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<!doctype html>
<html lang="en">
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<title>CSS Basic User Interface Module Level 3 (CSS3 UI)</title>
<link href="../default.css" rel="stylesheet" type="text/css">
<link href="../csslogo.ico" rel="shortcut icon" type="image/x-icon">
<style>
body {
background: url("https://www.w3.org/StyleSheets/TR/logo-ED") top left no-repeat white;
background-attachment: fixed;
color: black;
font-family: sans-serif;
margin: 0 auto;
max-width: 50em;
padding: 2em 1em 2em 70px;
}
:link { color: #00C; background: transparent }
:visited { color: #609; background: transparent }
a[href]:active { color: #C00; background: transparent }
a[href]:hover { background: #ffa }
a[href] img { border-style: none }
h1, h2, h3, h4, h5, h6 { text-align: left }
h1, h2, h3 { color: #005A9C; }
h1 { font: 170% sans-serif }
h2 { font: 140% sans-serif }
h3 { font: 120% sans-serif }
h4 { font: bold 100% sans-serif }
h5 { font: italic 100% sans-serif }
h6 { font: small-caps 100% sans-serif }
.hide { display: none }
div.head { margin-bottom: 1em }
div.head h1 { margin-top: 2em; clear: both }
div.head table { margin-left: 2em; margin-top: 2em }
p.copyright { font-size: small }
p.copyright small { font-size: small }
pre { margin-left: 2em }
dt { font-weight: bold }
ul.toc, ol.toc {
list-style: none;
}
</style>
<meta content="Bikeshed 1.0.0" name="generator">
<script defer="" src="//test.csswg.org/harness/annotate.js#css-ui-3_dev/css-ui-3" type="text/javascript"></script>
<style>#awesome-table td {padding:5px}</style>
<script>self = (typeof window !== 'undefined')
? window // if in browser
: (
(typeof WorkerGlobalScope !== 'undefined' && self instanceof WorkerGlobalScope)
? self // if in worker
: {} // if in node js
);
/**
* Prism: Lightweight, robust, elegant syntax highlighting
* MIT license http://www.opensource.org/licenses/mit-license.php/
* @author Lea Verou http://lea.verou.me
*/
var Prism = (function(){
// Private helper vars
var lang = /\blang(?:uage)?-(?!\*)(\w+)\b/i;
var _ = self.Prism = {
util: {
encode: function (tokens) {
if (tokens instanceof Token) {
return new Token(tokens.type, _.util.encode(tokens.content), tokens.alias);
} else if (_.util.type(tokens) === 'Array') {
return tokens.map(_.util.encode);
} else {
return tokens.replace(/&/g, '&').replace(/</g, '<').replace(/\u00a0/g, ' ');
}
},
type: function (o) {
return Object.prototype.toString.call(o).match(/\[object (\w+)\]/)[1];
},
// Deep clone a language definition (e.g. to extend it)
clone: function (o) {
var type = _.util.type(o);
switch (type) {
case 'Object':
var clone = {};
for (var key in o) {
if (o.hasOwnProperty(key)) {
clone[key] = _.util.clone(o[key]);
}
}
return clone;
case 'Array':
return o.slice();
}
return o;
}
},
languages: {
extend: function (id, redef) {
var lang = _.util.clone(_.languages[id]);
for (var key in redef) {
lang[key] = redef[key];
}
return lang;
},
// Insert a token before another token in a language literal
insertBefore: function (inside, before, insert, root) {
root = root || _.languages;
var grammar = root[inside];
var ret = {};
for (var token in grammar) {
if (grammar.hasOwnProperty(token)) {
if (token == before) {
for (var newToken in insert) {
if (insert.hasOwnProperty(newToken)) {
ret[newToken] = insert[newToken];
}
}
}
ret[token] = grammar[token];
}
}
return root[inside] = ret;
},
// Traverse a language definition with Depth First Search
DFS: function(o, callback, type) {
for (var i in o) {
if (o.hasOwnProperty(i)) {
callback.call(o, i, o[i], type || i);
if (_.util.type(o[i]) === 'Object') {
_.languages.DFS(o[i], callback);
} else if (_.util.type(o[i]) === 'Array') {
_.languages.DFS(o[i], callback, i);
}
}
}
}
},
highlightAll: function(async, callback) {
var elements = document.querySelectorAll('code[class*="language-"], [class*="language-"] code, code[class*="lang-"], [class*="lang-"] code');
for (var i=0, element; element = elements[i++];) {
if (element.classList.contains("idl")) {
// Bikeshed handles IDL blocks already.
