scroll
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-attachment-scroll">in css-backgrounds-3, for background-attachment</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-overflow-scroll">in css2, for overflow</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-overflow-block-scroll">in mediaqueries-4, for @media/overflow-block</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-overflow-inline-scroll">in mediaqueries-4, for @media/overflow-inline</a>
</ul>
<li><a href="https://drafts.csswg.org/css-will-change-1/#valdef-will-change-scroll-position">scroll-position</a>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-self-position-self-end">self-end</a>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-self-position-self-start">self-start</a>
<li>
&lt;semitones>
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-pitch-semitones">in css-speech-1, for voice-pitch</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-range-semitones">in css-speech-1, for voice-range</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-border-collapse-separate">separate</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-se-resize">se-resize</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-generic-family-serif">serif</a>
<li>
sesame
<ul>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-emphasis-style-sesame">in css-text-decor-3, for text-emphasis-style</a>
<li><a href="https://www.w3.org/TR/css-text-decor-3/#valdef-text-text-emphasis-style-sesame">in css-text-decor-3, for text-text-emphasis-style</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-empty-cells-show">show</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-text-orientation-sideways">sideways</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-writing-mode-sideways-lr">sideways-lr</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-text-orientation-sideways-right">sideways-right</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-writing-mode-sideways-rl">sideways-rl</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-volume-silent">silent</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-silver">silver</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#simp-chinese-formal">simp-chinese-formal</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#simp-chinese-informal">simp-chinese-informal</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-radial-gradient-size">&lt;size></a>
<li><a href="https://drafts.csswg.org/css-contain-1/#valdef-contain-size">size</a>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-box-decoration-break-slice">slice</a>
<li>
slow
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-rate-slow">in css-speech-1, for voice-rate</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-update-slow">in mediaqueries-4, for @media/update</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-size-small">small</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-style-small-caps">small-caps</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-small-caption">small-caption</a>
<li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-rendering-smooth">smooth</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-volume-soft">soft</a>
<li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-soft-light">soft-light</a>
<li>
solid
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-solid">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
<li><a href="https://www.w3.org/TR/CSS2/box.html#value-def-solid">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-solid">in css2, for &lt;border-style>, border-top-style, border-right-style, border-bottom-style, border-left-style, border-style</a>
</ul>
<li>
space
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-repeat-space">in css-backgrounds-3, for background-repeat</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-repeat-space">in css-backgrounds-3, for border-image-repeat</a>
</ul>
<li>
space-around
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-align-content-space-around">in css-align-3, for align-content, justify-content, &lt;content-distribution></a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-content-space-around">in css-flexbox-1, for align-content</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-justify-content-space-around">in css-flexbox-1, for justify-content</a>
</ul>
<li>
space-between
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-align-content-space-between">in css-align-3, for align-content, justify-content, &lt;content-distribution></a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-content-space-between">in css-flexbox-1, for align-content</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-justify-content-space-between">in css-flexbox-1, for justify-content</a>
</ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-align-content-space-evenly">space-evenly</a>
<li><a href="https://drafts.csswg.org/css-grid-1/#grid-placement-span-int">span &amp;&amp; [ &lt;integer> || &lt;custom-ident> ]</a>
<li>
speech
<ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-media-speech">in css2, for @media</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-speech">in mediaqueries-4, for @media</a>
</ul>
<li>
spell-out
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-speak-as-spell-out">in css-counter-styles-3, for @counter-style/speak-as</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-speak-as-spell-out">in css-speech-1, for speak-as</a>
</ul>
<li>
square
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#square">in css-counter-styles-3, for &lt;counter-style-name></a>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-square">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-square">in css2, for list-style-type</a>
</ul>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-s-resize">s-resize</a>
<li>
srgb
<ul>
<li><a href="https://drafts.fxtf.org/filter-effects-1/#valdef-color-interpolation-filters-srgb">in filter-effects-1, for color-interpolation-filters</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-color-gamut-srgb">in mediaqueries-4, for @media/color-gamut</a>
</ul>
<li>
start
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-self-position-start">in css-align-3, for &lt;self-position>, &lt;content-position>, justify-self, align-self, justify-content, align-content</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#valdef-steps-start">in css-easing-1, for steps()</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-align-start">in css-scroll-snap-1, for scroll-snap-align</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-start">in css-text-3, for text-align</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-position-static">static</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-status-bar">status-bar</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#valdef-step-easing-function-step-end">step-end</a>
<li><a href="https://drafts.csswg.org/css-easing-1/#valdef-step-easing-function-step-start">step-start</a>
<li>
stretch
<ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-align-content-stretch">in css-align-3, for align-content, justify-content, &lt;content-distribution></a>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-align-self-stretch">in css-align-3, for align-self</a>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-stretch">in css-align-3, for justify-self</a>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-repeat-stretch">in css-backgrounds-3, for border-image-repeat</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-content-stretch">in css-flexbox-1, for align-content</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-items-stretch">in css-flexbox-1, for align-items, align-self</a>
</ul>
<li>
strict
<ul>
<li><a href="https://drafts.csswg.org/css-contain-1/#valdef-contain-strict">in css-contain-1, for contain</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-line-break-strict">in css-text-3, for line-break</a>
</ul>
<li>
&lt;string>
<ul>
<li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-path-string">in css-shapes-1, for path()</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-emphasis-style-string">in css-text-decor-3, for text-emphasis-style</a>
<li><a href="https://www.w3.org/TR/css-text-decor-3/#valdef-text-text-emphasis-style-string">in css-text-decor-3, for text-text-emphasis-style</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-content-string">in css2, for content</a>
</ul>
<li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-areas-string">&lt;string>+</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-quotes-strings">[&lt;string> &lt;string>]+</a>