continue;
}
_.highlightElement(element, async === true, callback);
}
var elements = document.querySelectorAll('pre[class*="language-"], [class*="language-"] pre, pre[class*="lang-"], [class*="lang-"] pre');
for (var i=0, element; element = elements[i++];) {
if (element.firstElementChild && element.firstElementChild.tagName.toLowerCase() == "code") {
// Already handled by the previous loop
continue;
}
if (element.classList.contains("idl")) {
// Bikeshed handles IDL blocks already.
continue;
}
_.highlightElement(element, async === true, callback);
}
},
highlightElement: function(element, async, callback) {
// Find language
var language, grammar, parent = element;
while (parent && !lang.test(parent.className)) {
parent = parent.parentNode;
}
if (parent) {
language = (parent.className.match(lang) || [,''])[1];
grammar = _.languages[language];
}
if (!grammar) {
return;
}
// Set language on the element, if not present
6D50
element.className = element.className.replace(lang, '').replace(/\s+/g, ' ') + ' language-' + language;
// Set language on the parent, for styling
parent = element.parentNode;
if (/pre/i.test(parent.nodeName)) {
parent.className = parent.className.replace(lang, '').replace(/\s+/g, ' ') + ' language-' + language;
}
var code = element.textContent;
if(!code) {
return;
}
var env = {
element: element,
language: language,
grammar: grammar,
code: code
};
_.hooks.run('before-highlight', env);
if (async && self.Worker) {
var worker = new Worker(_.filename);
worker.onmessage = function(evt) {
env.highlightedCode = Token.stringify(JSON.parse(evt.data), language);
_.hooks.run('before-insert', env);
env.element.innerHTML = env.highlightedCode;
callback && callback.call(env.element);
_.hooks.run('after-highlight', env);
};
worker.postMessage(JSON.stringify({
language: env.language,
code: env.code
}));
}
else {
env.highlightedCode = _.highlight(env.code, env.grammar, env.language)
_.hooks.run('before-insert', env);
env.element.innerHTML = env.highlightedCode;
callback && callback.call(element);
_.hooks.run('after-highlight', env);
}
},
highlight: function (text, grammar, language) {
var tokens = _.tokenize(text, grammar);
return Token.stringify(_.util.encode(tokens), language);
},
tokenize: function(text, grammar, language) {
var Token = _.Token;
var strarr = [text];
var rest = grammar.rest;
if (rest) {
for (var token in rest) {
grammar[token] = rest[token];
}
delete grammar.rest;
}
tokenloop: for (var token in grammar) {
if(!grammar.hasOwnProperty(token) || !grammar[token]) {
continue;
}
var patterns = grammar[token];
patterns = (_.util.type(patterns) === "Array") ? patterns : [patterns];
for (var j = 0; j < patterns.length; ++j) {
var pattern = patterns[j],
inside = pattern.inside,
lookbehind = !!pattern.lookbehind,
lookbehindLength = 0,
alias = pattern.alias;
pattern = pattern.pattern || pattern;
for (var i=0; i<strarr.length; i++) { // Don’t cache length as it changes during the loop
var str = strarr[i];
if (strarr.length > text.length) {
// Something went terribly wrong, ABORT, ABORT!