<li>
stroke-box
<ul>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-clip-path-stroke-box">in css-masking-1, for clip-path</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-clip-stroke-box">in css-masking-1, for mask-clip</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-origin-stroke-box">in css-masking-1, for mask-origin</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-box-stroke-box">in css-transforms-1, for transform-box</a>
</ul>
<li>
strong
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-pause-before-strong">in css-speech-1, for pause-before, pause-after</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-rest-before-strong">in css-speech-1, for rest-before, rest-after</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-stress-strong">in css-speech-1, for voice-stress</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-vertical-align-sub">sub</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-composite-subtract">subtract</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-vertical-align-super">super</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-sw-resize">sw-resize</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-system-symbolic">symbolic</a>
<li>
table
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-table">in css-display-3, for display, &lt;display-inside></a>
<li><a href="https://www.w3.org/TR/CSS2/tables.html#value-def-table">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-table">in css2, for display</a>
</ul>
<li>
table-caption
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-table-caption">in css-display-3, for display, &lt;display-internal></a>
<li><a href="https://www.w3.org/TR/CSS2/tables.html#value-def-table-caption">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-table-caption">in css2, for display</a>
</ul>
<li>
table-cell
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-table-cell">in css-display-3, for display, &lt;display-internal></a>
<li><a href="https://www.w3.org/TR/CSS2/tables.html#value-def-table-cell">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-table-cell">in css2, for display</a>
</ul>
<li>
table-column
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-table-column">in css-display-3, for display, &lt;display-internal></a>
<li><a href="https://www.w3.org/TR/CSS2/tables.html#value-def-table-column">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-table-column">in css2, for display</a>
</ul>
<li>
table-column-group
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-table-column-group">in css-display-3, for display, &lt;display-internal></a>
<li><a href="https://www.w3.org/TR/CSS2/tables.html#value-def-table-column-group">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-table-column-group">in css2, for display</a>
</ul>
<li>
table-footer-group
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-table-footer-group">in css-display-3, for display, &lt;display-internal></a>
<li><a href="https://www.w3.org/TR/CSS2/tables.html#value-def-table-footer-group">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-table-footer-group">in css2, for display</a>
</ul>
<li>
table-header-group
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-table-header-group">in css-display-3, for display, &lt;display-internal></a>
<li><a href="https://www.w3.org/TR/CSS2/tables.html#value-def-table-header-group">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-table-header-group">in css2, for display</a>
</ul>
<li>
table-row
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-table-row">in css-display-3, for display, &lt;display-internal></a>
<li><a href="https://www.w3.org/TR/CSS2/tables.html#value-def-table-row">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-table-row">in css2, for display</a>
</ul>
<li>
table-row-group
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-display-table-row-group">in css-display-3, for display, &lt;display-internal></a>
<li><a href="https://www.w3.org/TR/CSS2/tables.html#value-def-table-row-group">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-table-row-group">in css2, for display</a>
</ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-tamil">tamil</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-teal">teal</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-telugu">telugu</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-text">text</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-vertical-align-text-bottom">text-bottom</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-vertical-align-text-top">text-top</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-thai">thai</a>
<li>
thick
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-width-thick">in css-backgrounds-3, for &lt;line-width>, border-width, border-top-width, border-left-width, border-bottom-width, border-right-width, border</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-border-width-thick">in css2, for &lt;border-width>, border-top-width, border-right-width, border-bottom-wight, border-left-width, border-width</a>
</ul>
<li>
thin
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-width-thin">in css-backgrounds-3, for &lt;line-width>, border-width, border-top-width, border-left-width, border-bottom-width, border-right-width, border</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-border-width-thin">in css2, for &lt;border-width>, border-top-width, border-right-width, border-bottom-wight, border-left-width, border-width</a>
</ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-tibetan">tibetan</a>
<li>
&lt;time>
<ul>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-delay-time">in css-animations-1, for animation-delay</a>
<li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-duration-time">in css-animations-1, for animation-duration</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-pause-before-time">in css-speech-1, for pause-before, pause-after</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-rest-before-time">in css-speech-1, for rest-before, rest-after</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-duration-time">in css-speech-1, for voice-duration</a>
</ul>
<li>
top
<ul>
<li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-position-top">in css-backgrounds-3, for background-position</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-origin-top">in css-transforms-1, for transform-origin</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-caption-side-top">in css2, for caption-side</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-vertical-align-top">in css2, for vertical-align</a>
</ul>
<li><a href="https://drafts.csswg.org/css-grid-1/#track-listing">&lt;track-list> | &lt;auto-track-list></a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#trad-chinese-formal">trad-chinese-formal</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#trad-chinese-informal">trad-chinese-informal</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-border-color-transparent">transparent</a>
<li>
triangle
<ul>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-emphasis-style-triangle">in css-text-decor-3, for text-emphasis-style</a>
<li><a href="https://www.w3.org/TR/css-text-decor-3/#valdef-text-text-emphasis-style-triangle">in css-text-decor-3, for text-text-emphasis-style</a>
</ul>
<li>
tty
<ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-media-tty">in css2, for @media</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-tty">in mediaqueries-4, for @media</a>
</ul>
<li><a href="https://drafts.csswg.org/css-values-3/#turn">turn</a>
<li>
tv
<ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-media-tv">in css2, for @media</a>
<li><a href="https://drafts.csswg.org/mediaqueries-4/#valdef-media-tv">in mediaqueries-4, for @media</a>
</ul>
<li>
under
<ul>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-emphasis-position-under">in css-text-decor-3, for text-emphasis-position</a>
<li><a href="https://www.w3.org/TR/css-text-decor-3/#valdef-text-text-emphasis-position-under">in css-text-decor-3, for text-text-emphasis-position</a>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#underline-under">in css-text-decor-3, for text-underline-position</a>
</ul>
<li>
underline
<ul>
<li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-decoration-line-underline">in css-text-decor-3, for text-decoration-line</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-text-decoration-underline">in css2, for text-decoration</a>
</ul>
<li><a href="https://drafts.csswg.org/css-align-3/#valdef-overflow-position-unsafe">unsafe</a>