break tokenloop;
}
if (str instanceof Token) {
continue;
}
pattern.lastIndex = 0;
var match = pattern.exec(str);
if (match) {
if(lookbehind) {
lookbehindLength = match[1].length;
}
var from = match.index - 1 + lookbehindLength,
match = match[0].slice(lookbehindLength),
len = match.length,
to = from + len,
before = str.slice(0, from + 1),
after = str.slice(to + 1);
var args = [i, 1];
if (before) {
args.push(before);
}
var wrapped = new Token(token, inside? _.tokenize(match, inside) : match, alias);
args.push(wrapped);
if (after) {
args.push(after);
}
Array.prototype.splice.apply(strarr, args);
}
}
}
}
return strarr;
},
hooks: {
all: {},
add: function (name, callback) {
var hooks = _.hooks.all;
hooks[name] = hooks[name] || [];
hooks[name].push(callback);
},
run: function (name, env) {
var callbacks = _.hooks.all[name];
if (!callbacks || !callbacks.length) {
return;
}
for (var i=0, callback; callback = callbacks[i++];) {
callback(env);
}
}
}
};
var Token = _.Token = function(type, content, alias) {
this.type = type;
this.content = content;
this.alias = alias;
};
Token.stringify = function(o, language, parent) {
if (typeof o == 'string') {
return o;
}
if (Object.prototype.toString.call(o) == '[object Array]') {
return o.map(function(element) {
return Token.stringify(element, language, o);
}).join('');
}
var env = {
type: o.type,
content: Token.stringify(o.content, language, parent),
tag: 'span',
classes: ['token', o.type],
attributes: {},
language: language,
parent: parent
};
if (env.type == 'comment') {
env.attributes['spellcheck'] = 'true';
}
if (o.alias) {
var aliases = _.util.type(o.alias) === 'Array' ? o.alias : [o.alias];
Array.prototype.push.apply(env.classes, aliases);
}
_.hooks.run('wrap', env);
var attributes = '';
for (var name in env.attributes) {
attributes += name + '="' + (env.attributes[name] || '') + '"';
}
return '<' + env.tag + ' class="' + env.classes.join(' ') + '" ' + attributes + '>' + env.content + '</' + env.tag + '>';
};
if (!self.document) {
if (!self.addEventListener) {
// in Node.js
return self.Prism;
}
// In worker
self.addEventListener('message', function(evt) {
var message = JSON.parse(evt.data),
lang = message.language,
code = message.code;
self.postMessage(JSON.stringify(_.util.encode(_.tokenize(code, _.languages[lang]))));
self.close();
}, false);
return self.Prism;
}
// Get current script and highlight
var script = document.getElementsByTagName('script');
script = script[script.length - 1];
if (script) {
_.filename = script.src;
if (document.addEventListener && !script.hasAttribute('data-manual')) {
document.addEventListener('DOMContentLoaded', _.highlightAll);
}
}
return self.Prism;
})();
if (typeof module !== 'undefined' && module.exports) {
module.exports = Prism;
}
;
Prism.languages.markup = {
'comment': /<!--[\w\W]*?-->/g,
'prolog': /<\?.+?\?>/,
'doctype': /<!DOCTYPE.+?>/,
'cdata': /<!\[CDATA\[[\w\W]*?]]>/i,
'tag': {
pattern: /<\/?[\w:-]+\s*(?:\s+[\w:-]+(?:=(?:("|')(\\?[\w\W])*?\1|[^\s'">=]+))?\s*)*\/?>/gi,
inside: {
'tag': {
pattern: /^<\/?[\w:-]+/i,
inside: {
'punctuation': /^<\/?/,
'namespace': /^[\w-]+?:/
}
},
'attr-value': {
pattern: /=(?:('|")[\w\W]*?(\1)|[^\s>]+)/gi,
inside: {
'punctuation': /=|>|"/g
}
},
'punctuation': /\/?>/g,
'attr-name': {
pattern: /[\w:-]+/g,
inside: {
'namespace': /^[\w-]+?:/
}
}
}
},
'entity': /\&#?[\da-z]{1,8};/gi
};
// Plugin to make entity title show the real entity, idea by Roman Komarov
Prism.hooks.add('wrap', function(env) {
if (env.type === 'entity') {
env.attributes['title'] = env.content.replace(/&/, '&');
}
});
;
Prism.languages.css = {
'comment': /\/\*[\w\W]*?\*\//g,
'atrule': {
pattern: /@[\w-]+?.*?(;|(?=\s*{))/gi,
inside: {
'punctuation': /[;:]/g
}
},
'url': /url\((["']?).*?\1\)/gi,
'selector': /[^\{\}\s][^\{\};]*(?=\s*\{)/g,
'property': /(\b|\B)[\w-]+(?=\s*:)/ig,
'string': /("|')(\\?.)*?\1/g,
'important': /\B!important\b/gi,
'punctuation': /[\{\};:]/g,
'function': /[-a-z0-9]+(?=\()/ig
};
if (Prism.languages.markup) {
Prism.languages.insertBefore('markup', 'tag', {
'style': {
pattern: /<style[\w\W]*?>[\w\W]*?<\/style>/ig,
inside: {
'tag': {
pattern: /<style[\w\W]*?>|<\/style>/ig,
inside: Prism.languages.markup.tag.inside
},
rest: Prism.languages.css
}
}
});
};
Prism.languages.css.selector = {
pattern: /[^\{\}\s][^\{\}]*(?=\s*\{)/g,
inside: {
'pseudo-element': /:(?:after|before|first-letter|first-line|selection)|::[-\w]+/g,
'pseudo-class': /:[-\w]+(?:\(.*\))?/g,
'class': /\.[-:\.\w]+/g,
'id': /#[-:\.\w]+/g
}
};
Prism.languages.insertBefore('css', 'ignore', {
'hexcode': /#[\da-f]{3,6}/gi,
'entity': /\\[\da-f]{1,8}/gi,
'number': /[\d%\.]+/g
});;
</script>
<style>/* http://prismjs.com/download.html?themes=prism&languages=clike */
/**
* prism.js default theme for JavaScript, CSS and HTML
* Based on dabblet (http://dabblet.com)
* @author Lea Verou
*/
code[class*="language-"],
pre[class*="language-"] {
color: black;
text-shadow: 0 1px white;
font-family: Consolas, Monaco, 'Andale Mono', monospace;
direction: ltr;
text-align: left;
white-space: pre;
word-spacing: normal;
word-break: normal;
line-height: 1.5;
-moz-tab-size: 4;
-o-tab-size: 4;
tab-size: 4;
-webkit-hyphens: none;
-moz-hyphens: none;
-ms-hyphens: none;
hyphens: none;
}
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</head>
<body class="h-entry">
<div class="head">
<p data-fill-with="logo"><a class="logo" href="http://www.w3.org/">
<img alt="W3C" height="48" src="https://www.w3.org/Icons/w3c_home" width="72">
</a>
</p>
<h1 class="p-name no-ref" id="title">CSS Basic User Interface Module Level 3 (CSS3 UI)</h1>
<h2 class="no-num no-toc no-ref heading settled" id="subtitle"><span class="content">Editor’s Draft,
<time class="dt-updated" datetime="2015-04-09">9 April 2015</time></span></h2>
<div data-fill-with="spec-metadata">
<dl>
<dt>This version:
<dd><a class="u-url" href="http://dev.w3.org/csswg/css-ui/">http://dev.w3.org/csswg/css-ui/</a>
<dt>Latest version:
<dd><a href="http://www.w3.org/TR/css3-ui/">http://www.w3.org/TR/css3-ui/</a>
<dt>Previous Versions:
<dd><a href="http://www.w3.org/TR/2012/WD-css3-ui-20120117/" rel="previous">http://www.w3.org/TR/2012/WD-css3-ui-20120117/</a>
<dt>Feedback:
<dd><span><a href="mailto:www-style@w3.org?subject=%5Bcss-ui%5D%20feedback">www-style@w3.org</a> with subject line “<kbd>[css-ui] <var>… message topic …</var></kbd>” (<a href="http://lists.w3.org/Archives/Public/www-style/" rel="discussion">archives</a>)</span>
<dt>Test Suite:
<dd><a href="http://test.csswg.org/suites/css-ui-3_dev/nightly-unstable/">http://test.csswg.org/suites/css-ui-3_dev/nightly-unstable/</a>
<dt>Issue Tracking:
<dd><a href="#issues-index">Inline In Spec</a>
<dd><span>http://wiki.csswg.org/spec/css3-ui</span>
<dt class="editor">Editors:
<dd class="editor p-author h-card vcard"><a class="p-name fn u-url url" href="http://tantek.com">Tantek Çelik</a> (<a class="p-org org" href="http://www.mozilla.org">Mozilla</a>) <a class="u-email email" href="mailto:tantek@cs.stanford.edu">tantek@cs.stanford.edu</a>
<dd class="editor p-author h-card vcard"><span class="p-name fn"></span>
</dl>
</div>
<div data-fill-with="warning"></div>
<p class="copyright" data-fill-with="copyright"><a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 2015 <a href="http://www.w3.org/">
1DDA
;<abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup> (<a href="http://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>, <a href="http://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>, <a href="http://www.keio.ac.jp/">Keio</a>, <a href="http://ev.buaa.edu.cn/">Beihang</a>). W3C <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a> rules apply.