<li><a href="https://drafts.csswg.org/css-cascade-4/#valdef-all-unset">unset</a>
<li>
upper-alpha
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#upper-alpha">in css-counter-styles-3, for &lt;counter-style-name></a>
<li><a href="https://drafts.csswg.org/css2/#value-def-upper-alpha">in css2, for list-style-type</a>
</ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-upper-armenian">upper-armenian</a>
<li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-transform-uppercase">uppercase</a>
<li>
upper-latin
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#upper-latin">in css-counter-styles-3, for &lt;counter-style-name></a>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-upper-latin">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-upper-latin">in css2, for list-style-type</a>
</ul>
<li>
upper-roman
<ul>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#upper-roman">in css-counter-styles-3, for &lt;counter-style-name></a>
<li><a href="https://www.w3.org/TR/CSS2/generate.html#value-def-upper-roman">in css2</a>
<li><a href="https://drafts.csswg.org/css2/#value-def-upper-roman">in css2, for list-style-type</a>
</ul>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-text-orientation-upright">upright</a>
<li><a href="https://drafts.csswg.org/css-fonts-3/#urange-value">&lt;urange></a>
<li>
&lt;uri>
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-cue-before-uri">in css-speech-1, for cue-before, cue-after</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-background-image-uri">in css2, for background-image</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-content-uri">in css2, for content</a>
</ul>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-image-url">&lt;url></a>
<li>
userspaceonuse
<ul>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-clippathunits-userspaceonuse">in css-masking-1, for clipPathUnits</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-maskcontentunits-userspaceonuse">in css-masking-1, for maskContentUnits</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-maskunits-userspaceonuse">in css-masking-1, for maskUnits</a>
</ul>
<li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-verso">verso</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-writing-mode-vertical-lr">vertical-lr</a>
<li><a href="https://drafts.csswg.org/css-writing-modes-4/#valdef-writing-mode-vertical-rl">vertical-rl</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-vertical-text">vertical-text</a>
<li><a href="https://drafts.csswg.org/css-values-3/#vh">vh</a>
<li>
view-box
<ul>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-clip-path-view-box">in css-masking-1, for clip-path</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-clip-view-box">in css-masking-1, for mask-clip</a>
<li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-origin-view-box">in css-masking-1, for mask-origin</a>
<li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-box-view-box">in css-transforms-1, for transform-box</a>
</ul>
<li>
visible
<ul>
<li><a href="https://drafts.csswg.org/css-display-3/#valdef-visibility-visible">in css-display-3, for visibility</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-overflow-visible">in css2, for overflow</a>
</ul>
<li><a href="https://drafts.csswg.org/css-values-3/#vmax">vmax</a>
<li><a href="https://drafts.csswg.org/css-values-3/#vmin">vmin</a>
<li><a href="https://drafts.csswg.org/css-values-3/#vw">vw</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-wait">wait</a>
<li>
weak
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-pause-before-weak">in css-speech-1, for pause-before, pause-after</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-rest-before-weak">in css-speech-1, for rest-before, rest-after</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-white">white</a>
<li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-speak-as-words">words</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-wrap-wrap">wrap</a>
<li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-wrap-wrap-reverse">wrap-reverse</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-w-resize">w-resize</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-type-x">x</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-rate-x-fast">x-fast</a>
<li>
x-high
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-pitch-x-high">in css-speech-1, for voice-pitch</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-range-x-high">in css-speech-1, for voice-range</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-size-x-large">x-large</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-volume-x-loud">x-loud</a>
<li>
x-low
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-pitch-x-low">in css-speech-1, for voice-pitch</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-range-x-low">in css-speech-1, for voice-range</a>
</ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-rate-x-slow">x-slow</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-size-x-small">x-small</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-volume-x-soft">x-soft</a>
<li>
x-strong
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-pause-before-x-strong">in css-speech-1, for pause-before, pause-after</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-rest-before-x-strong">in css-speech-1, for rest-before, rest-after</a>
</ul>
<li>
x-weak
<ul>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-pause-before-x-weak">in css-speech-1, for pause-before, pause-after</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-rest-before-x-weak">in css-speech-1, for rest-before, rest-after</a>
</ul>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-size-xx-large">xx-large</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-font-size-xx-small">xx-small</a>
<li><a href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-type-y">y</a>
<li><a href="https://drafts.csswg.org/css2/#valdef-color-yellow">yellow</a>
<li><a href="https://drafts.csswg.org/css-speech-1/#valdef-voice-family-young">young</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-zoom-in">zoom-in</a>
<li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-zoom-out">zoom-out</a>
</ul>
</div>
<h2 class="heading settled" data-level="6" id="acks"><span class="secno">6. </span><span class="content">Acknowledgements</span><a class="self-link" href="#acks"></a></h2>
<p>Special thanks to Florian Rivoal for creating the initial draft of the <a href="#experimental">§3.2.1 Experimentation and Unstable Features</a> recommendations.</p>
</main>
<h2 class="no-ref no-num heading settled" id="w3c-conformance"><span class="content"> Conformance</span><a class="self-link" href="#w3c-conformance"></a></h2>
<h3 class="no-ref heading settled" id="w3c-conventions"><span class="content"> Document conventions</span><a class="self-link" href="#w3c-conventions"></a></h3>
<p>Conformance requirements are expressed with a combination of
descriptive assertions and RFC 2119 terminology. The key words “MUST”,
“MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”,
“RECOMMENDED”, “MAY”, and “OPTIONAL” in the normative parts of this
document are to be interpreted as described in RFC 2119.
However, for readability, these words do not appear in all uppercase
letters in this specification. </p>
<p>All of the text of this specification is normative except sections
explicitly marked as non-normative, examples, and notes. <a data-link-type="biblio" href="#biblio-rfc2119">[RFC2119]</a></p>
<p>Examples in this specification are introduced with the words “for example”
or are set apart from the normative text with <code>class="example"</code>,
like this: </p>
<div class="example" id="w3c-example">
<a class="self-link" href="#w3c-example"></a>
<p>This is an example of an informative example.</p>
</div>
<p>Informative notes begin with the word “Note” and are set apart from the
normative text with <code>class="note"</code>, like this: </p>
<p class="note" role="note">Note, this is an informative note.</p>
<p>Advisements are normative sections styled to evoke special attention and are
set apart from other normative text with <code>&lt;strong class="advisement"></code>, like
this: <strong class="advisement"> UAs MUST provide an accessible alternative. </strong> </p>
<h3 class="no-ref heading settled" id="w3c-conformance-classes"><span class="content"> Conformance classes</span><a class="self-link" href="#w3c-conformance-classes"></a></h3>
<p>Conformance to this specification
is defined for three conformance classes: </p>
<dl>
<dt>style sheet
<dd>A <a href="https://www.w3.org/TR/CSS21/conform.html#style-sheet">CSS
style sheet</a>.