</p>
<hr title="Separator for header">
</div>
<h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>
<div class="p-summary" data-fill-with="abstract">
<p>This specification describes user interface related selectors,
properties and values that are proposed for CSS level 3
to style HTML and XML (including XHTML).
It includes and extends user interface related features from the selectors,
properties and values of CSS level 2 revision 1 and Selectors specifications.
It uses various selectors,
properties and values to style basic user interface elements in a document.</p>
<a href="http://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, in speech, etc.</div>
<h2 class="no-num no-toc no-ref heading settled" id="status"><span class="content">Status of this document</span></h2>
<div data-fill-with="status">
<p>
This is a public copy of the editors’ draft.
It is provided for discussion only and may change at any moment.
Its publication here does not imply endorsement of its contents by W3C.
Don’t cite this document other than as work in progress.
</p>
<p>
The (<a href="http://lists.w3.org/Archives/Public/www-style/">archived</a>) public mailing list
<a href="mailto:www-style@w3.org?Subject=%5Bcss-ui%5D%20PUT%20SUBJECT%20HERE">www-style@w3.org</a>
(see <a href="http://www.w3.org/Mail/Request">instructions</a>)
is preferred for discussion of this specification.
When sending e-mail,
please put the text “css-ui” in the subject,
preferably like this:
“[css-ui] <em>…summary of comment…</em>”
</p>
<p>
This document was produced by the <a href="http://www.w3.org/Style/CSS/members">CSS Working Group</a>
(part of the <a href="http://www.w3.org/Style/">Style Activity</a>).
</p>
<p>
This document was produced by a group operating under
the <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 W3C Patent Policy</a>.
W3C maintains a <a href="http://www.w3.org/2004/01/pp-impl/32061/status" rel="disclosure">public list of any patent disclosures</a>
made in connection with the deliverables of the group;
that page also includes instructions for disclosing a patent.
An individual who has actual knowledge of a patent which the individual believes contains <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential Claim(s)</a>
must disclose the information in accordance with <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section 6 of the W3C Patent Policy</a>.
</p>
<p>
This document is governed by the <a href="http://www.w3.org/2014/Process-20140801/" id="w3c_process_revision">1 August 2014 W3C Process Document</a>.
</p>
<p>
</p></div>
<div data-fill-with="at-risk">
<p>The following features are at-risk, and may be dropped during the CR period:
</p>
<ul>
<li><a class="property" data-link-type="propdesc" href="#propdef-box-sizing">box-sizing</a> property value: padding-box
<li><a class="property" data-link-type="propdesc" href="#propdef-caret-color">caret-color</a> property
<li><a class="property" data-link-type="propdesc" href="#propdef-text-overflow">text-overflow</a> property value: <a class="production css" data-link-type="type" href="http://dev.w3.org/csswg/css-values-3/#string-value"><string></a>
<li><a class="property" data-link-type="propdesc" href="#propdef-text-overflow">text-overflow</a> property 2-value syntax and definition
<li><a class="property" data-link-type="propdesc" href="#propdef-outline-offset">outline-offset</a> property negative values
</ul></div>
<h2 class="no-num no-toc no-ref heading settled" id="contents"><span class="content">Table of Contents</span></h2>
<div data-fill-with="table-of-contents" role="navigation">
<ul class="toc" role="directory">
<li><a href="#intro"><span class="secno">1</span> <span class="content">Introduction</span></a>
<ul class="toc">
<li><a href="#purpose"><span class="secno">1.1</span> <span class="content">Purpose</span></a>
</ul>
<li><a href="#interaction"><span class="secno">2</span> <span class="content">Module Interactions</span></a>
<li><a href="#box-model"><span class="secno">3</span> <span class="content">Box Model addition</span></a>
<ul class="toc">