<dt>renderer
<dd>A <a href="https://www.w3.org/TR/CSS21/conform.html#user-agent">UA</a> that interprets the semantics of a style sheet and renders
documents that use them.
<dt>authoring tool
<dd>A <a href="https://www.w3.org/TR/CSS21/conform.html#user-agent">UA</a> that writes a style sheet.
</dl>
<p>A style sheet is conformant to this specification
if all of its statements that use syntax defined in this module are valid
according to the generic CSS grammar and the individual grammars of each
feature defined in this module. </p>
<p>A renderer is conformant to this specification
if, in addition to interpreting the style sheet as defined by the
appropriate specifications, it supports all the features defined
by this specification by parsing them correctly
and rendering the document accordingly. However, the inability of a
UA to correctly render a document due to limitations of the device
does not make the UA non-conformant. (For example, a UA is not
required to render color on a monochrome monitor.) </p>
<p>An authoring tool is conformant to this specification
if it writes style sheets that are syntactically correct according to the
generic CSS grammar and the individual grammars of each feature in
this module, and meet all other conformance requirements of style sheets
as described in this module. </p>
<h3 class="no-ref heading settled" id="w3c-partial"><span class="content"> Partial implementations</span><a class="self-link" href="#w3c-partial"></a></h3>
<p>So that authors can exploit the forward-compatible parsing rules to
assign fallback values, CSS renderers <strong>must</strong> treat as invalid (and <a href="https://www.w3.org/TR/CSS21/conform.html#ignore">ignore
as appropriate</a>) any at-rules, properties, property values, keywords,
and other syntactic constructs for which they have no usable level of
support. In particular, user agents <strong>must not</strong> selectively
ignore unsupported component values and honor supported values in a single
multi-value property declaration: if any value is considered invalid
(as unsupported values must be), CSS requires that the entire declaration
be ignored.</p>
<h4 class="heading settled" id="w3c-conform-future-proofing"><span class="content"> Implementations of Unstable and Proprietary Features</span><a class="self-link" href="#w3c-conform-future-proofing"></a></h4>
<p>To avoid clashes with future stable CSS features,
the CSSWG recommends <a href="https://www.w3.org/TR/CSS/#future-proofing">following best practices</a> for the implementation of <a href="https://www.w3.org/TR/CSS/#unstable">unstable</a> features and <a href="https://www.w3.org/TR/CSS/#proprietary-extension">proprietary extensions</a> to CSS. </p>
<h3 class="no-ref heading settled" id="w3c-testing"><span class="content"> Non-experimental implementations</span><a class="self-link" href="#w3c-testing"></a></h3>
<p>Once a specification reaches the Candidate Recommendation stage,
non-experimental implementations are possible, and implementors should
release an unprefixed implementation of any CR-level feature they
can demonstrate to be correctly implemented according to spec. </p>
<p>To establish and maintain the interoperability of CSS across
implementations, the CSS Working Group requests that non-experimental
CSS renderers submit an implementation report (and, if necessary, the
testcases used for that implementation report) to the W3C before
releasing an unprefixed implementation of any CSS features. Testcases
submitted to W3C are subject to review and correction by the CSS
Working Group. </p>
<p>Further information on submitting testcases and implementation reports
can be found from on the CSS Working Groups website at <a href="https://www.w3.org/Style/CSS/Test/">https://www.w3.org/Style/CSS/Test/</a>.
Questions should be directed to the <a href="https://lists.w3.org/Archives/Public/public-css-testsuite">public-css-testsuite@w3.org</a> mailing list.</p>
<script src="https://www.w3.org/scripts/TR/2021/fixup.js"></script>
<h2 class="no-num no-ref heading settled" id="references"><span class="content">References</span><a class="self-link" href="#references"></a></h2>
<h3 class="no-num no-ref heading settled" id="normative"><span class="content">Normative References</span><a class="self-link" href="#normative"></a></h3>
<dl>
<dt id="biblio-compositing">[COMPOSITING]
<dd>Rik Cabanier; Nikos Andronikos. <a href="https://www.w3.org/TR/compositing-1/"><cite>Compositing and Blending Level 1</cite></a>. 13 January 2015. CR. URL: <a href="https://www.w3.org/TR/compositing-1/">https://www.w3.org/TR/compositing-1/</a>
<dt id="biblio-css-backgrounds-3">[CSS-BACKGROUNDS-3]
<dd>Bert Bos; Elika Etemad; Brad Kemper. <a href="https://www.w3.org/TR/css-backgrounds-3/"><cite>CSS Backgrounds and Borders Module Level 3</cite></a>. 26 July 2021. CR. URL: <a href="https://www.w3.org/TR/css-backgrounds-3/">https://www.w3.org/TR/css-backgrounds-3/</a>