<li><a href="#box-sizing"><span class="secno">3.1</span> <span class="content"><span class="property">box-sizing</span> property</span></a>
</ul>
<li><a href="#outline-props"><span class="secno">4</span> <span class="content">Outline properties</span></a>
<ul class="toc">
<li><a href="#outline"><span class="secno">4.1</span> <span class="content"><span class="property">outline</span> property</span></a>
<li><a href="#outline-width"><span class="secno">4.2</span> <span class="content"><span class="property">outline-width</span> property</span></a>
<li><a href="#outline-style"><span class="secno">4.3</span> <span class="content"><span class="property">outline-style</span> property</span></a>
<li><a href="#outline-color"><span class="secno">4.4</span> <span class="content"><span class="property">outline-color</span> property</span></a>
<li><a href="#outline-offset"><span class="secno">4.5</span> <span class="content"><span class="property">outline-offset</span> property</span></a>
</ul>
<li><a href="#resizing-and-overflow"><span class="secno">5</span> <span class="content">Resizing & Overflow</span></a>
<ul class="toc">
<li><a href="#resize"><span class="secno">5.1</span> <span class="content"><span class="property">resize</span> property</span></a>
<li><a href="#text-overflow"><span class="secno">5.2</span> <span class="content">
Overflow Ellipsis: the <span class="property">text-overflow</span> property</span></a>
</ul>
<li><a href="#pointing-keyboard"><span class="secno">6</span> <span class="content">Pointing Devices and Keyboards</span></a>
<ul class="toc">
<li><a href="#pointer-interaction"><span class="secno">6.1</span> <span class="content">Pointer interaction</span></a>
<ul class="toc">
<li><a href="#cursor"><span class="secno">6.1.1</span> <span class="content"><span class="property">cursor</span> property</span></a>
<ul class="toc">
<li><a href="#canvas_cursor"><span class="secno">6.1.1.1</span> <span class="content">Cursor of the canvas</span></a>
</ul>
</ul>
<li><a href="#insertion-caret"><span class="secno">6.2</span> <span class="content">Insertion caret</span></a>
<ul class="toc">
<li><a href="#caret-color"><span class="secno">6.2.1</span> <span class="content">Coloring the insertion caret: caret-color</span></a>
</ul>
<li><a href="#keyboard"><span class="secno">6.3</span> <span class="content">Keyboard control</span></a>
<ul class="toc">
<li><a href="#nav-dir"><span class="secno">6.3.1</span> <span class="content">Directional focus navigation: the <span class="property">nav-up</span>, <span class="property">nav-right</span>, <span class="property">nav-down</span>, <span class="property">nav-left</span> properties</span></a>
<ul class="toc">
<li><a href="#example-positioned-buttons"><span class="secno">6.3.1.1</span> <span class="content">Example: positioned buttons</span></a>
<li><a href="#example-moving-focus-to-inside-a-frame"><span class="secno">6.3.1.2</span> <span class="content">Example: moving focus to inside a frame</span></a>
</ul>
<li><a href="#input-method-editor"><span class="secno">6.3.2</span> <span class="content">Obsolete: the ime-mode property</span></a>
</ul>
</ul>
<li><a href="#acknowledgments"><span class="secno"></span> <span class="content">Appendix A. Acknowledgments</span></a>
<li><a href="#changes"><span class="secno"></span> <span class="content">Appendix B. Changes</span></a>
<ul class="toc">
<li><a href="#changes-list"><span class="secno"></span> <span class="content">List of substantial changes</span></a>
</ul>
<li><a href="#default-style-sheet"><span class="secno"></span> <span class="content">Appendix C. Default style sheet additions for HTML</span></a>
<li><a href="#test-suite"><span class="secno"></span> <span class="content">Appendix D: Test Suite</span></a>
<li><a href="#conformance"><span class="secno"></span> <span class="content">
Conformance</span></a>
<ul class="toc">
<li><a href="#conventions"><span class="secno"></span> <span class="content">
Document conventions</span></a>
<li><a href="#conformance-classes"><span class="secno"></span> <span class="content">
Conformance classes</span></a>
<li><a href="#partial"><span class="secno"></span> <span class="content">