<dt id="biblio-css-box-3">[CSS-BOX-3]
<dd>Elika Etemad. <a href="https://www.w3.org/TR/css-box-3/"><cite>CSS Box Model Module Level 3</cite></a>. 22 December 2020. CR. URL: <a href="https://www.w3.org/TR/css-box-3/">https://www.w3.org/TR/css-box-3/</a>
<dt id="biblio-css-cascade-4">[CSS-CASCADE-4]
<dd>Elika Etemad; Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-cascade-4/"><cite>CSS Cascading and Inheritance Level 4</cite></a>. 3 December 2021. WD. URL: <a href="https://www.w3.org/TR/css-cascade-4/">https://www.w3.org/TR/css-cascade-4/</a>
<dt id="biblio-css-color-3">[CSS-COLOR-3]
<dd>Tantek Çelik; Chris Lilley; David Baron. <a href="https://www.w3.org/TR/css-color-3/"><cite>CSS Color Module Level 3</cite></a>. 5 August 2021. REC. URL: <a href="https://www.w3.org/TR/css-color-3/">https://www.w3.org/TR/css-color-3/</a>
<dt id="biblio-css-color-4">[CSS-COLOR-4]
<dd>Tab Atkins Jr.; Chris Lilley; Lea Verou. <a href="https://www.w3.org/TR/css-color-4/"><cite>CSS Color Module Level 4</cite></a>. 15 December 2021. WD. URL: <a href="https://www.w3.org/TR/css-color-4/">https://www.w3.org/TR/css-color-4/</a>
<dt id="biblio-css-color-adjust-1">[CSS-COLOR-ADJUST-1]
<dd>Elika Etemad; et al. <a href="https://www.w3.org/TR/css-color-adjust-1/"><cite>CSS Color Adjustment Module Level 1</cite></a>. 16 June 2021. WD. URL: <a href="https://www.w3.org/TR/css-color-adjust-1/">https://www.w3.org/TR/css-color-adjust-1/</a>
<dt id="biblio-css-conditional-3">[CSS-CONDITIONAL-3]
<dd>David Baron; Elika Etemad; Chris Lilley. <a href="https://www.w3.org/TR/css-conditional-3/"><cite>CSS Conditional Rules Module Level 3</cite></a>. 23 December 2021. CR. URL: <a href="https://www.w3.org/TR/css-conditional-3/">https://www.w3.org/TR/css-conditional-3/</a>
<dt id="biblio-css-contain-1">[CSS-CONTAIN-1]
<dd>Tab Atkins Jr.; Florian Rivoal. <a href="https://www.w3.org/TR/css-contain-1/"><cite>CSS Containment Module Level 1</cite></a>. 22 December 2020. REC. URL: <a href="https://www.w3.org/TR/css-contain-1/">https://www.w3.org/TR/css-contain-1/</a>
<dt id="biblio-css-counter-styles-3">[CSS-COUNTER-STYLES-3]
<dd>Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-counter-styles-3/"><cite>CSS Counter Styles Level 3</cite></a>. 27 July 2021. CR. URL: <a href="https://www.w3.org/TR/css-counter-styles-3/">https://www.w3.org/TR/css-counter-styles-3/</a>
<dt id="biblio-css-display-3">[CSS-DISPLAY-3]
<dd>Tab Atkins Jr.; Elika Etemad. <a href="https://www.w3.org/TR/css-display-3/"><cite>CSS Display Module Level 3</cite></a>. 3 September 2021. CR. URL: <a href="https://www.w3.org/TR/css-display-3/">https://www.w3.org/TR/css-display-3/</a>
<dt id="biblio-css-easing-1">[CSS-EASING-1]
<dd>Brian Birtles; et al. <a href="https://www.w3.org/TR/css-easing-1/"><cite>CSS Easing Functions Level 1</cite></a>. 1 April 2021. CR. URL: <a href="https://www.w3.org/TR/css-easing-1/">https://www.w3.org/TR/css-easing-1/</a>
<dt id="biblio-css-flexbox-1">[CSS-FLEXBOX-1]
<dd>Tab Atkins Jr.; et al. <a href="https://www.w3.org/TR/css-flexbox-1/"><cite>CSS Flexible Box Layout Module Level 1</cite></a>. 19 November 2018. CR. URL: <a href="https://www.w3.org/TR/css-flexbox-1/">https://www.w3.org/TR/css-flexbox-1/</a>
<dt id="biblio-css-fonts-3">[CSS-FONTS-3]
<dd>John Daggett; Myles Maxfield; Chris Lilley. <a href="https://www.w3.org/TR/css-fonts-3/"><cite>CSS Fonts Module Level 3</cite></a>. 20 September 2018. REC. URL: <a href="https://www.w3.org/TR/css-fonts-3/">https://www.w3.org/TR/css-fonts-3/</a>
<dt id="biblio-css-fonts-4">[CSS-FONTS-4]
<dd>John Daggett; Myles Maxfield; Chris Lilley. <a href="https://www.w3.org/TR/css-fonts-4/"><cite>CSS Fonts Module Level 4</cite></a>. 21 December 2021. WD. URL: <a href="https://www.w3.org/TR/css-fonts-4/">https://www.w3.org/TR/css-fonts-4/</a>
<dt id="biblio-css-grid-1">[CSS-GRID-1]
<dd>Tab Atkins Jr.; et al. <a href="https://www.w3.org/TR/css-grid-1/"><cite>CSS Grid Layout Module Level 1</cite></a>. 18 December 2020. CR. URL: <a href="https://www.w3.org/TR/css-grid-1/">https://www.w3.org/TR/css-grid-1/</a>
<dt id="biblio-css-grid-2">[CSS-GRID-2]
<dd>Tab Atkins Jr.; Elika Etemad; Rossen Atanassov. <a href="https://www.w3.org/TR/css-grid-2/"><cite>CSS Grid Layout Module Level 2</cite></a>. 18 December 2020. CR. URL: <a href="https://www.w3.org/TR/css-grid-2/">https://www.w3.org/TR/css-grid-2/</a>
<dt id="biblio-css-images-3">[CSS-IMAGES-3]
<dd>Tab Atkins Jr.; Elika Etemad; Lea Verou. <a href="https://www.w3.org/TR/css-images-3/"><cite>CSS Images Module Level 3</cite></a>. 17 December 2020. CR. URL: <a href="https://www.w3.org/TR/css-images-3/">https://www.w3.org/TR/css-images-3/</a>
<dt id="biblio-css-images-4">[CSS-IMAGES-4]
<dd>Tab Atkins Jr.; Elika Etemad; Lea Verou. <a href="https://www.w3.org/TR/css-images-4/"><cite>CSS Image Values and Replaced Content Module Level 4</cite></a>. 13 April 2017. WD. URL: <a href="https://www.w3.org/TR/css-images-4/">https://www.w3.org/TR/css-images-4/</a>
<dt id="biblio-css-lists-3">[CSS-LISTS-3]
<dd>Elika Etemad; Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-lists-3/"><cite>CSS Lists and Counters Module Level 3</cite></a>. 17 November 2020. WD. URL: <a href="https://www.w3.org/TR/css-lists-3/">https://www.w3.org/TR/css-lists-3/</a>
<dt id="biblio-css-logical-1">[CSS-LOGICAL-1]
<dd>Rossen Atanassov; Elika Etemad. <a href="https://www.w3.org/TR/css-logical-1/"><cite>CSS Logical Properties and Values Level 1</cite></a>. 27 August 2018. WD. URL: <a href="https://www.w3.org/TR/css-logical-1/">https://www.w3.org/TR/css-logical-1/</a>
<dt id="biblio-css-multicol-1">[CSS-MULTICOL-1]
<dd>Florian Rivoal; Rachel Andrew. <a href="https://www.w3.org/TR/css-multicol-1/"><cite>CSS Multi-column Layout Module Level 1</cite></a>. 12 October 2021. CR. URL: <a href="https://www.w3.org/TR/css-multicol-1/">https://www.w3.org/TR/css-multicol-1/</a>
<dt id="biblio-css-position-3">[CSS-POSITION-3]
<dd>Elika Etemad; Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-position-3/"><cite>CSS Positioned Layout Module Level 3</cite></a>. 16 December 2021. WD. URL: <a href="https://www.w3.org/TR/css-position-3/">https://www.w3.org/TR/css-position-3/</a>
<dt id="biblio-css-sizing-3">[CSS-SIZING-3]
<dd>Tab Atkins Jr.; Elika Etemad. <a href="https://www.w3.org/TR/css-sizing-3/"><cite>CSS Box Sizing Module Level 3</cite></a>. 17 December 2021. WD. URL: <a href="https://www.w3.org/TR/css-sizing-3/">https://www.w3.org/TR/css-sizing-3/</a>
<dt id="biblio-css-sizing-4">[CSS-SIZING-4]
<dd>Tab Atkins Jr.; Elika Etemad; Jen Simmons. <a href="https://www.w3.org/TR/css-sizing-4/"><cite>CSS Box Sizing Module Level 4</cite></a>. 20 May 2021. WD. URL: <a href="https://www.w3.org/TR/css-sizing-4/">https://www.w3.org/TR/css-sizing-4/</a>
<dt id="biblio-css-style-attr">[CSS-STYLE-ATTR]
<dd>Tantek Çelik; Elika Etemad. <a href="https://www.w3.org/TR/css-style-attr/"><cite>CSS Style Attributes</cite></a>. 7 November 2013. REC. URL: <a href="https://www.w3.org/TR/css-style-attr/">https://www.w3.org/TR/css-style-attr/</a>
<dt id="biblio-css-syntax-3">[CSS-SYNTAX-3]
<dd>Tab Atkins Jr.; Simon Sapin. <a href="https://www.w3.org/TR/css-syntax-3/"><cite>CSS Syntax Module Level 3</cite></a>. 24 December 2021. CR. URL: <a href="https://www.w3.org/TR/css-syntax-3/">https://www.w3.org/TR/css-syntax-3/</a>
<dt id="biblio-css-transforms-1">[CSS-TRANSFORMS-1]
<dd>Simon Fraser; et al. <a href="https://www.w3.org/TR/css-transforms-1/"><cite>CSS Transforms Module Level 1</cite></a>. 14 February 2019. CR. URL: <a href="https://www.w3.org/TR/css-transforms-1/">https://www.w3.org/TR/css-transforms-1/</a>
<dt id="biblio-css-transforms-2">[CSS-TRANSFORMS-2]
<dd>Tab Atkins Jr.; et al. <a href="https://www.w3.org/TR/css-transforms-2/"><cite>CSS Transforms Module Level 2</cite></a>. 9 November 2021. WD. URL: <a href="https://www.w3.org/TR/css-transforms-2/">https://www.w3.org/TR/css-transforms-2/</a>
<dt id="biblio-css-ui-3">[CSS-UI-3]
<dd>Tantek Çelik; Florian Rivoal. <a href="https://www.w3.org/TR/css-ui-3/"><cite>CSS Basic User Interface Module Level 3 (CSS3 UI)</cite></a>. 21 June 2018. REC. URL: <a href="https://www.w3.org/TR/css-ui-3/">https://www.w3.org/TR/css-ui-3/</a>
<dt id="biblio-css-values-3">[CSS-VALUES-3]
<dd>Tab Atkins Jr.; Elika Etemad. <a href="https://www.w3.org/TR/css-values-3/"><cite>CSS Values and Units Module Level 3</cite></a>. 6 June 2019. CR. URL: <a href="https://www.w3.org/TR/css-values-3/">https://www.w3.org/TR/css-values-3/</a>
<dt id="biblio-css-variables-1">[CSS-VARIABLES-1]
<dd>Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-variables-1/"><cite>CSS Custom Properties for Cascading Variables Module Level 1</cite></a>. 11 November 2021. CR. URL: <a href="https://www.w3.org/TR/css-variables-1/">https://www.w3.org/TR/css-variables-1/</a>
<dt id="biblio-css-will-change-1">[CSS-WILL-CHANGE-1]
<dd>Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-will-change-1/"><cite>CSS Will Change Module Level 1</cite></a>. 3 December 2015. CR. URL: <a href="https://www.w3.org/TR/css-will-change-1/">https://www.w3.org/TR/css-will-change-1/</a>
<dt id="biblio-css-writing-modes-3">[CSS-WRITING-MODES-3]
<dd>Elika Etemad; Koji Ishii. <a href="https://www.w3.org/TR/css-writing-modes-3/"><cite>CSS Writing Modes Level 3</cite></a>. 10 December 2019. REC. URL: <a href="https://www.w3.org/TR/css-writing-modes-3/">https://www.w3.org/TR/css-writing-modes-3/</a>
<dt id="biblio-css2">[CSS2]
<dd>Bert Bos; et al. <a href="https://www.w3.org/TR/CSS21/"><cite>Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification</cite></a>. 7 June 2011. REC. URL: <a href="https://www.w3.org/TR/CSS21/">https://www.w3.org/TR/CSS21/</a>
<dt id="biblio-css3-mediaqueries">[CSS3-MEDIAQUERIES]
<dd>Florian Rivoal; et al. <a href="https://www.w3.org/TR/css3-mediaqueries/"><cite>Media Queries</cite></a>. 19 June 2012. REC. URL: <a href="https://www.w3.org/TR/css3-mediaqueries/">https://www.w3.org/TR/css3-mediaqueries/</a>
<dt id="biblio-css3-namespace">[CSS3-NAMESPACE]
<dd>Elika Etemad. <a href="https://www.w3.org/TR/css-namespaces-3/"><cite>CSS Namespaces Module Level 3</cite></a>. 20 March 2014. REC. URL: <a href="https://www.w3.org/TR/css-namespaces-3/">https://www.w3.org/TR/css-namespaces-3/</a>
<dt id="biblio-resize-observer-1">[RESIZE-OBSERVER-1]
<dd>Aleks Totic; Greg Whitworth. <a href="https://www.w3.org/TR/resize-observer-1/"><cite>Resize Observer</cite></a>. 11 February 2020. WD. URL: <a href="https://www.w3.org/TR/resize-observer-1/">https://www.w3.org/TR/resize-observer-1/</a>
<dt id="biblio-rfc2119">[RFC2119]
<dd>S. Bradner. <a href="https://datatracker.ietf.org/doc/html/rfc2119"><cite>Key words for use in RFCs to Indicate Requirement Levels</cite></a>. March 1997. Best Current Practice. URL: <a href="https://datatracker.ietf.org/doc/html/rfc2119">https://datatracker.ietf.org/doc/html/rfc2119</a>
<dt id="biblio-selectors-3">[SELECTORS-3]
<dd>Tantek Çelik; et al. <a href="https://www.w3.org/TR/selectors-3/"><cite>Selectors Level 3</cite></a>. 6 November 2018. REC. URL: <a href="https://www.w3.org/TR/selectors-3/">https://www.w3.org/TR/selectors-3/</a>
<dt id="biblio-selectors-4">[SELECTORS-4]
<dd>Elika Etemad; Tab Atkins Jr.. <a href="https://www.w3.org/TR/selectors-4/"><cite>Selectors Level 4</cite></a>. 21 November 2018. WD. URL: <a href="https://www.w3.org/TR/selectors-4/">https://www.w3.org/TR/selectors-4/</a>
<dt id="biblio-web-animations-1">[WEB-ANIMATIONS-1]
<dd>Brian Birtles; et al. <a href="https://www.w3.org/TR/web-animations-1/"><cite>Web Animations</cite></a>. 18 May 2021. WD. URL: <a href="https://www.w3.org/TR/web-animations-1/">https://www.w3.org/TR/web-animations-1/</a>
</dl>
<h3 class="no-num no-ref heading settled" id="informative"><span class="content">Informative References</span><a class="self-link" href="#informative"></a></h3>
<dl>
<dt id="biblio-css-align-3">[CSS-ALIGN-3]
<dd>Elika Etemad; Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-align-3/"><cite>CSS Box Alignment Module Level 3</cite></a>. 24 December 2021. WD. URL: <a href="https://www.w3.org/TR/css-align-3/">https://www.w3.org/TR/css-align-3/</a>
<dt id="biblio-css-animations-1">[CSS-ANIMATIONS-1]
<dd>Dean Jackson; et al. <a href="https://www.w3.org/TR/css-animations-1/"><cite>CSS Animations Level 1</cite></a>. 11 October 2018. WD. URL: <a href="https://www.w3.org/TR/css-animations-1/">https://www.w3.org/TR/css-animations-1/</a>
<dt id="biblio-css-break-3">[CSS-BREAK-3]
<dd>Rossen Atanassov; Elika Etemad. <a href="https://www.w3.org/TR/css-break-3/"><cite>CSS Fragmentation Module Level 3</cite></a>. 4 December 2018. CR. URL: <a href="https://www.w3.org/TR/css-break-3/">https://www.w3.org/TR/css-break-3/</a>
<dt id="biblio-css-cascade-3">[CSS-CASCADE-3]
<dd>Elika Etemad; Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-cascade-3/"><cite>CSS Cascading and Inheritance Level 3</cite></a>. 11 February 2021. REC. URL: <a href="https://www.w3.org/TR/css-cascade-3/">https://www.w3.org/TR/css-cascade-3/</a>
<dt id="biblio-css-font-loading-3">[CSS-FONT-LOADING-3]
<dd>Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-font-loading-3/"><cite>CSS Font Loading Module Level 3</cite></a>. 22 May 2014. WD. URL: <a href="https://www.w3.org/TR/css-font-loading-3/">https://www.w3.org/TR/css-font-loading-3/</a>
<dt id="biblio-css-masking-1">[CSS-MASKING-1]
<dd>Dirk Schulze; Brian Birtles; Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-masking-1/"><cite>CSS Masking Module Level 1</cite></a>. 5 August 2021. CR. URL: <a href="https://www.w3.org/TR/css-masking-1/">https://www.w3.org/TR/css-masking-1/</a>
<dt id="biblio-css-scroll-snap-1">[CSS-SCROLL-SNAP-1]
<dd>Matt Rakow; et al. <a href="https://www.w3.org/TR/css-scroll-snap-1/"><cite>CSS Scroll Snap Module Level 1</cite></a>. 11 March 2021. CR. URL: <a href="https://www.w3.org/TR/css-scroll-snap-1/">https://www.w3.org/TR/css-scroll-snap-1/</a>
<dt id="biblio-css-scrollbars-1">[CSS-SCROLLBARS-1]
<dd>Tantek Çelik; Rossen Atanassov; Florian Rivoal. <a href="https://www.w3.org/TR/css-scrollbars-1/"><cite>CSS Scrollbars Styling Module Level 1</cite></a>. 9 December 2021. CR. URL: <a href="https://www.w3.org/TR/css-scrollbars-1/">https://www.w3.org/TR/css-scrollbars-1/</a>
<dt id="biblio-css-shapes-1">[CSS-SHAPES-1]
<dd>Vincent Hardy; Rossen Atanassov; Alan Stearns. <a href="https://www.w3.org/TR/css-shapes-1/"><cite>CSS Shapes Module Level 1</cite></a>. 20 March 2014. CR. URL: <a href="https://www.w3.org/TR/css-shapes-1/">https://www.w3.org/TR/css-shapes-1/</a>
<dt id="biblio-css-speech-1">[CSS-SPEECH-1]
<dd>Daniel Weck. <a href="https://www.w3.org/TR/css-speech-1/"><cite>CSS Speech Module</cite></a>. 10 March 2020. CR. URL: <a href="https://www.w3.org/TR/css-speech-1/">https://www.w3.org/TR/css-speech-1/</a>
<dt id="biblio-css-text-3">[CSS-TEXT-3]
<dd>Elika Etemad; Koji Ishii; Florian Rivoal. <a href="https://www.w3.org/TR/css-text-3/"><cite>CSS Text Module Level 3</cite></a>. 22 April 2021. CR. URL: <a href="https://www.w3.org/TR/css-text-3/">https://www.w3.org/TR/css-text-3/</a>
<dt id="biblio-css-text-decor-3">[CSS-TEXT-DECOR-3]
<dd>Elika Etemad; Koji Ishii. <a href="https://www.w3.org/TR/css-text-decor-3/"><cite>CSS Text Decoration Module Level 3</cite></a>. 13 August 2019. CR. URL: <a href="https://www.w3.org/TR/css-text-decor-3/">https://www.w3.org/TR/css-text-decor-3/</a>
<dt id="biblio-css-transitions-1">[CSS-TRANSITIONS-1]
<dd>David Baron; et al. <a href="https://www.w3.org/TR/css-transitions-1/"><cite>CSS Transitions</cite></a>. 11 October 2018. WD. URL: <a href="https://www.w3.org/TR/css-transitions-1/">https://www.w3.org/TR/css-transitions-1/</a>
<dt id="biblio-css-writing-modes-4">[CSS-WRITING-MODES-4]
<dd>Elika Etemad; Koji Ishii. <a href="https://www.w3.org/TR/css-writing-modes-4/"><cite>CSS Writing Modes Level 4</cite></a>. 30 July 2019. CR. URL: <a href="https://www.w3.org/TR/css-writing-modes-4/">https://www.w3.org/TR/css-writing-modes-4/</a>
<dt id="biblio-filter-effects-1">[FILTER-EFFECTS-1]
<dd>Dirk Schulze; Dean Jackson. <a href="https://www.w3.org/TR/filter-effects-1/"><cite>Filter Effects Module Level 1</cite></a>. 18 December 2018. WD. URL: <a href="https://www.w3.org/TR/filter-effects-1/">https://www.w3.org/TR/filter-effects-1/</a>
<dt id="biblio-mediaqueries-4">[MEDIAQUERIES-4]
<dd>Florian Rivoal; Tab Atkins Jr.. <a href="https://www.w3.org/TR/mediaqueries-4/"><cite>Media Queries Level 4</cite></a>. 25 December 2021. CR. URL: <a href="https://www.w3.org/TR/mediaqueries-4/">https://www.w3.org/TR/mediaqueries-4/</a>
</dl>
<aside class="dfn-panel" data-for="editors-draft">
<b><a href="#editors-draft">#editors-draft</a></b><b>Referenced in:</b>
<ul>
<li><a href="#ref-for-editors-draft">1.1.
Background: The W3C Process and CSS</a> <a href="#ref-for-editors-draft①">(2)</a>
</ul>
</aside>
<aside class="dfn-panel" data-for="css-level-1">
<b><a href="#css-level-1">#css-level-1</a></b><b>Referenced in:</b>
<ul>
<li><a href="#ref-for-css-level-1">2.4.
CSS Levels</a>
</ul>
</aside>
<aside class="dfn-panel" data-for="css-level-2">
<b><a href="#css-level-2">#css-level-2</a></b><b>Referenced in:</b>
<ul>
<li><a href="#ref-for-css-level-2">2.4.
CSS Levels</a> <a href="#ref-for-css-level-2①">(2)</a> <a href="#ref-for-css-level-2②">(3)</a>
</ul>
</aside>
<aside class="dfn-panel" data-for="css-level-3">
<b><a href="#css-level-3">#css-level-3</a></b><b>Referenced in:</b>
<ul>
<li><a href="#ref-for-css-level-3">2.4.
CSS Levels</a>
</ul>
</aside>
<aside class="dfn-panel" data-for="unstable">
<b><a href="#unstable">#unstable</a></b><b>Referenced in:</b>
<ul>
<li><a href="#ref-for-unstable">3.2. Implementations of Unstable and Proprietary Features</a>
<li><a href="#ref-for-unstable①">3.2.1.
Experimentation and Unstable Features</a> <a href="#ref-for-unstable②">(2)</a>
<li><a href="#ref-for-unstable③">3.2.3.
Market Pressure and De Facto Standards</a> <a href="#ref-for-unstable④">(2)</a>
<li><a href="#ref-for-unstable⑤">3.2.3.1.
Vendor-prefixing Unstable Features</a> <a href="#ref-for-unstable⑥">(2)</a>
</ul>
</aside>
<aside class="dfn-panel" data-for="vendor-prefix">
<b><a href="#vendor-prefix">#vendor-prefix</a></b><b>Referenced in:</b>
<ul>
<li><a href="#ref-for-vendor-prefix">3.2.2.
Proprietary and Non-standardized Features</a>
<li><a href="#ref-for-vendor-prefix①">3.2.3.
Market Pressure and De Facto Standards</a>
<li><a href="#ref-for-vendor-prefix②">3.2.3.1.
Vendor-prefixing Unstable Features</a> <a href="#ref-for-vendor-prefix③">(2)</a> <a href="#ref-for-vendor-prefix④">(3)</a>
<li><a href="#ref-for-vendor-prefix⑤">3.3. Implementations of CR-level Features</a>
</ul>
</aside>
<aside class="dfn-panel" data-for="proprietary-extension">
<b><a href="#proprietary-extension">#proprietary-extension</a></b><b>Referenced in:</b>
<ul>
<li><a href="#ref-for-proprietary-extension">3.2. Implementations of Unstable and Proprietary Features</a>
<li><a href="#ref-for-proprietary-extension①">3.2.2.
Proprietary and Non-standardized Features</a> <a href="#ref-for-proprietary-extension②">(2)</a> <a href="#ref-for-proprietary-extension③">(3)</a>
</ul>
</aside>
<aside class="dfn-panel" data-for="rough-interoperability">
<b><a href="#rough-interoperability">#rough-interoperability</a></b><b>Referenced in:</b>
<ul>
<li><a href="#ref-for-rough-interoperability">2.3.
Modules with Rough Interoperability</a>
<li><a href="#ref-for-rough-interoperability①">3.2.3.
Market Pressure and De Facto Standards</a>
</ul>
</aside>
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