Partial implementations</span></a>
<li><a href="#experimental"><span class="secno"></span> <span class="content">
Experimental implementations</span></a>
<li><a href="#testing"><span class="secno"></span> <span class="content">
Non-experimental implementations</span></a>
</ul>
<li><a href="#index"><span class="secno"></span> <span class="content">Index</span></a>
<ul class="toc">
<li><a href="#index-defined-here"><span class="secno"></span> <span class="content">Terms defined by this specification</span></a>
<li><a href="#index-defined-elsewhere"><span class="secno"></span> <span class="content">Terms defined by reference</span></a>
</ul>
<li><a href="#references"><span class="secno"></span> <span class="content">References</span></a>
<ul class="toc">
<li><a href="#normative"><span class="secno"></span> <span class="content">Normative References</span></a>
<li><a href="#informative"><span class="secno"></span> <span class="content">Informative References</span></a>
</ul>
<li><a href="#property-index"><span class="secno"></span> <span class="content">Property Index</span></a>
<li><a href="#issues-index"><span class="secno"></span> <span class="content">Issues Index</span></a>
</ul></div>
<main>
<p></p>
<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>This module describes CSS properties which enable authors
to style user interface related properties and values.</p>
<p><a href="http://www.w3.org/TR/REC-CSS1#anchor-pseudo-classes">Section 2.1 of CSS1</a> <a data-link-type="biblio" href="#biblio-css1">[CSS1]</a>
and <a href="http://www.w3.org/TR/CSS2/ui.html">Chapter 18 of CSS2</a> <a data-link-type="biblio" href="#biblio-css2">[CSS2]</a>
introduced several user interface related properties and values.
<a href="http://www.w3.org/TR/2000/WD-css3-userint-20000216">User Interface for CSS3 (16 February 2000)</a> introduced several new user interface related features.</p>
<p>This Working Draft incorporates, extends, and supersedes them.</p>
<h3 class="heading settled" data-level="1.1" id="purpose"><span class="secno">1.1. </span><span class="content">Purpose</span><a class="self-link" href="#purpose"></a></h3>
<p>The purpose of this specification is to achieve the following objectives:</p>
<ul>
<li>Extend the user interface features in CSS2.1.
<li>Provide additional CSS mechanisms to augment or replace other
dynamic presentation related features in HTML.
<li>Introduce directional navigation properties to assist in the construction of
user interfaces which make use of a directional navigation model.
</ul>
<h2 class="heading settled" data-level="2" id="interaction"><span class="secno">2. </span><span class="content">Module Interactions</span><a class="self-link" href="#interaction"></a></h2>
<p>This document defines new features not present in earlier specifications.
In addition, it replaces and supersedes the following:</p>
<ul>
<li><a href="http://www.w3.org/TR/CSS21/ui.html#cursor-props">Section 18.1</a>
and
<a href="http://www.w3.org/TR/CSS21/ui.html#dynamic-outlines">section 18.4</a>
of Cascading Style Sheets, level 2, revision 1 <a data-link-type="biblio" href="#biblio-css21">[CSS21]</a>
<li><a href="http://www.w3.org/TR/2000/WD-css3-userint-20000216">User Interface for CSS3 (16 February 2000)</a> <a data-link-type="biblio" href="#biblio-cssui">[CSSUI]</a>
</ul>
<h2 class="heading settled" data-level="3" id="box-model"><span class="secno">3. </span><span class="content">Box Model addition</span><a class="self-link" href="#box-model"></a></h2>
<h3 class="heading settled" data-level="3.1" id="box-sizing"><span class="secno">3.1. </span><span class="content"><a class="property" data-link-type="propdesc" href="#propdef-box-sizing">box-sizing</a> property</span><a class="self-link" href="#box-sizing"></a></h3>
<table class="propdef">
<tbody>
<tr>
<th>Name:
<td><dfn class="css" data-dfn-type="property" data-export="" id="propdef-box-sizing">box-sizing<a class="self-link" href="#propdef-box-sizing"></a></dfn>
<tr>
<th>Value:
<td>
content-box |
padding-box |
border-box
<tr>
<th>Initial:
<td>content-box
<tr>
<th>Applies to: