discontinued / server · Files

CR-css3-ui-20040511 124 KB
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html401/strict.dtd">
<!-- the command line to process is this is:

     num -l 2 template.html | toc -l 2 | perl bin/htmlindex | perl \
       bin/propindex | perl bin/addcite -r '' template.html \
       >template-processed.html

     To do: add longdesc

-->

<html>
<head>
<meta content="text/html; charset=iso-8859-1" http-equiv="Content-Type">

<meta content="text/css" http-equiv="Content-Style-Type">

<meta content="en" http-equiv="Content-Language">

<meta content="Tantek &Ccedil;elik" lang="tr" name="author">

<title>CSS3 Basic User Interface Module</title>

<link href="default.css" rel="stylesheet" title="Default" type="text/css">

<style type="text/css">
.subtoc ul,.subtoc ol { list-style-type: none }
ol.objectives { list-style: decimal }
ol.issues { list-style: decimal }
.html4ss { font-size:90%}
table.twod { border: solid 2px #777; font-family:sans-serif; font-size:9px }
table.twod td { border: solid 1px #777; font-family:sans-serif; font-size:9px }
table.twod th { font-size:10px; font-weight:bold }
h1 {font-size:200%; clear:both}
h2 {font-size:170%; clear:both}
h3 {font-size:150%; clear:both}
h4 {font-size:130%}
h5 {font-size:120%}
h6 {font-size:110%}
h1+h2 {page-break-before: avoid}
h2 {page-break-before: always}
dd p:first-child { margin-top:0 }

table.tprofile th.title {background:gray; color:white}
table.tprofile th { width:29%;padding:2px }
table.tprofile td { width:71%;padding:2px }

table#egappearance td:first-child { text-align:center; line-height:1.5 }
table#egappearance label { white-space:nowrap }
table#egappearance fieldset { line-height:1.4 }
table#egappearance legend { line-height:1.1 }

</style>

<link href="http://www.w3.org/StyleSheets/TR/W3C-CR" rel="stylesheet"
type="text/css">

<body>
<div class="head"> <a href="http://www.w3.org/"><img alt="W3C" height="48"
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<h1 id="css3-basic">CSS3 Basic User Interface Module</h1>

<h2 class="no-num no-toc" id="w3c-candidate">W3C Candidate Recommendation 11
May 2004</h2>

<dl>
<dt>This version:

<dd><a
href="http://www.w3.org/TR/2004/CR-css3-ui-20040511">http://www.w3.org/TR/2004/CR-css3-ui-20040511</a>

<dt>Latest version:

<dd><a href="http://www.w3.org/TR/css3-ui">http://www.w3.org/TR/css3-ui</a>

<dt>Previous version:

<dd><a
href="http://www.w3.org/TR/2003/WD-css3-ui-20030703/">http://www.w3.org/TR/2003/WD-css3-ui-20030703/</a>

<dt>Editor:

<dd><span lang="tr">Tantek &Ccedil;elik</span> (<span class="company"><a
href="http://www.microsoft.com/">Microsoft Corporation</a></span>) &lt;<a
href="mailto:tantekc@microsoft.com">tantekc@microsoft.com</a>&gt;
</dl>
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<h2 class="no-num no-toc" id="abstract">Abstract</h2>

<p>This section is <em>informative</em>.

<p>CSS (Cascading Style Sheets) is a language for describing the rendering of
HTML and XML documents on screen, on paper, in speech, etc. It uses various
selectors, properties and values to style basic user interface elements in a
document. This specification describes those user interface related
selectors, properties and values that are proposed for CSS level&nbsp;3 to
style HTML and XML (including XHTML and XForms). It includes and extends user
interface related features from the selectors, properties and values of CSS
level&nbsp;2 revision 1 and Selectors specifications.

<h2 class="no-num no-toc" id="status" style="page-break-before:auto">Status
of this document</h2>

<p>This section is <em>normative</em>.

<p><em>This section describes the status of this document at the time of its
publication. Other documents may supersede it. A list of current W3C
publications and the latest revision of this technical report can be found in
the <a href="http://www.w3.org/TR/">W3C technical reports index at
http://www.w3.org/TR/</a>.</em>

<p>This is a W3C Candidate Recommendation, which means the specification has
been widely reviewed and W3C recommends that it be implemented. It will
remain Candidate Recommendation <a href="#crec">at least until 11 November
2004.</a>

<p>Publication as a Candidate Recommendation does not imply endorsement by
the W3C Membership. It is inappropriate to cite this document as other than
work in progress.

<p>To find the latest version of this specification, please follow the
"Latest version" link above, or visit the list of W3C <a
href="http://www.w3.org/TR">Technical Reports</a>.

<p>A <a href="/Style/CSS/Test/">test suite</a> and a <a
href="/Style/css3-updates/css3-ui-implementations">report on
implementations</a> will be provided before the document becomes a Proposed
Recommendation.

<p>The (<a
href="http://lists.w3.org/Archives/Public/www-style/">archived</a>) public
mailing list <a href="mailto:www-style@w3.org">www-style@w3.org</a> (see <a
href="http://www.w3.org/Mail/Request">instructions</a>) is preferred for
discussion of this and other specifications in the Style area. When
commenting on this document, please put the text "CSS3UI" in the subject,
preferably like this: "[CSS3UI] &lt;summary of comment&gt;"

<p>This document is 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>, see <a
href="http://www.w3.org/Style/Activity">summary</a>).

<p>Patent disclosures relevant to CSS may be found on the Working Group's
public <a href="http://www.w3.org/Style/CSS/Disclosures">patent disclosure
page.</a> The document was developed under the <a
href="http://www.w3.org/TR/2002/NOTE-patent-practice-20020124">24 January
2002 CPP</a> as amended by the <a
href="http://www.w3.org/2004/02/05-pp-transition">W3C Patent Policy
Transition Procedure.</a>

<h3 class="no-num no-toc" id="crec">Candidate Recommendation Exit Criteria</h3>

<p>For this specification to exit the CR stage, the following conditions must
be met:

<ol>
<li>
<p>There must be at least two interoperable implementations for every
feature. For the purposes of this criterion, we define the following terms:</p>

<dl>
<dt>feature

<dd>
<p> A section or subsection of the specification.</p>

<dt>interoperable

<dd>
<p>passing the respective test cases in the test suite, or, if the
implementation is not a web browser, equivalent tests. Every relevant test in
the test suite should have an equivalent test created if such a user agent
(UA) is to be used to claim interoperability. In addition if such a UA is to
be used to claim interoperability, then there must one or more additional UAs
which can also pass those equivalent tests in the same way for the purpose of
interoperability. The equivalent tests must be made publicly available for
the purposes of peer review.</p>

<dt>implementation

<dd>
<p>a user agent which:</p>

<ol>
<li>implements the feature.

<li>is available (i.e. publicly downloadable or available through some other
public point of sale mechanism). This is the "show me" requirement.

<li>is shipping (i.e. development, private or unofficial versions are
insufficient).

<li>is not experimental (i.e. is intended for a wide audience and could be
used on a daily basis).
</ol>
</dl>

<li>
<p>A minimum of six months of the CR period must have elapsed. This is to
ensure that enough time is given for any remaining major errors to be caught.

<li>
<p>The CR period will be extended if implementations are slow to appear.

<li>
<p>Features that are <em>at risk</em> (see the below list) will be dropped
(thus reducing the list of "all" features mentioned above) if two or more
interoperable implementations of those features are not found by the end of
the CR period, or if sufficient and adequate tests (by judgment of the
Working Group) have not been produced for those features by the end of the CR
period.
</ol>

<h3 class="no-num no-toc" id="atrisk">Features at risk</h3>

<p>The Working Group has identified the following features as at risk of
being removed from CSS3 Basic User Interface when exiting CR. Implementors
are urged to implement these features, if they wish to see these features
remain in this specification. All other features are either defined in a
normative reference (e.g. CSS 2.1 <a href="#CSS21"
rel="biblioentry">[CSS21]</a> or Selectors <a href="#SELECT"
rel="biblioentry">[SELECT]</a>), or dependencies for another specification
(e.g. XForms <a href="#XFORMS10" rel="biblioentry">[XFORMS10]</a>) or are
believed to have one or more implementations (perhaps experimental), and thus
will not be dropped without returning to last call.

<ul><!-- Not at risk:
 <li>CSS2.1:  		:hover :active :focus</li>
 <li>Selectors:		:enabled :disabled :checked :indeterminate ::selection</li>
 <li>XForms needs:	:default :valid :invalid :in-range :out-of-range :required :optional :read-only :read-write ::value ::choices ::repeat-item ::repeat-index</li>

 <li>appearance:
	 	Moz implements: 
	 		checkbox tab tooltip window dialog menubar
	 		none(same as normal) button(same as push-buttom) radio(same as radio-button) menupopup(same as pop-up-menu) menuitem(same as menu-item)
	 		checkboxcontainer(same as checkbox-group?) radiocontainer(same as radio-group?)
	 		treeview(same as outline-tree?) textfield(same as field) menulist(same as list-menu?) slider(same as range?) menulist(same as pull-down-menu?)
	 		listbox? listitem? 
	 		hyperlink (with a different mechanism?)
	 	XForms asked for and/or needs:
	 		combo-box signature password
 		Required generic values:
 			icon button menu
 		Necessary to replace old CSS3 Color values, so they can be deprecated
 			document workspace desktop
 </li>
 <li>box-sizing implemented by IE5/Mac, Opera
 		-moz-box-sizing implemented by Mozilla
 </li>
 <li>outline, outline-width, outline-color, outline-style all in CSS 2.1</li>
 <li>outline-offset property
 		implemented by Safari 1.2
 </li>
 <li>cursor property:
 		CSS2.1: auto | default | help | pointer | wait | crosshair | text | 
e-resize | n-resize | ne-resize | nw-resize | s-resize | se-resize | sw-resize | w-resize
		IE5/Mac implements: none | progress | cell
		IE6/Windows implements: <uri> | progress | not-allowed | no-drop | vertical-text | all-scroll | col-resize | row-resize | move | 
		Mozilla implements: progress | cell(as -moz-cell) | alias(as -moz-alias) | copy(as -moz-copy) | context-menu(as -moz-context-menu) | 
		freedesktop.org copied all the cursors from the CSS3-UI LC Working Draft
			by FredrikHoeglund - 14 Oct 2003 
			http://freedesktop.org/Standards/cursor-spec
 </li>
 <li>nav-* properties
 		implemented by Tasman v1, internal implementation
 		required (depended on) by DVB-HTML, ATSC standards
 </li> 
 -->

<li>'cursor' property values: ew-resize | ns-resize | nesw-resize |
nwse-resize

<li>'font' property values: window | document | workspace | desktop | tooltip
| dialog | button | push-button | hyperlink | radio-button | checkbox |
menu-item | tab | menubar | pull-down-menu | pop-up-menu | list-menu |
radio-group | checkbox-group | outline-tree | range | field | combo-box |
signature | password

<li>'content' property value: icon

<li>'icon' property

<li>'resize' property
</ul>

<h2 class="no-num no-toc" id="summary">Overview</h2>

<p>This section is <em>informative</em>.

<p>This document is one of the "modules" for the upcoming CSS3 specification.
It not only describes the user interface related properties and values that
already exist in <a href="http://www.w3.org/TR/REC-CSS1">CSS1</a> <a
href="#CSS1" rel="biblioentry">[CSS1]</a> and <a
href="http://www.w3.org/TR/CSS21">CSS2.1</a> <a href="#CSS21"
rel="biblioentry">[CSS21]</a>, but introduces new properties and values for
CSS3 as well. The Working Group doesn't expect that all implementations of
CSS3 will implement all properties or values. Instead, there will probably be
a small number of variants of CSS3, so-called "profiles".

<p>This document is the result of the merging of relevant parts of the
following Recommendations and Working Drafts, and the addition of some new
features.

<ul>
<li>Cascading Style Sheets, level 2, revision 1 <a href="#CSS21"
rel="biblioentry">[CSS21]</a>

<li>User Interface for CSS3 (16 February 2000) <a href="#CSSUI"
rel="biblioentry">[CSSUI]</a>
</ul>

<p>This specification contains:

<ul>
<li>Pseudo-classes and pseudo-elements to style user interface states and
element fragments respectively.

<li>Additions to the user interface features in <a
href="http://www.w3.org/TR/CSS21">CSS2.1</a>.

<li>The ability to style the appearance of various standard form elements in
languages such as HTML/XHTML/XForms (and properties to augment or replace
some of the remaining stylistic attributes in HTML4/XHTML1).

<li>Directional focus navigation properties.

<li>A mechanism to allow the styling of elements as icons for accessibility.
</ul>

<h2 class="no-num no-toc" id="contents">Table of contents</h2>
<!--begin-toc-->

<ul class="toc">
<li><a href="#intro"><span class="secno">1. </span>Introduction</a>
<ul class="toc">
<li><a href="#purpose"><span class="secno">1.1. </span>Purpose</a>

<li><a href="#scope"><span class="secno">1.2. </span>Scope</a>
</ul>

<li><a href="#conformance"><span class="secno">2. </span>Conformance</a>
<ul class="toc">
<li><a href="#definitions"><span class="secno">2.1. </span>Definitions</a>

<li><a href="#classes"><span class="secno">2.2. </span>Classes of
products</a>

<li><a href="#profiles"><span class="secno">2.3. </span>Profiles</a>

<li><a href="#extensions"><span class="secno">2.4. </span>Extensions</a>
</ul>

<li><a href="#dependencies"><span class="secno">3. </span>Dependencies on
other modules</a>

<li><a href="#user-interface"><span class="secno">4. </span>User Interface
Selectors</a>
<ul class="toc">
<li><a href="#pseudo-classes"><span class="secno">4.1. </span>User interface
states: pseudo-classes</a>
<ul class="toc">
<li><a href="#active"><span class="secno">4.1.1. </span>:active details</a>

<li><a href="#pseudo-default"><span class="secno">4.1.2. </span>:default</a>

<li><a href="#pseudo-validity"><span class="secno">4.1.3.
</span><span>:valid</span> and <span>:invalid</span></a>

<li><a href="#pseudo-range"><span class="secno">4.1.4.
</span><span>:in-range</span> and <span>:out-of-range</span></a>

<li><a href="#pseudo-required-value"><span class="secno">4.1.5.
</span><span>:required</span> and <span>:optional</span></a>

<li><a href="#pseudo-ro-rw"><span class="secno">4.1.6.
</span><span>:read-only</span> and <span>:read-write</span></a>
</ul>

<li><a href="#pseudo-elements"><span class="secno">4.2. </span>User interface
element fragments: pseudo-elements</a>
<ul class="toc">
<li><a href="#pseudo-value"><span class="secno">4.2.1. </span>::value</a>

<li><a href="#pseudo-choices"><span class="secno">4.2.2. </span>::choices</a>

<li><a href="#pseudo-repeat-item"><span class="secno">4.2.3.
</span>::repeat-item</a>

<li><a href="#pseudo-repeat-index"><span class="secno">4.2.4.
</span>::repeat-index</a>
</ul>
</ul>

<li><a href="#system"><span class="secno">5. </span>System Appearance</a>
<ul class="toc">
<li><a href="#appearance-val"><span class="secno">5.1. </span>Appearance
values</a>

<li><a href="#appearance"><span class="secno">5.2. </span><span
class="property">'appearance'</span> property</a>

<li><a href="#system0"><span class="secno">5.3. </span>System fonts</a>
</ul>

<li><a href="#element"><span class="secno">6. </span>Element icons</a>
<ul class="toc">
<li><a href="#content0"><span class="secno">6.1. </span><span
class="property">'content'</span> property addition</a>

<li><a href="#icon-property"><span class="secno">6.2. </span><span
class="property">'icon'</span> property</a>
</ul>

<li><a href="#box-model"><span class="secno">7. </span>Box Model addition</a>

<ul class="toc">
<li><a href="#box-sizing"><span class="secno">7.1. </span><span
class="property">'box-sizing'</span> property</a>
</ul>

<li><a href="#outline1"><span class="secno">8. </span>Outline properties</a>
<ul class="toc">
<li><a href="#outline"><span class="secno">8.1. </span><span
class="property">'outline'</span> property</a>

<li><a href="#outline-width"><span class="secno">8.2. </span><span
class="property">'outline-width'</span> property</a>

<li><a href="#outline-style"><span class="secno">8.3. </span><span
class="property">'outline-style'</span> property</a>

<li><a href="#outline-color"><span class="secno">8.4. </span><span
class="property">'outline-color'</span> property</a>

<li><a href="#outline-offset"><span class="secno">8.5. </span><span
class="property">'outline-offset'</span> property</a>
</ul>

<li><a href="#resizing"><span class="secno">9. </span>Resizing</a>
<ul class="toc">
<li><a href="#resize"><span class="secno">9.1. </span><span
class="property">'resize'</span> property</a>
</ul>

<li><a href="#mouse"><span class="secno">10. </span>Mouse and Keyboard</a>
<ul class="toc">
<li><a href="#cursor"><span class="secno">10.1. </span><span
class="property">'cursor'</span> property</a>

<li><a href="#keyboard"><span class="secno">10.2. </span>Keyboard control</a>

<ul class="toc">
<li><a href="#nav-index"><span class="secno">10.2.1. </span>Sequential
navigation order: the <span class="property">'nav-index'</span> property</a>

<li><a href="#nav-dir"><span class="secno">10.2.2. </span>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</a>
</ul>
</ul>

<li><a href="#acknowledgments">Appendix A. Acknowledgments</a>

<li><a href="#references">Appendix B. Bibiliography</a>

<li><a href="#changes">Appendix C. Changes</a>

<li><a href="#appendix">Appendix D. Default style sheet additions for
HTML4/XHTML1</a>

<li><a href="#appendix0">Appendix E. Example profiles</a>

<li><a href="#appendix1">Appendix F: Test Suite</a>

<li><a href="#index">Index</a>

<li><a href="#property">Property index</a>
</ul>
<!--end-toc-->

<hr>

<h2 id="intro"><span class="secno">1. </span>Introduction</h2>

<p>This section is <em>normative</em>.

<p> CSS3 is a set of modules, divided up and profiled in order to simplify
the specification, and to allow implementors the flexibility of supporting
the particular modules appropriate for their implementations.

<p> This module describes selectors and CSS properties which enable authors
to style user interface related states, element fragments, properties and
values.

<p><a href="http://www.w3.org/TR/REC-CSS1#anchor-pseudo-classes">Section 2.1
of CSS1</a> <a href="#CSS1" rel="biblioentry">[CSS1]</a> and <a
href="http://www.w3.org/TR/CSS2/ui.html">Chapter 18 of CSS2</a> <a
href="#CSS2" rel="biblioentry">[CSS2]</a> introduced several user interface
related pseudo-classes, properties and values. <a
href="http://www.w3.org/TR/css3-selectors/#UIstates">Section 6.6.4 of
Selectors</a> <a href="#SELECT" rel="biblioentry">[SELECT]</a> also describes
several additional user interface related pseudo-classes (and one
pseudo-element).

<p> This Working Draft extends them to provide the ability, through CSS, to
style elements based upon additional user interface states, to style
fragments of user interface elements, and to alter the dynamic presentation
of elements in ways previously only available through specific HTML4/XHTML1
elements and attributes.

<h3 id="purpose"><span class="secno">1.1. </span>Purpose</h3>

<p>The purpose of this specification is to achieve the following objectives:

<ul>
<li>Extend the user interface features in CSS2.1.

<li>Provide additional CSS mechanisms to simulate the appearance of various
standard form elements.

<li>Provide additional CSS mechanisms to augment or replace other dynamic
presentation related features in HTML4/XHTML1.

<li>Introduce directional navigation properties to assist in the construction
of user interfaces which make use of a directional navigation model.

<li>Introduce properties and values to specify icon presentations for
elements to enhance accessibility.
</ul>

<h3 id="scope"><span class="secno">1.2. </span>Scope</h3>

<p>This proposal specifies how to alter the look and feel of various
elements, and specifically does not address the meaning behind what a
specific look and feel may imply. For example, with the additions in the
proposal, an author can make any element look and even feel like a submit
button. Yet, that arbitrary element is not afforded any additional meaning,
so pushing it does nothing by default, and certainly does not submit a form.

<p> Similarly, the HTML4 <code>&lt;SELECT&gt;</code> element for example,
provides a list or menu of choices to the user. The meaning of the HTML4
<code>&lt;SELECT&gt;</code> element is that it allows the user to make a
choice, to choose something among several alternatives. This says nothing
about its look and feel, and in fact, the "concept" of a HTML4
<code>&lt;SELECT&gt;</code> could be visually implemented as a list-box, a
popup-menu, or a group of radio-buttons. Or a group of HTML4 checkboxes
(<code>&lt;INPUT type="checkbox"&gt;</code>) could be styled to appear as a
group of radio-buttons, and yet, since those elements are still semantic
checkboxes, they can still be individually checked or unchecked, rather than
acquiring any kind of radio-button group semantic where only one can be
checked.

<p> Each example of presentation has a different look and feel, but maintains
its original meaning, a choice (or choices) among several alternatives. This
proposal addresses only the former (look and feel), not the latter (meaning).

<p> Since this proposal serves to simulate the appearance of various user
interface and forms elements in HTML4/XHTML, it is perhaps useful to call out
what specifically is believed to be outside the scope of CSS, or better
suited to document structure rather than style and therefore not addressed by
this proposal:

<ul>
<li>Form semantics, including, but not limited to, submission, resetting,
naming, what determines a successful or valid form control, and how to
process form data.

<li>Form contents, including, but not limited to initial value, current
value, and form content types. The HTML4 '<code>maxlength</code>' attribute,
for example, determines the maximum number of characters the user can enter
into an <code>&lt;INPUT type="text"&gt;</code> or <code>&lt;INPUT
type="password"&gt;</code> field, and as such is a content constraint rather
than a presentational suggestion.

<li>Form control dependencies, including, but not limited to, whether only
one option from a set of choices may be chosen, or whether multiple options
may be chosen.

<li>The HTML4/XHTML1 <code>&lt;form&gt;</code> element and its unique
attributes ('<code>action</code>', '<code>method</code>',
'<code>enctype</code>', '<code>accept</code>',
'<code>accept-charset</code>').
</ul>

<p>In addition, this document does not attempt to solve all user interface
related issues / features that can be found in modern user interfaces.
Perhaps future versions may attempt to solve these. For example:

<ul>
<li>Complex or composite controls (e.g. the HTML4 <code>&lt;INPUT
type="file"&gt;</code> and the <code>&lt;ISINDEX&gt;</code> elements).

<li>The appearance, styling and coloring of scrollbars.

<li>Window layering. There is no attempt made to distinguish the appearance
of elements in the front-most window versus non-front-most windows. The
semantics of window layering must be addressed before it is appropriate to
attempt to style such concepts.

<li>Palettes and floating windows. Along with the concept of "frontmost"
window, windows that float but do not receive focus are also not addressed.

<li>Browser window chrome and toolbars.

<li>The default styling of the HTML4/XHTML1 <code>&lt;fieldset&gt;</code>,
<code>&lt;legend&gt;</code>, <code>&lt;frame&gt;</code> and
<code>&lt;frameset&gt;</code> elements.

<li>Frame-resizing behavior. The behavior of <code>&lt;frame&gt;</code> and
<code>&lt;frameset&gt;</code>, specifically the ability to "share"
resizability when elements share a border, perhaps by leveraging the
border-collapse property is also not addressed.
</ul>

<h2 id="conformance"><span class="secno">2. </span>Conformance</h2>

<p>This section is <em>normative</em>.

<h3 id="definitions"><span class="secno">2.1. </span>Definitions</h3>

<p>The key words <span class="index-def" id="must"
title="MUST">"MUST"</span>, <span class="index-def" id="must-not" title="MUST
NOT">"MUST NOT"</span>, <span class="index-def" id="required"
title="REQUIRED">"REQUIRED"</span>, <span class="index-def" id="shall"
title="SHALL">"SHALL"</span>, <span class="index-def" id="shall0"
title="SHALL NOT">"SHALL NOT"</span>, <span class="index-def" id="should"
title="SHOULD">"SHOULD"</span>, <span class="index-def" id="should0"
title="SHOULD NOT">"SHOULD NOT"</span>, <span class="index-def"
id="recommended" title="RECOMMENDED">"RECOMMENDED"</span>, <span
class="index-def" id="may" title="MAY">"MAY"</span>, and <span
class="index-def" id="optional" title="OPTIONAL">"OPTIONAL"</span> in this
document are to be interpreted as described in RFC&nbsp;2119 (see <a
href="#RFC2119" rel="biblioentry">[RFC2119]</a>). However, for readability,
these words do not typically appear in all uppercase letters in this
specification.

<p>Additional key words, e.g. "User agent (UA)", are <a
href="http://www.w3.org/TR/CSS21/conform.html#q1">defined by CSS 2.1</a> (<a
href="#CSS21" rel="biblioentry">[CSS21]</a>, section 3.1).

<h3 id="classes"><span class="secno">2.2. </span>Classes of products</h3>

<p>The following classes of products (many of which overlap) should consider
implementing this specification:

<ul>
<li>Web browsers

<li>User agents that implement one or more of the following types of content:
HTML (e.g. <a href="#HTML401" rel="biblioentry">[HTML401]</a>), XHTML (e.g.
<a href="#XHTML10" rel="biblioentry">[XHTML10]</a>, <a href="#XHTML11"
rel="biblioentry">[XHTML11]</a>), XForms (e.g. <a href="#XFORMS10"
rel="biblioentry">[XFORMS10]</a>), SVG (e.g. <a href="#SVG10"
rel="biblioentry">[SVG10]</a>, <a href="#SVG11"
rel="biblioentry">[SVG11]</a>) or other content languages that contain forms
controls or are intended for user interaction

<li>User agents that implement one or more levels, modules and or profiles of
CSS (e.g. <a href="#CSS1" rel="biblioentry">[CSS1]</a>, <a href="#CSS21"
rel="biblioentry">[CSS21]</a>)
</ul>

<h3 id="profiles"><span class="secno">2.3. </span>Profiles</h3>

<p>This specification contains a number of informative profiles. These
profiles are not mandatory for conformance.

<h3 id="extensions"><span class="secno">2.4. </span>Extensions</h3>

<p>This specification does not define any explicit extension mechanisms. If
an implementation needs to extend the functionality of this specification, it
must follow any/all guidelines and requirements of extensions as defined in
CSS2.1, e.g. <a
href="http://www.w3.org/TR/CSS21/syndata.html#q4">Vendor-specific
extensions</a> (<a href="#CSS21" rel="biblioentry">[CSS21]</a>, section
4.1.2).

<h2 id="dependencies"><span class="secno">3. </span>Dependencies on other
modules</h2>

<p>This section is <em>normative</em>.

<p>This CSS3 module depends on the following other specifications. Some of
these specifications may be in their "Candidate Recommendation" phase. If
this module depends on feature or portion of such a specification which ends
up being dropped during their "CR" phase(s), then such feature or portion
thereof will be presumed to be incorporated into this specification. For
example, if the ":indeterminate" selector was dropped from Selectors, then
the definition and description of ":indeterminate" would be incorporated into
the next draft of this specification.

<ul>
<li><a href="#SELECT" rel="biblioentry">[SELECT]</a>

<li><a href="#CSS3COLOR" rel="biblioentry">[CSS3COLOR]</a>

<li><a href="#CSS21" rel="biblioentry">[CSS21]</a>
</ul>
<!--
<p>It has non-normative (informative) references to the following
other specifications:</p>
<ul>
</ul>
-->

<p> The following work is related to the CSS3 Module Basic User Interface
Working Draft.

<ul>
<li><a href="#HTML401" rel="biblioentry">[HTML401]</a>

<li><a href="#UAAG10" rel="biblioentry">[UAAG10]</a>

<li><a href="#XML10" rel="biblioentry">[XML10]</a>

<li><a href="#XHTML10" rel="biblioentry">[XHTML10]</a>

<li><a href="#XHTML11" rel="biblioentry">[XHTML11]</a>

<li><a href="#XFORMS10" rel="biblioentry">[XFORMS10]</a>
</ul>

<p>This specification does not define what is a form element.

<h2 id="user-interface"><span class="secno">4. </span>User Interface
Selectors</h2>

<p>This section is <em>normative</em>.

<h3 id="pseudo-classes"><span class="secno">4.1. </span>User interface
states: pseudo-classes</h3>

<p>The Selectors specification <a
href="http://www.w3.org/TR/css3-selectors/#UIstates">defines several user
interface selectors</a> (<a href="#SELECT" rel="biblioentry">[SELECT]</a>,
sections 6.6.1 and 6.6.4) which represent user interface states:

<ul>
<li id="psuedo-hover"><a
href="http://www.w3.org/TR/css3-selectors/#useraction-pseudos">:hover</a>

<li id="pseudo-active"><a
href="http://www.w3.org/TR/css3-selectors/#useraction-pseudos">:active</a>

<li id="pseudo-focus"><a
href="http://www.w3.org/TR/css3-selectors/#useraction-pseudos">:focus</a>

<li id="pseudo-enabled"><a
href="http://www.w3.org/TR/css3-selectors/#enableddisabled">:enabled</a>

<li id="pseudo-disabled"><a
href="http://www.w3.org/TR/css3-selectors/#enableddisabled">:disabled</a>

<li id="pseudo-checked"><a
href="http://www.w3.org/TR/css3-selectors/#checked">:checked</a>

<li id="pseudo-indeterminate"><a
href="http://www.w3.org/TR/css3-selectors/#indeterminate">:indeterminate</a>
</ul>

<p>These pseudo-classes as defined by <a href="#SELECT"
rel="biblioentry">[SELECT]</a> are included in this specification by
reference.

<p>CSS 2.1 <a href="#CSS21" rel="biblioentry">[CSS21]</a> specifies
additional details for some of the selectors mentioned, above and beyond
Selectors.

<h4 id="active"><span class="secno">4.1.1. </span>:active details</h4>

<p>In addition, on systems with more than one mouse button, :active is
clarified to apply only to the primary or primary activation button
(typically the "left" mouse button), and any aliases thereof.

<div class="example">
<p style="display:none">Example(s):</p>

<h4 class="no-num no-toc" id="restyling">restyling a checkbox</h4>

<p> Authors may wish to completely redo the styling of a form control, such
as a checkbox. This can be achieved using several of the above pseudo-classes
and the '<span class="value">normal</span>' value for the <span
class="property"><a href="#appearance0">'appearance'</a></span> property
which is explained later in this specification. In this example, checkboxes
with a class of "redone" are styled with specific background images according
to their respective user interface states using one or more pseudo-classes.</p>

<pre><code class="css">
input[type=checkbox] { 
  appearance:checkbox; /* expected from UA defaults */
}

input[type=checkbox].redone { 
  appearance:normal;  /* resets various properties */
  display:inline-block;
  width:20px; height:20px; 
  background:url(customuncheckedimage.png);
}

input[type=checkbox].redone:active {
  background:url(customuncheckedactiveimage.png);
}

input[type=checkbox].redone:checked {
  background:url(customcheckedimage.png);
}

input[type=checkbox].redone:checked:active {
  background:url(customcheckedactiveimage.png);
}

input[type=checkbox].redone:disabled {
  background:url(customdisableduncheckedimage.png);
}

input[type=checkbox].redone:disabled:checked {
  background:url(customdisabledcheckedimage.png);
}
</code></pre>
</div>

<h4 class="no-num no-toc" id="new-user">New user interface state
pseudo-classes</h4>

<p>In addition to the above-mentioned pseudo-classes, this specification
introduces several new pseudo-classes to define additional user interface
states.

<ul>
<li>:default

<li>:valid

<li>:invalid

<li>:in-range

<li>:out-of-range

<li>:required

<li>:optional

<li>:read-only

<li>:read-write
</ul>

<p>Specifically, these new states (except for :default) are provided as a way
to style elements which are in the respective states as defined by XForms <a
href="#XFORMS10" rel="biblioentry">[XFORMS10]</a>.

<h4 id="pseudo-default"><span class="secno">4.1.2. </span>:default</h4>

<p>The :default selector applies to the one or more UI elements that are the
default among a set of similar elements. Typically applies to context menu
items, buttons and select lists/menus.

<p> One example is the default submit button among a set of buttons. Another
example is the default option from a popup menu. Multiple elements in a
select-many group could have multiple :default elements, like a selection of
pizza toppings for example.

<h4 id="pseudo-validity"><span class="secno">4.1.3. </span><span
id="pseudo-valid">:valid</span> and <span id="pseudo-invalid">:invalid</span></h4>

<p>An element is :valid or :invalid when it is, respectively, valid or
invalid with respect to data validity semantics defined by a different
specification (e.g. <a href="#XFORMS10" rel="biblioentry">[XFORMS10]</a>). An
element which lacks data validity semantics is neither :valid nor :invalid.
This is different from an element which otherwise has no constraints. Such an
element would always be :valid.

<h4 id="pseudo-range"><span class="secno">4.1.4. </span><span
id="pseudo-in-range">:in-range</span> and <span
id="pseudo-out-of-range">:out-of-range</span></h4>

<p> The :in-range and :out-of-range pseudo-classes apply only to elements
that have range limitations. An element is :in-range or :out-of-range when
the value that the element is bound to is in range or out of range of the
presentation (e.g. visual or spoken representation) of the element
respectively. An element that lacks data range limits or is not a form
control is neither :in-range nor :out-of-range. E.g. a slider element with a
value of 11 presented as a slider control that only represents the values
from 1-10 is :out-of-range. Another example is a menu element with a value of
"E" that happens to be presented as a popup menu that only has choices "A",
"B" and "C".

<h4 id="pseudo-required-value"><span class="secno">4.1.5. </span><span
id="pseudo-required">:required</span> and <span
id="pseudo-optional">:optional</span></h4>

<p>A form element is :required or :optional if a value for it is,
respectively, required or optional before the form it belongs to is
submitted. Elements that are not form elements are neither required nor
optional.

<h4 id="pseudo-ro-rw"><span class="secno">4.1.6. </span><span
id="pseudo-read-only">:read-only</span> and <span
id="pseudo-read-write">:read-write</span></h4>

<p>An element whose contents are not user-alterable is :read-only. However,
elements whose contents are user-alterable (such as text input fields) are
considered to be in a :read-write state. In typical documents, most elements
are :read-only. However it may be possible (e.g. in the context of an editor)
for any element to become :read-write.

<h3 id="pseudo-elements"><span class="secno">4.2. </span>User interface
element fragments: pseudo-elements</h3>

<p>Selectors (<a href="#SELECT" rel="biblioentry">[SELECT]</a>, section 7.3)
also defines one user interface element fragment selector:

<ul>
<li id="pseudo-selection"><a
href="http://www.w3.org/TR/css3-selectors/#selection">::selection</a>
</ul>

<p>This pseudo-element is included in this specification as defined by <a
href="#SELECT" rel="biblioentry">[SELECT]</a> by reference.

<p>In addition to the above-mentioned pseudo-element, this specification
introduces four new pseudo-elements to provide access to additional user
interface element fragments.

<ul>
<li>::value

<li>::choices

<li>::repeat-item

<li>::repeat-index
</ul>

<p>Specifically, these new pseudo-elements are provided as a way to style
user interface fragments as defined by XForms <a href="#XFORMS10"
rel="biblioentry">[XFORMS10]</a>.

<h4 id="pseudo-value"><span class="secno">4.2.1. </span>::value</h4>

<p>A form element may contain both a label for its data value, and the data
value itself. For such elements, the ::value pseudo-element selects the
representation of just the data value itself, in order to style its
appearance.

<div class="example">
<p style="display:none">Example(s):</p>

<h4 class="no-num no-toc" id="fictional">fictional markup and illustration</h4>

<p> Here is an example which illustrates the ::value of a text input field
with fictional markup which is then styled with CSS.</p>

<h5 class="no-num no-toc" id="sample">sample XForms fragment with fictional
markup:</h5>

<pre><code>
&lt;input&gt;
  &lt;label&gt;Zip code&lt;label&gt;
  <em>&lt;input::value/&gt;</em>
&lt;/input&gt;
</code></pre>

<h5 class="no-num no-toc" id="sample0">sample CSS:</h5>

<pre><code class="css">
input { border:dashed }
label { border:dotted }
input::value { border:solid }
</code></pre>

<h5 class="no-num no-toc" id="an-xhtmlcss">an (X)HTML+CSS approximation of
this example</h5>

<p> <span style="border:dashed;display:inline-block;padding:10px"> <label
style="border:dotted;display:inline-block;padding:2px;margin:0;font-size:1em">Zip
code</label> <input
style="border:solid;display:inline-block;padding:2px;margin:0;font-size:1em"
type="text" value="94117"> </span></p>

<p>Spacing (in the form of padding) has been added to the above approximation
to separate the borders and make the individual (pseudo-)elements easier to
distinguish.</p>
</div>

<h4 id="pseudo-choices"><span class="secno">4.2.2. </span>::choices</h4>

<p>Similarly, a form element which represents a list of options may contain
both a label for the list, and the list of choices itself. For such elements,
the ::choices pseudo-element selects the representation of just the list of
choices themselves, in order to style their appearance.

<p>A list of radio buttons can also be selected with the ::choices
pseudo-element, and the currently chosen radio button can be selected with
the ::value pseudo-element.

<h4 id="pseudo-repeat-item"><span class="secno">4.2.3. </span>::repeat-item</h4>

<p> The ::repeat-item pseudo-element represents a single item from a
repeating sequence. It is generated as a parent to all the elements in a
single repeating item. Each ::repeat-item is associated with a particular
instance data node, and is affected by the model item properties (e.g.
'<code>relevant</code>') found there, as the related style properties will
cascade to the child elements.

<h4 id="pseudo-repeat-index"><span class="secno">4.2.4. </span>::repeat-index</h4>

<p> The ::repeat-index pseudo-element represents the current item of a
repeating sequence. It takes the place of the ::repeat-item as a parent of
all the elements in the index repeating item.

<div class="note">
<p> <em><strong>Note.</strong> Any style declarations that an author wants to
apply to all repeat items, including the index, must be done so by using both
::repeat-item and ::repeat-index selectors. Styles that are only applied to
::repeat-item will not automatically be applied to the respective
::repeat-index. </em></p>
</div>

<div class="example">
<p style="display:none">Example(s):</p>

<h4 class="no-num no-toc" id="repeat-item">::repeat-item and ::repeat-index
fictional markup</h4>

<p> Here is an example that illustrates both ::repeat-item and
::repeat-index, since they are often both available and used at the same
time. Assume appropriate namespace declarations were made in a header
somewhere preceding the code in the example.</p>

<p>The following markup snippet uses XHTML and XForms:</p>

<pre><code lang="x-xhtml">
&lt;html:table xforms:repeat-nodeset="..."&gt;
   &lt;html:tr&gt;
      &lt;html:td&gt;&lt;xforms:input ref="..."/&gt;&lt;xforms:input ref="..."/&gt;&lt;/html:td&gt;
   &lt;/html:tr&gt;
&lt;/html:table&gt;
</code></pre>

<p> The following style rules are used to style all the repeated items and
the current repeated item.</p>

<pre><code class="css" lang="x-css">
html|tr::repeat-item { outline: medium solid; color:gray }
html|tr::repeat-index { outline: medium dashed; color:black }
</code></pre>

<p> The following fictional markup shows the state of the above markup when
through user interaction the XForm contains three of the repeated items,
where the third item is current.</p>

<pre><code lang="x-xhtml">
&lt;html:table xforms:repeat-nodeset="..."&gt;
 <em>&lt;html:tr::repeat-item&gt;</em>
  &lt;html:tr&gt;
   &lt;html:td&gt;&lt;xforms:input ref="..."/&gt;&lt;xforms:input ref="..."/&gt;&lt;/html:td&gt;
  &lt;/html:tr&gt;
 <em>&lt;/html:tr::repeat-item&gt;</em>
 <em>&lt;html:tr::repeat-item&gt;</em>
  &lt;html:tr&gt;
   &lt;html:td&gt;&lt;xforms:input ref="..."/&gt;&lt;xforms:input ref="..."/&gt;&lt;/html:td&gt;
  &lt;/html:tr&gt;
 <em>&lt;/html:tr::repeat-item&gt;</em>
 <em>&lt;html:tr::repeat-index&gt;</em>
  &lt;html:tr&gt;
   &lt;html:td&gt;&lt;xforms:input ref="..."/&gt;&lt;xforms:input ref="..."/&gt;&lt;/html:td&gt;
  &lt;/html:tr&gt;
 <em>&lt;/html:tr::repeat-index&gt;</em>
&lt;/html:table&gt;
</code></pre>
</div>

<div class="note">
<p> <em><strong>Note.</strong> The ::repeat-index pseudo-element takes the
place of the ::repeat-item rather than being nested inside as a separate
element. Thus just like :link or :visited are mutually exclusive for
selecting hyperlinks, only one will exist and apply to a particular repeated
item at any point.</em></p>
</div>

<div class="example">
<p style="display:none">Example(s):</p>

<h4 class="no-num no-toc" id="ui-selectors">UI selectors example from XForms
1.0</h4>

<p> The following <a
href="http://www.w3.org/TR/xforms/sliceF.html#id2645356">example from XForms
1.0</a> (<a href="#XFORMS10" rel="biblioentry">[XFORMS10]</a>, section F.3)
shows how basic styling can be accomplished on form controls and repeating
structures using the new pseudo-classes and XForms elements.</p>

<pre><code class="css">
@namespace xforms url(http://www.w3.org/2002/xforms);
/* Display a red background on all invalid form controls */
*:invalid { background-color:red; }
/* Display a red asterisk after all required form controls */
*:required::after { content: "*"; color:red; }
/* Do not render non-relevant form controls */
*:disabled { visibility: hidden; }
/* The following declarations cause form controls and their labels
to align neatly, as if a two-column table were used */
xforms|group { display: table; }
xforms|input { display: table-row; }
xforms|input &gt; xforms|label { display: table-cell; }
xforms|input::value { border: thin black solid; display: table-cell; }
/* Display an alert message when appropriate */
*:valid   &gt; xforms|alert { display: none; }
*:invalid &gt; xforms|alert { display: inline; }
/* Display repeat-items with a dashed border */
*::repeat-item,*::repeat-index { border: dashed; }
/* Display a teal highlight behind the current repeat item */
*::repeat-index { background-color: teal; }
</code></pre>
</div>

<h2 id="system"><span class="secno">5. </span>System Appearance</h2>

<p>This section is <em>normative</em>.

<h3 id="appearance-val"><span class="secno">5.1. </span>Appearance values</h3>

<p> CSS2 introduced the concept of system colors, which is a set of keywords
that allows authors to specify colors in a manner that integrates them into
the user's graphic environment. However, color is not the only property for
which native form controls have a default.

<p>The properties defined and extended in this section refer to the <dfn
id="ltappearancegt">&lt;appearance&gt;</dfn> value type, which may take one
of the following values which have been derived from the <a
href="http://www.w3.org/TR/CSS21/ui.html#system-colors">list of CSS2.1 System
Colors</a> (<a href="#CSS21" rel="biblioentry">[CSS21]</a>, section 18.2),
the list of <a href="http://www.w3.org/TR/html401/interact/forms.html">HTML4
form controls</a> (<a href="#HTML401" rel="biblioentry">[HTML401]</a>,
section 17), and additional typical platform user interface (UI) controls
(e.g. dialog window, icon):

<dl>
<dt><strong title="">icon</strong>

<dd>a small picture representing an object, often with a name or label.

<dt><strong>window</strong>

<dd>a viewport, a framed surface used to present objects and content for user
viewing and interaction. There are several specific types of windows:
<dl>
<dt><strong>desktop</strong>

<dd>a window used to represent a system as a whole that often contains other
windows.

<dt><strong>workspace</strong>

<dd>a window used to represent a project or application that may contain
other windows, typically with a titlebar that shows the name of the project
or application.

<dt><strong>document</strong>

<dd>a window used to represent a user document, typically with a titlebar
that shows its name. May also be used to represent folders or directories in
a file system.

<dt><strong>tooltip</strong>

<dd>a window that is used to temporarily display information or help about an
object. Also called "info" in the CSS2 system colors.

<dt><strong>dialog</strong>

<dd>a window used to present a notification or alternatives for the user to
choose as part of an action taken by the user. Also called "message-box" in
the CSS2 system fonts.
</dl>

<dt><strong>button</strong>

<dd>a small object usually labeled with text that represents a user choice
<dl>
<dt><strong>push-button</strong>

<dd>a button that has a border surrounding it, often beveled to appear three
dimensional, as if it is raised. Also called "caption" in CSS2 system fonts.

<dt><strong>hyperlink</strong>

<dd>a button that represents a hypertext link, often as simple as normal text
that is underlined and perhaps colored differently.

<dt><strong>radio-button</strong>

<dd>a button that displays whether or not it is checked with a small circle
next to the button label. There may be a disc inside the circle when the
button is checked. An indeterminate (neither checked nor unchecked) state may
be indicated with some other graphic in the circle.

<dt><strong>checkbox</strong>

<dd>a button that displays whether or not it is checked with a small box next
to the button label. There may be an 'x' or check mark inside the box when
the button is checked. An indeterminate (neither checked nor unchecked) state
may be indicated with a dash '-' or a square or some other graphic in the
box.

<dt><strong>menu-item</strong>

<dd>a choice within a menu, which may also act as a label for a nested
(hierarchical) menu.

<dt><strong>tab</strong>

<dd>a button representing the label for a pane in a tabbed interface.
</dl>

<dt><strong>menu</strong>

<dd>a set of options for the user to choose from, perhaps more than one at a
time. There are several specific types of menus.
<dl>
<dt><strong>menubar</strong>

<dd>a menu of menus, typically arranged linearly, in a horizontal bar.

<dt><strong>pull-down-menu</strong>

<dd>a menu where the name of the menu is displayed and the options remain
hidden until the user activates the menu. When the user releases or
deactivates the menu, the options are hidden again.

<dt><strong>pop-up-menu</strong>

<dd>a menu where all but the currently selected option remains hidden until
the user activates the menu. When the user releases or deactivates the menu,
all but the selected option are hidden again.

<dt><strong>list-menu</strong>

<dd>a list of options for the user to choose from, perhaps more than one at a
time.

<dt><strong>radio-group</strong>

<dd>a menu where the options are displayed as radio-buttons.

<dt><strong>checkbox-group</strong>

<dd>a menu where the options are displayed as checkboxes.

<dt><strong>outline-tree</strong>

<dd>a menu where the options can be shown or hidden with small widgets, often
represented by a small triangle or plus and minus signs.

<dt><strong>range</strong>

<dd>a control that displays the current option, perhaps graphically and
allows the user to select other options, perhaps by dragging a slider or
turning a knob.
</dl>

<dt><strong>field</strong>

<dd>an area provided for a user to enter or edit a value, typically using a
keyboard. There are several special fields.
<dl>
<dt><strong>combo-box</strong>

<dd>a field which is accompanied by a menu of preset values that can be used
to quickly enter common or typical values.

<dt><strong>signature</strong>

<dd>a field for entering a signature.

<dt><strong>password</strong>

<dd>a field for entering a password. Typically the text is rendered as a set
of bullets or boxes to obscure the value.
</dl>
</dl>

<p> Conforming user agents must support the five generic appearance values:
'<span class="value" title="">icon</span>', '<span
class="value">window</span>', '<span class="value">button</span>', '<span
class="value">menu</span>' and '<span class="property">field</span>'. If a
user agent or platform does not support a specific user interface element
(e.g. '<span class="value">dialog</span>'), it may apply the values for the
respective generic user interface element (e.g. '<span
class="value">window</span>').

<p class="note"><em><strong>Note.</strong> This specification recommends that
user agents allow users to override system appearance and font selections
with their own choices or proportions, within the user agent. See the User
Agent Accessibility Guidelines, specifically <a
href="http://www.w3.org/TR/UAAG10/guidelines.html#gl-user-control-styles">Ensure
user control of rendering</a> (<a href="#UAAG10"
rel="biblioentry">[UAAG10]</a>, section 2 guideline 4). </em>

<h3 id="appearance"><span class="secno">5.2. </span><span class="property"><a
href="#appearance0">'appearance'</a></span> property</h3>

<table class="propdef" id="nameappearance">
<tbody>
<tr>
<td><em>Name:</em>

<td><dfn id="appearance0">appearance</dfn>

<tr>
<td><em>Value: </em>

<td>normal | <a href="#appearance-val">&lt;appearance&gt;</a> | inherit

<tr>
<td><em>Initial:</em>

<td>normal

<tr>
<td><em>Applies to:</em>

<td>all elements

<tr>
<td><em>Inherited:</em>

<td>no

<tr>
<td><em>Percentages:</em>

<td>N/A

<tr>
<td><em>Media:</em>

<td>visual, interactive

<tr>
<td><em>Computed value:</em>

<td>specified value
</table>

<p>This document introduces the <span class="property"><a
href="#appearance0">'appearance'</a></span> property which can be used to
make an element look like a standard user interface element on the platform.

<div class="example">
<p style="display:none">Example(s):</p>

<h4 class="no-num no-toc" id="a-few">A few <span class="property"><a
href="#appearance0">'appearance'</a></span> values demonstrated using HTML4</h4>

<table border="1" id="egappearance">
<thead>
<tr>
<th style="width:10em"><span class="property"><a
href="#appearance0">'appearance'</a></span>

<th>HTML4 demonstration

<tbody>
<tr>
<td>normal

<td><span>hello</span>

<tr>
<td>button

<td>
<button>Search</button>

<tr>
<td>push-button

<td><input type="button" value="Sign up">

<tr>
<td>hyperlink

<td><a href="http://www.w3.org/Style/CSS/">CSS home page</a>

<tr>
<td>radio-button

<td><input id="sticky" type="radio"><label for="sticky">Sticky</label>

<tr>
<td>checkbox

<td><input id="giftwrap" type="checkbox"><label for="giftwrap">Gift
wrap</label>

<tr>
<td>pop-up-menu

<td><label for="pophoney">Honey</label> <select id="pophoney" size="1">
<option>Water White

<option>Extra White

<option>White

<option>Extra Light Amber

<option>Light Amber

<option selected>Amber

<option>Dark Amber
</select>

<tr>
<td>list-menu

<td> <label for="listhoney">Honey</label> <select id="listhoney" size="5">
<option>Water White

<option>Extra White

<option>White

<option>Extra Light Amber

<option>Light Amber

<option selected>Amber

<option>Dark Amber
</select>

<tr>
<td>radio-group

<td>
<fieldset>
<legend>tea</legend>
<input checked id="earl" name="teachoice" type="radio"><label for="earl">Earl
Grey</label> <input id="lemon" name="teachoice" type="radio"><label
for="lemon">lemon ginger</label> <input id="green" name="teachoice"
type="radio"><label for="green">green tea</label> <input id="jasmine"
name="teachoice" type="radio"><label for="jasmine">jasmine tea</label></fieldset>

<tr>
<td>checkbox-group

<td>
<fieldset>
<legend>pizza toppings</legend>
<input id="freshbasil" type="checkbox"><label for="freshbasil">fresh
basil</label> <input id="freshgarlic" type="checkbox"><label
for="freshgarlic">fresh garlic</label> <input id="freshspinach"
type="checkbox"><label for="freshspinach">fresh spinach</label> <input
id="greenpeppers" type="checkbox"><label for="greenpeppers">green
peppers</label> <input checked id="mushroom" type="checkbox"><label
for="mushroom">mushrooms</label> <input id="olives" type="checkbox"><label
for="olives">olives</label> <input checked id="onions" type="checkbox"><label
for="onions">onions</label> <input id="pineapple" type="checkbox"><label
for="pineapple">pineapple</label> <input checked id="tomatoes"
type="checkbox"><label for="tomatoes">tomatoes</label></fieldset>

<tr>
<td>field

<td><textarea cols="20" rows="3">Note to self.</textarea>

<tr>
<td>password

<td><input type="password" value="secret">
</table>
</div>

<h4 class="no-num no-toc" id="appearance1"><span class="property"><a
href="#appearance0">'appearance'</a></span> property details</h4>

<p> The <span class="property"><a href="#appearance0">'appearance'</a></span>
property is a shorthand for <span class="property"><a
href="#appearance0">'appearance</a></span>', <span
class="property">'color</span>', <span class="property"><a
href="#font">'font</a></span>', and <span class="property"><a
href="#cursor0">'cursor</a></span>'. It sets <span class="property"><a
href="#appearance0">'appearance'</a></span> to the specified value and the
other properties to their appropriate system value; '<span
class="value">normal</span>' resets <span class="property"><a
href="#appearance0">'appearance'</a></span> to '<span
class="value">normal</span>' and the others to '<span
class="value">inherit</span>'. The <span class="property"><a
href="#appearance0">'appearance'</a></span> property does not affect the
specified or computed values of any other properties.

<p> If <span class="property"><a href="#appearance0">'appearance'</a></span>
is not '<span class="value">normal</span>', the UA must render the element as
if it was the specified user interface (UI) control from the platform. The UA
should use the computed values of the <span
class="property">'background-*'</span>, <span
class="property">'border-*'</span>, <span
class="property">'padding-*'</span>, <span
class="property">'outline-*'</span>, and <span
class="property">'text-decoration'</span> properties when they do not have
their initial values and the computed values of <span
class="property">'color'</span>, <span class="property"><a
href="#font">'font'</a></span>, and <span class="property"><a
href="#cursor0">'cursor'</a></span> (whatever their values) to influence the
rendering where possible. Any values from those properties that cannot be
used to influence the rendering of the UI control must not affect the
rendering at all.

<p class="example"> For example, the UA should not draw a second border
around a UI control that already has a border.

<p> If <span class="property">'background-color'</span> or <span
class="property">'background-image'</span> have non-initial values and the UA
is using their values for influencing the rendering of the UI control, then
the UA must ensure that the <span class="property">'color'</span> property is
also used to influence the rendering. <!--
Similarly if <span class="property">'color'</span> is used to influence the rendering, then <span class="property">'background-color'</span> must be used to influence the rendering, and the other <span class="property">'background-*'</span> properties should be used to influence the rendering as well.
-->

<p> Other properties must not affect the handling of <span
class="property"><a href="#appearance0">'appearance'</a></span> and must
instead be applied according to normal CSS rules. In particular <span
class="property">'margin'</span>, <span class="property">'display'</span>,
<span class="property">'float'</span>, <span
class="property">'height'</span>, <span class="property">'width'</span>, and
<span class="property">'line-height'</span>, are not ignored and affect the
element as normal.

<p> This specification does not define the term "platform".

<p class="example"> For example, it could be the native graphical rendering
engine of the operating system, or it could be a user-agent-specific skin. In
addition, which of several toolkits to use could also be decided on an
element-by-element basis depending on the values of the <span
class="property">'background-color'</span>, <span
class="property">'background-image'</span>, <span
class="property">'border-*-style'</span>, and <span class="property"><a
href="#outline-style0">'outline-style'</a></span> properties, so that the
author styles could be honored while still honoring <span class="property"><a
href="#appearance0">'appearance'</a></span> even though the UA is unable to
influence the rendering of OS native UI controls.

<p class="note"><em><strong>Note.</strong> The exact list of properties set
by, influencing, and not affected by <span class="property"><a
href="#appearance0">'appearance'</a></span> given in the lists above may be
adjusted based on UA implementor feedback. </em>

<p>Appearance values take into account the user interface state (if any) of
the element; thus there is no need for separate values for enabled vs.
disabled checkboxes for example.

<div class="example">
<p style="display:none">Example(s):</p>

<h4 class="no-num no-toc" id="influencing">Influencing the color and
background-color of a button</h4>

<p>This example demonstrates setting the color and background-color of an
element that is set to '<code class="css">appearance:push-button</code>'.</p>

<h5 class="no-num no-toc" id="sample1">sample CSS:</h5>

<pre><code class="css">
input[type=button] {
  appearance:push-button; /* expected from UA defaults */
}

input[type=button].custom { 
  color: #393;
  background-color: #9cf; 
}
</code></pre>

<h5 class="no-num no-toc" id="sample2">sample (X)HTML fragment:</h5>

<pre><code>
&lt;input type="button" value="Plain button" /&gt; 
&lt;input type="button" value="With color" class="custom" /&gt;
</code></pre>

<h5 class="no-num no-toc" id="a-graphical">A graphical browser might render
these buttons as follows:</h5>

<p><object data="plainbutton.png" type="image/png"> First, a rounded button
with black text on a white background, with shades of gray being used near
the edges to give the impression of depth. </object> <object
data="colorbutton.png" type="image/png"> Second, a similar rounded button but
with blue text on a light blue background, and with shades of blue used to
give the impression of depth. </object></p>

<h5 class="no-num no-toc" id="your-browser">Your browser on your system:</h5>

<p><input type="button" value="Plain button"> <input
style="color:#339;background-color:#9cf" type="button" value="With color"></p>
</div>

<h3 id="system0"><span class="secno">5.3. </span>System fonts</h3>

<p>CSS2 introduced system font keywords as values for the shorthand <span
class="property"><a href="#font">'font'</a></span> property which have the
effect of setting all the elemental <span class="property">'font-*'</span>
properties. This specification adds the list of <a
href="#appearance-val">&lt;appearance&gt;</a> values to the set of system
fonts to allow styling text the same as such system controls.

<table class="propdef" id="namefont">
<tbody>
<tr>
<td><em>Name:</em>

<td><dfn id="font">font</dfn>

<tr>
<td><em>System values: </em>

<td> <a href="#appearance-val">&lt;appearance&gt;</a> | status-bar |
message-box | caption | small-caption | inherit

<tr>
<td><em>Initial:</em>

<td>see individual properties in CSS 2.1

<tr>
<td><em>Applies to:</em>

<td>all elements

<tr>
<td><em>Inherited:</em>

<td>yes

<tr>
<td><em>Percentages:</em>

<td>N/A for system values

<tr>
<td><em>Media:</em>

<td>visual

<tr>
<td><em>Computed value:</em>

<td> The computed values for system font keywords are simply the keywords
themselves.
</table>

<dl>
<dt><strong title="">icon</strong>

<dd>The font used to label icons.

<dt><strong>window</strong>

<dd>The font used in the content of a window.

<dt><strong>desktop</strong>

<dd>The font used on the desktop.

<dt><strong>workspace</strong>

<dd>The font used in a workspace window.

<dt><strong>document</strong>

<dd>The font used for the content of a document window.

<dt><strong>tooltip</strong>

<dd>The font used in a tooltip window.

<dt><strong>status-bar</strong>

<dd>The font used in window status bars.

<dt><strong>dialog</strong>

<dt><strong>message-box</strong>

<dd>The font used in dialog boxes.

<dt><strong>button</strong>

<dt><strong>caption</strong>

<dd>The font used for buttons (captioned controls etc.).

<dt><strong>small-caption</strong>

<dd>The font used for labeling small controls.

<dt><strong>push-button</strong>

<dd>The specific font used for push-buttons.

<dt><strong>hyperlink</strong>

<dd>The specific font used for hyperlinks.

<dt><strong>radio-button</strong>

<dd>The specific font used for radio-button labels.

<dt><strong>checkbox</strong>

<dd>The font used for checkbox button labels.

<dt><strong>menu-item</strong>

<dd>The font used for menu-item labels.

<dt><strong>tab</strong>

<dd>The font used for tab labels in a tabbed panel interface.

<dt><strong>menu</strong>

<dd>The font used in menus (e.g., dropdown menus and menu lists).

<dt><strong>menubar</strong>

<dd>The specific font used in a menubar.

<dt><strong>pull-down-menu</strong>

<dd>The specific font used in pull-down menus.

<dt><strong>pop-up-menu</strong>

<dd>The specific font used in popup menus.

<dt><strong>list-menu</strong>

<dd>The specific font used in menu lists.

<dt><strong>radio-group</strong>

<dd>The specific font used in radio button groups.

<dt><strong>checkbox-group</strong>

<dd>The specific font used in checkbox button groups.

<dt><strong>outline-tree</strong>

<dd>The specific font used in outline tree views.

<dt><strong>range</strong>

<dd>The specific font used in range controls.

<dt><strong>field</strong>

<dd>The specific font used in form text fields (input or output).

<dt><strong>combo-box</strong>

<dd>The specific font used in a combo-box field.

<dt><strong>signature</strong>

<dd>The specific font used in a signature field.

<dt><strong>password</strong>

<dd>The specific font used in a password field.
</dl>

<h2 id="element"><span class="secno">6. </span>Element icons</h2>

<p>This section is <em>normative</em>.

<h3 id="content0"><span class="secno">6.1. </span><span class="property"><a
href="#content">'content'</a></span> property addition</h3>

<table class="propdef" id="namecontent">
<tbody>
<tr>
<td><em>Name:</em>

<td><dfn id="content">content</dfn>

<tr>
<td><em>New&nbsp;Value(s):</em>

<td title="">icon

<tr>
<td><em>Initial:</em>

<td>same as CSS 2.1

<tr>
<td><em>Applies to:</em>

<td>same as CSS 2.1

<tr>
<td><em>Inherited:</em>

<td>same as CSS 2.1

<tr>
<td><em>Percentages:</em>

<td>same as CSS 2.1

<tr>
<td><em>Media:</em>

<td>same as CSS 2.1

<tr>
<td><em>Computed value:</em>

<td>the keyword '<span class="value" title="">icon</span>' if specified as
such, otherwise same as CSS 2.1
</table>

<dl>
<dt><strong title="">icon</strong>

<dd>The (pseudo-)element is replaced in its entirety by the resource
referenced by its <span class="property"><a href="#icon">'icon'</a></span>
property, and treated as a replaced element.
</dl>

<p class="note"><em><strong>Note.</strong> It is expected that the next draft
of the CSS3 Generated Content module <a href="#CSS3GENCON"
rel="biblioentry">[CSS3GENCON]</a> will include and superset this
functionality. </em>

<h3 id="icon-property"><span class="secno">6.2. </span><span
class="property"><a href="#icon">'icon'</a></span> property</h3>

<table class="propdef" id="nameicon">
<tbody>
<tr>
<td><em>Name:</em>

<td><dfn id="icon">icon</dfn>

<tr>
<td><em>Value:</em>

<td>auto | &lt;uri&gt; [, &lt;uri&gt;]* | inherit

<tr>
<td><em>Initial:</em>

<td>auto

<tr>
<td><em>Applies to:</em>

<td>all elements

<tr>
<td><em>Inherited:</em>

<td>no

<tr>
<td><em>Percentages:</em>

<td>N/A

<tr>
<td><em>Media:</em>

<td>all

<tr>
<td><em>Computed value:</em>

<td>The computed value for '<span class="value">auto</span>' is '<span
class="value">auto</span>'. The computed value for the &lt;uri&gt; value is
either the fully qualified URI value for the referenced icon that the UA is
able to render, or '<span class="value">auto</span>' if the UA did not find
any referenced icons that it could render.
</table>

<dl>
<dt><strong>auto</strong>

<dd>Use a default generic icon provided by the user agent.

<dt><strong>&lt;uri&gt;</strong>

<dd>URIs (see <a href="#URI" rel="biblioentry">[URI]</a>, <a href="#RFC1738"
rel="biblioentry">[RFC1738]</a> and <a href="#RFC1808"
rel="biblioentry">[RFC1808]</a>) provide a way of identifying resources. The
&lt;uri&gt; value(s) in this property refer to one or more icons in a comma
delimited list. The user agent loads the referenced icons one by one until it
finds one that it is able to render. This permits the usage of multiple
different icon formats for various platforms, and various media for that
matter.
</dl>

<p>The <span class="property"><a href="#icon">'icon'</a></span> property
provides the author the ability to style any arbitrary element with an iconic
equivalent. An element's icon is not used/rendered unless the <span
class="property"><a href="#content">'content'</a></span> property is set to
the value '<span class="value" title="">icon</span>' (see above). Documents
whose elements have icons assigned to them can be more easily viewed by users
who find too much text distracting.

<div class="example">
<p style="display:none">Example(s):</p>

<h4 class="no-num no-toc" id="representing">Representing elements with icons</h4>

<p>This example uses the above icon features to display icons in place of
images and objects.</p>

<pre><code class="css">
img,object { content:icon }
  /* note that the CSS3 Generated Content module <a href="#CSS3GENCON" rel="biblioentry">[CSS3GENCON]</a>
     expands the <span class="property"><a href="#content">'content'</a></span> property to apply to all elements. */
     
img { icon:url(imgicon.png); }
  /* provide a custom icon for images */
  
object { icon:url(objicon.png); }
  /* provide a different custom icon for objects */
</code></pre>
</div>

<h2 id="box-model"><span class="secno">7. </span>Box Model addition</h2>

<p>This section is <em>normative</em>.

<h3 id="box-sizing"><span class="secno">7.1. </span><span class="property"><a
href="#box-sizing0">'box-sizing'</a></span> property</h3>

<table class="propdef" id="namebox-sizing">
<tbody>
<tr>
<td><em>Name:</em>

<td><dfn id="box-sizing0">box-sizing</dfn>

<tr>
<td><em>Value:</em>

<td>content-box | border-box | inherit

<tr>
<td><em>Initial:</em>

<td>content-box

<tr>
<td><em>Applies to:</em>

<td>all elements that accept width or height

<tr>
<td><em>Inherited:</em>

<td>no

<tr>
<td><em>Percentages:</em>

<td>N/A

<tr>
<td><em>Media:</em>

<td>visual

<tr>
<td><em>Computed value:</em>

<td>specified value
</table>

<dl>
<dt><strong>content-box</strong>

<dd>This is the behavior of width and height as specified by CSS2.1. The
specified width and height (and respective min/max properties) apply to the
width and height respectively of the content box of the element. The padding
and border of the element are laid out and drawn outside the specified width
and height.

<dt><strong>border-box</strong>

<dd>The specified width and height (and respective min/max properties) on
this element determine the border box of the element. That is, any padding or
border specified on the element is laid out and drawn inside this specified
width and height. The content width and height are calculated by subtracting
the border and padding widths of the respective sides from the specified
<span class="property">'width'</span> and <span
class="property">'height'</span> properties. As the content width and height
<a href="http://www.w3.org/TR/CSS21/visudet.html#the-width-property">cannot
be negative</a> (<a href="#CSS21" rel="biblioentry">[CSS21]</a>, section
10.2), this computation is floored at 0.
<p class="note"><em><strong>Note.</strong> This is the behavior of width and
height as commonly implemented by legacy HTML user agents for replaced
elements and input elements.</em></p>
</dl>

<div class="example">
<p style="display:none">Example(s):</p>

<h4 class="no-num no-toc" id="using">Using box-sizing to evenly share space</h4>

<p>This example uses box-sizing to evenly horizontally split two divs with
fixed size borders inside a div container, which would otherwise require
additional markup.</p>

<h5 class="no-num no-toc" id="sample3">sample CSS:</h5>

<pre><code class="css">
div.container {
	width:38em;
	border:1em solid black;
}

div.split {
	box-sizing:border-box;
	width:50%;
	border:1em silver ridge;
	float:left;
}
</code></pre>

<h5 class="no-num no-toc" id="sample4">sample (X)HTML fragment:</h5>

<pre><code>
&lt;div class="container"&gt;
&lt;div class="split"&gt;This div occupies the left half.&lt;/div&gt;
&lt;div class="split"&gt;This div occupies the right half.&lt;/div&gt;
&lt;/div&gt;
</code></pre>

<h5 class="no-num no-toc" id="demonstration">demonstration of sample CSS and
(X)HTML:</h5>

<div style="width:38em; border:1em solid black">
<div style="box-sizing:border-box; width:50%; border:1em silver ridge;
float:left">This div should occupy the left half.</div>

<div style="box-sizing:border-box; width:50%; border:1em silver ridge;
float:left">This div should occupy the right half.</div>
The two divs above should appear side by side, each (including borders) 50%
of the content width of their container. If instead they are stacked one on
top of the other then your browser does not support <span class="property"><a
href="#box-sizing0">'box-sizing'</a></span>.</div>
</div>

<h2 id="outline1"><span class="secno">8. </span>Outline properties</h2>

<p>This section is <em>normative</em>.

<p>At times, style sheet authors may want to create outlines around visual
objects such as buttons, active form fields, image maps, etc., to make them
stand out. Outlines differ from borders in the following ways:

<ol>
<li>Outlines do not take up space.

<li>Outlines may be non-rectangular.
</ol>

<p>The outline properties control the style of these dynamic outlines.

<h3 id="outline"><span class="secno">8.1. </span><span class="property"><a
href="#outline0">'outline'</a></span> property</h3>

<table class="propdef" id="propdef-outline">
<tbody>
<tr>
<td><em>Name:</em>

<td><dfn id="outline0">outline</dfn>

<tr>
<td><em>Value:</em>

<td> [ <span class="property">&lt;'outline-color'&gt;</span> || <span
class="property">&lt;'outline-style'&gt;</span> || <span
class="property">&lt;'outline-width'&gt;</span> ] | inherit

<tr>
<td><em>Initial:</em>

<td>see individual properties

<tr>
<td><em>Applies to:</em>

<td>all elements

<tr>
<td><em>Inherited:</em>

<td>no

<tr>
<td><em>Percentages:</em>

<td>N/A

<tr>
<td><em>Media:</em>

<td>visual

<tr>
<td><em>Computed value:</em>

<td>undefined for shorthand properties
</table>

<h3 id="outline-width"><span class="secno">8.2. </span><span
class="property"><a href="#outline-width0">'outline-width'</a></span>
property</h3>

<table class="propdef" id="propdef-outline-width">
<tbody>
<tr>
<td><em>Name:</em>

<td><dfn id="outline-width0">outline-width</dfn>

<tr>
<td><em>Value:</em>

<td><a class="noxref"
href="http://www.w3.org/TR/CSS21/box.html#value-def-border-width"><span
class="value-inst-border-width">&lt;border-width&gt;</span></a> | inherit

<tr>
<td><em>Initial:</em>

<td>medium

<tr>
<td><em>Applies to:</em>

<td>all elements

<tr>
<td><em>Inherited:</em>

<td>no

<tr>
<td><em>Percentages:</em>

<td>N/A

<tr>
<td><em>Media:</em>

<td>visual

<tr>
<td><em>Computed value:</em>

<td>&lt;length&gt; value in absolute units (px or physical).
</table>

<h3 id="outline-style"><span class="secno">8.3. </span><span
class="property"><a href="#outline-style0">'outline-style'</a></span>
property</h3>

<table class="propdef" id="propdef-outline-style">
<tbody>
<tr>
<td><em>Name:</em>

<td><dfn id="outline-style0">outline-style</dfn>

<tr>
<td><em>Value:</em>

<td>auto | <a class="noxref"
href="http://www.w3.org/TR/CSS21/box.html#value-def-border-style"><span
class="value-inst-border-style">&lt;border-style&gt;</span></a> | inherit

<tr>
<td><em>Initial:</em>

<td>none

<tr>
<td><em>Applies to:</em>

<td>all elements

<tr>
<td><em>Inherited:</em>

<td>no

<tr>
<td><em>Percentages:</em>

<td>N/A

<tr>
<td><em>Media:</em>

<td>visual

<tr>
<td><em>Computed value:</em>

<td>specified value
</table>

<h3 id="outline-color"><span class="secno">8.4. </span><span
class="property"><a href="#outline-color0">'outline-color'</a></span>
property</h3>

<table class="propdef" id="propdef-outline-color">
<tbody>
<tr>
<td><em>Name:</em>

<td><dfn id="outline-color0">outline-color</dfn>

<tr>
<td><em>Value:</em>

<td><a class="noxref"
href="http://www.w3.org/TR/css3-color/#colorunits"><span
class="value-inst-color">&lt;color&gt;</span></a> | invert | inherit

<tr>
<td><em>Initial:</em>

<td>invert

<tr>
<td><em>Applies to:</em>

<td>all elements

<tr>
<td><em>Inherited:</em>

<td>no

<tr>
<td><em>Percentages:</em>

<td>N/A

<tr>
<td><em>Media:</em>

<td>visual

<tr>
<td><em>Computed value:</em>

<td>The computed value for '<span class="value"><a
href="#invert">invert</a></span>' is '<span class="value"><a
href="#invert">invert</a></span>'. For &lt;color&gt; values, the computed
value is as defined for the <a href="#CSS3COLOR"
rel="biblioentry">[CSS3COLOR]</a> <span class="property">'color'</span>
property.
</table>

<p>The outline created with the outline properties is drawn "over" a box,
i.e., the outline is always on top, and doesn't influence the position or
size of the box, or of any other boxes. Therefore, displaying or suppressing
outlines does not cause reflow.

<p>Outlines may be non-rectangular. For example, if the element is broken
across several lines, the outline should be an outline or minimum set of
outlines that encloses all the element's boxes. Each part of the outline
should be fully connected rather than open on some sides (as borders on
inline elements are when lines are broken). The parts of the outline are not
required to be rectangular. The position of the outline may be affected by
descendant boxes. User agents should use an algorithm for determining the
outline that encloses a region appropriate for conveying the concept of focus
to the user.

<p>The <span class="property"><a
href="#outline-width0">'outline-width'</a></span> property accepts the same
values as <a class="noxref"
href="http://www.w3.org/TR/CSS21/box.html#propdef-border-width"><span
class="propinst-border-width">'border-width'</span></a> (<a href="#CSS21"
rel="biblioentry">[CSS21]</a>, section 8.5.1).

<p>The <span class="property"><a
href="#outline-style0">'outline-style'</a></span> property accepts the same
values as <a class="noxref"
href="http://www.w3.org/TR/CSS21/box.html#propdef-border-style"><span
class="propinst-border-style">'border-style'</span></a> (<a href="#CSS21"
rel="biblioentry">[CSS21]</a>, section 8.5.3), except that '<span
class="value">hidden</span>' is not a legal outline style. In addition, in
CSS3, <span class="property"><a
href="#outline-style0">'outline-style'</a></span> accepts the value '<span
class="value">auto</span>'. The '<span class="value">auto</span>' value
permits the user agent to render a custom outline style, typically a style
which is either a user interface default for the platform, or perhaps a style
that is richer than can be described in detail in CSS, e.g. a rounded edge
outline with semi-translucent outer pixels that appears to glow. As such,
this specification does not define how the <span class="property"><a
href="#outline-color0">'outline-color'</a></span> is incorporated or used (if
at all) when rendering '<span class="value">auto</span>' style outlines. User
agents may treat '<span class="value">auto</span>' as '<span
class="value">solid</span>'.

<p>The <span class="property"><a
href="#outline-color0">'outline-color'</a></span> property accepts all
colors, as well as the keyword '<dfn id="invert">invert</dfn>'. 'Invert' is
expected to perform a color inversion on the pixels on the screen. This is a
common trick to ensure the focus border is visible, regardless of color
background.

<p> Conformant UAs may ignore the '<span class="value"><a
href="#invert">invert</a></span>' value on platforms that do not support
color inversion of the pixels on the screen. If the UA does not support the
'<span class="value"><a href="#invert">invert</a></span>' value then the
initial value of the <span class="property"><a
href="#outline-color0">'outline-color'</a></span> property is the '<span
class="value">currentColor</span>' <a href="#CSS3COLOR"
rel="biblioentry">[CSS3COLOR]</a> keyword.

<p>The <span class="property"><a href="#outline0">'outline'</a></span>
property is a shorthand property, and sets all three of <span
class="property"><a href="#outline-style0">'outline-style'</a></span>, <span
class="property"><a href="#outline-width0">'outline-width'</a></span>, and
<span class="property"><a href="#outline-color0">'outline-color'</a></span>.

<p class="note"><em><strong>Note.</strong> The outline is the same on all
sides. In contrast to borders, there are no 'outline-top' or 'outline-left'
etc. properties.</em>

<p> This specification does not define how multiple overlapping outlines are
drawn, or how outlines are drawn for boxes that are partially obscured behind
other elements.

<div class="example">
<p style="display:none">Example(s):

<p> Here's an example of drawing a thick outline around a BUTTON element:</p>

<pre><code class="css">
button { outline: thick solid }
</code></pre>
</div>

<p>Graphical user interfaces may use outlines around elements to tell the
user which element on the page has the focus. These outlines are in addition
to any borders, and switching outlines on and off should not cause the
document to reflow. The focus is the subject of user interaction in a
document (e.g., for entering text, selecting a button, etc.).

<div class="example">
<p style="display:none">Example(s):</p>

<p>For example, to draw a thick black line around an element when it has the
focus, and a thick red line when it is active, the following rules can be
used:</p>

<pre><code class="css">
:focus  { outline: thick solid black }
:active { outline: thick solid red }
</code></pre>
</div>

<div class="note">
<p> <em><strong>Note.</strong> Since the outline does not affect formatting
(i.e., no space is left for it in the box model), it may well overlap other
elements on the page. </em></p>
</div>

<h3 id="outline-offset"><span class="secno">8.5. </span><span
class="property"><a href="#outline-offset0">'outline-offset'</a></span>
property</h3>

<p>By default, the outline is drawn starting just outside the border edge.
However, it is possible to offset the outline and draw it beyond the border
edge.

<table class="propdef" id="propdef-outline-offset">
<tbody>
<tr>
<td><em>Name:</em>

<td><dfn id="outline-offset0">outline-offset</dfn>

<tr>
<td><em>Value:</em>

<td>&lt;length&gt; | inherit

<tr>
<td><em>Initial:</em>

<td>0

<tr>
<td><em>Applies to:</em>

<td>all elements

<tr>
<td><em>Inherited:</em>

<td>no

<tr>
<td><em>Percentages:</em>

<td>N/A

<tr>
<td><em>Media:</em>

<td>visual

<tr>
<td><em>Computed value:</em>

<td>&lt;length&gt; value in absolute units (px or physical).
</table>

<p>If the computed value of <span class="property"><a
href="#outline-offset0">'outline-offset'</a></span> is anything other than 0,
then the outline is outset from the border edge by that amount.

<div class="example">
<p style="display:none">Example(s):</p>

<p>For example, to leave 2 pixels of space between a focus outline and the
element that has the focus, or is active, the following rule can be used:</p>

<pre><code class="css">
:focus,:active  { outline-offset: 2px }
</code></pre>
</div>

<h2 id="resizing"><span class="secno">9. </span>Resizing</h2>

<p>This section is <em>normative</em>.

<p>CSS2.1 provides a mechanism for controlling the appearance of a scrolling
mechanism (e.g. scrollbars), and this specification adds to that a mechanism
for controlling user resizability of elements.

<h3 id="resize"><span class="secno">9.1. </span><span class="property"><a
href="#resize0">'resize'</a></span> property</h3>

<p>The <span class="property"><a href="#resize0">'resize'</a></span> property
allows the author to specify whether or not an element is resizable by the
user, and if so, along which axis/axes.

<table class="propdef" id="propdef-resize">
<tbody>
<tr>
<td><em>Name:</em>

<td><dfn id="resize0">resize</dfn>

<tr>
<td><em>Value: </em>

<td>none | both | horizontal | vertical | inherit

<tr>
<td><em>Initial:</em>

<td>none

<tr>
<td><em>Applies to:</em>

<td>elements with <span class="property">'overflow'</span> other than visible

<tr>
<td><em>Inherited:</em>

<td>no

<tr>
<td><em>Percentages:</em>

<td>N/A

<tr>
<td><em>Media:</em>

<td>visual

<tr>
<td><em>Computed value:</em>

<td>specified value.
</table>

<dl>
<dt><strong>none</strong>

<dd>The UA does not present a resizing mechanism on the element, and the user
is given no direct manipulation mechanism to resize the element.

<dt><strong>both</strong>

<dd>The UA presents a bidirectional resizing mechanism to allow the user to
adjust both the height and the width of the element.

<dt><strong>horizontal</strong>

<dd>The UA presents a unidirectional horizontal resizing mechanism to allow
the user to adjust only the width of the element.

<dt><strong>vertical</strong>

<dd>The UA presents a unidirectional vertical resizing mechanism to allow the
user to adjust only the height of the element.
</dl>

<p>Currently it is possible to control the appearance of the scrolling
mechanism (if any) on an element using the <span
class="property">'overflow'</span> property (e.g. '<code
class="css">overflow: scroll</code>' vs. '<code class="css">overflow:
hidden</code>' etc.). The purpose of the <span class="property"><a
href="#resize0">'resize'</a></span> property is to also allow control over
the appearance and function of the resizing mechanism (e.g. a resize box or
widget) on the element.

<p class="note"> <em><strong>Note.</strong> The resizing mechanism is NOT the
same as the scrolling mechanism. The scrolling mechanism allows the user to
determine which portion of the contents of an element is shown. The resizing
mechanism allows the user to determine the size of the element. </em>

<p>The <span class="property"><a href="#resize0">'resize'</a></span> property
applies to elements whose computed <span class="property">'overflow'</span>
value is something other than '<span class="value">visible</span>'. If <span
class="property">'overflow'</span> is different in a particular axis (i.e.
<span class="property">'overflow-x'</span> vs. <span
class="property">'overflow-y'</span>), then this property applies to the
dimension(s) which do not have the value '<span
class="value">visible</span>'.

<p> When an element is resized by the user, the user agent keeps track of a
resize factor (which is initially 1.0) for the width and height, which it
then applies to the computed width and height as part of determining the used
width and height. The element's contents (and surroundings) are reformatted
as necessary.

<p>The resize factor introduces a step in width/height calculations and
formatting as described in <a
href="http://www.w3.org/TR/CSS21/visudet.html">chapter 10 of CSS2.1</a>.
Specifically the following step is inserted between steps 1 and 2 of the
algorithm in <a
href="http://www.w3.org/TR/CSS21/visudet.html#min-max-widths">section
10.4</a> and <a
href="http://www.w3.org/TR/CSS21/visudet.html#min-max-heights">10.7</a> in
CSS2.1 <a href="#CSS21" rel="biblioentry">[CSS21]</a>, where [dimension] is
'width' for 10.4 and 'height' for 10.7.

<blockquote>
<p style="text-indent:-2em"> 1b. If the resize [dimension] factor is not 1.0,
then the tentative used [dimension] is multiplied by that factor, and the
rules above are applied again, but this time using the result of that
multiplication as the computed value for '[dimension]'.
</blockquote>

<p> With regard to interactivity and the Document Object Model (DOM), the
resize factor on an element lasts the lifetime of the element, however, if
the <span class="property"><a href="#resize0">'resize'</a></span> property
itself is altered (e.g. via pseudo-class change or via DOM manipulation),
then the resize factor is reset to 1.0.

<p> The precise direction of resizing (i.e. altering the top left of the
element or altering the bottom right) may depend on a number of factors
including whether the element is absolutely positioned, whether it is
positioned using the <span class="property">'right'</span> and <span
class="property">'bottom'</span> properties, whether the language of the
element is right-to-left etc. The precise direction of resizing is left to
the UA to properly determine for the platform.

<p> The user agent may restrict the resizing range to something suitable,
such as between the original formatted size of the element, and large enough
to encompass all the element's contents.

<div class="example">
<p style="display:none">Example(s):</p>

<p>For example, to make iframes scrollable <em>and</em> resizable, the
following rule can be used:</p>

<pre><code class="css">
iframe,object[type^="text/"],
object[type$="+xml"],object[type="application/xml"] 
{ 
  overflow:auto;
  resize:both;
}
</code></pre>
</div>
<!--
too bad we don't have @viewport yet. otherwise this would be cool:
<pre><code class="css">
@viewport {
       width: 100px; 
       height: 100px;
       overflow: hidden;
       resize: none 
     } /* display content in a non-resizable 100px by 100px window */
</code></pre>
-->

<h2 id="mouse"><span class="secno">10. </span>Mouse and Keyboard</h2>

<p>This section is <em>normative</em>.

<h3 id="cursor"><span class="secno">10.1. </span><span class="property"><a
href="#cursor0">'cursor'</a></span> property</h3>

<table class="propdef" id="propdef-cursor">
<tbody>
<tr>
<td><em>Name:</em>

<td><dfn id="cursor0">cursor</dfn>

<tr>
<td><em>Value:</em>

<td> [ [&lt;uri&gt; [&lt;x&gt; &lt;y&gt;]?,]* <br>
[ auto | default | none |<br>
context-menu | help | pointer | progress | wait | <br>
cell | crosshair | text | vertical-text | <br>
alias | copy | move | no-drop | not-allowed | <br>
e-resize | n-resize | ne-resize | nw-resize | s-resize | se-resize |
sw-resize | w-resize | ew-resize | ns-resize | nesw-resize | nwse-resize |
col-resize | row-resize | all-scroll <br>
] ] | inherit

<tr>
<td><em>Initial:</em>

<td>auto

<tr>
<td><em>Applies to:</em>

<td>all elements

<tr>
<td><em>Inherited:</em>

<td>yes

<tr>
<td><em>Percentages:</em>

<td>N/A

<tr>
<td><em>Media:</em>

<td>visual, interactive

<tr>
<td><em>Computed value:</em>

<td>If there are one or more &lt;uri&gt; values specified, and the UA finds a
&lt;uri&gt; that it is able to support (due to format, resource availability
etc.), then the computed value is that resolved absolute URI, fully
qualified, with optional &lt;x&gt; and &lt;y&gt; coordinates. If no such
supported &lt;uri&gt; value is found, or if no &lt;uri&gt; values were
specified, then the computed value is the specified keyword value.
</table>

<h4 class="no-num no-toc" id="value">Value descriptions</h4>

<h5 class="no-num no-toc" id="image">image cursors</h5>

<dl>
<dt><strong>&lt;uri&gt;</strong>

<dd>The user agent retrieves the cursor from the resource designated by the
URI. If the user agent cannot handle the first cursor of a list of cursors,
it must attempt to handle the second, etc. If the user agent cannot handle
any user-defined cursor, it must use the cursor keyword at the end of the
list. The optional &lt;x&gt; and &lt;y&gt; coordinates identify the exact
position within the image which is the pointer position (i.e., the hotspot).

<dt><strong>&lt;x&gt;</strong>

<dt><strong>&lt;y&gt;</strong>

<dd> Each is a &lt;number&gt;. The x-coordinate and y-coordinate of the
position in the cursor's coordinate system (left/top relative) which
represents the precise position that is being pointed to. If the values are
unspecified, then the intrinsic hotspot defined inside the image resource
itself is used. If both the values are unspecific and the referenced cursor
has no defined hotspot, the effect is as if a value of "0 0" were specified.
</dl>

<h5 class="no-num no-toc" id="general">general purpose cursors</h5>

<dl>
<dt style="cursor:auto"><strong>auto</strong>

<dd>The UA determines the cursor to display based on the current context.

<dt style="cursor:default"><strong>default</strong>

<dd>The platform-dependent default cursor. Often rendered as an arrow.

<dt style="cursor:none"><strong>none</strong>

<dd>No cursor is rendered for the element.
</dl>

<h5 class="no-num no-toc" id="links">links and status cursors</h5>

<dl>
<dt style="cursor:context-menu"><strong>context-menu</strong>

<dd>A context menu is available for the object under the cursor. Often
rendered as an arrow with a small menu-like graphic next to it.

<dt style="cursor:help"><strong>help</strong>

<dd>Help is available for the object under the cursor. Often rendered as a
question mark or a balloon.

<dt style="cursor:pointer"><strong>pointer</strong>

<dd>The cursor is a pointer that indicates a link.

<dt style="cursor:progress"><strong>progress</strong>

<dd>A progress indicator. The program is performing some processing, but is
different from '<span class="value">wait</span>' in that the user may still
interact with the program. Often rendered as a spinning beach ball, or an
arrow with a watch or hourglass.

<dt style="cursor:wait"><strong>wait</strong>

<dd>Indicates that the program is busy and the user should wait. Often
rendered as a watch or hourglass.
</dl>

<h5 class="no-num no-toc" id="selection">selection cursors</h5>

<dl>
<dt style="cursor:cell"><strong>cell</strong>

<dd>Indicates that a cell or set of cells may be selected. Often rendered as
a thick plus-sign with a dot in the middle.

<dt style="cursor:crosshair"><strong>crosshair</strong>

<dd>A simple crosshair (e.g., short line segments resembling a "+" sign).
Often used to indicate a two dimensional bitmap selection mode.

<dt style="cursor:text"><strong>text</strong>

<dd>Indicates text that may be selected. Often rendered as a vertical I-beam.
User agents may automatically display a horizontal I-beam/cursor (e.g. same
as the '<span class="value">vertical-text</span>' keyword) for vertical text,
or for that matter, any angle of I-beam/cursor for text that is rendered at
any particular angle.

<dt style="cursor:vertical-text"><strong>vertical-text</strong>

<dd>Indicates vertical-text that may be selected. Often rendered as a
horizontal I-beam.
</dl>

<h5 class="no-num no-toc" id="drag-and">drag and drop cursors</h5>

<dl>
<dt style="cursor:alias"><strong>alias</strong>

<dd>Indicates an alias of/shortcut to something is to be created. Often
rendered as an arrow with a small curved arrow next to it.

<dt style="cursor:copy"><strong>copy</strong>

<dd>Indicates something is to be copied. Often rendered as an arrow with a
small plus sign next to it.

<dt style="cursor:move"><strong>move</strong>

<dd>Indicates something is to be moved.

<dt style="cursor:no-drop"><strong>no-drop</strong>

<dd> Indicates that the dragged item cannot be dropped at the current cursor
location. Often rendered as a hand or pointer with a small circle with a line
through it.

<dt style="cursor:not-allowed"><strong>not-allowed</strong>

<dd>Indicates that the requested action will not be carried out. Often
rendered as a circle with a line through it.
</dl>

<h5 class="no-num no-toc" id="resizing0">resizing and scrolling cursors</h5>

<dl>
<dt><strong> <span style="cursor:e-resize">e-resize</span>, <span
style="cursor:n-resize">n-resize</span>, <span
style="cursor:ne-resize">ne-resize</span>, <span
style="cursor:nw-resize">nw-resize</span>, <span
style="cursor:s-resize">s-resize</span>, <span
style="cursor:se-resize">se-resize</span>, <span
style="cursor:sw-resize">sw-resize</span>, <span
style="cursor:w-resize">w-resize</span> </strong>

<dd>Indicates that some edge is to be moved. For example, the 'se-resize'
cursor is used when the movement starts from the south-east corner of the
box.

<dt><strong> <span style="cursor:ew-resize">ew-resize</span>, <span
style="cursor:ns-resize">ns-resize</span>, <span
style="cursor:nesw-resize">nesw-resize</span>, <span
style="cursor:nwse-resize">nwse-resize</span> </strong>

<dd>Indicates a bidirectional resize cursor.

<dt style="cursor:col-resize"><strong>col-resize</strong>

<dd>Indicates that the item/column can be resized horizontally. Often
rendered as arrows pointing left and right with a vertical bar separating
them.

<dt style="cursor:row-resize"><strong>row-resize</strong>

<dd>Indicates that the item/row can be resized vertically. Often rendered as
arrows pointing up and down with a horizontal bar separating them.

<dt style="cursor:all-scroll"><strong>all-scroll</strong>

<dd>Indicates that the something can be scrolled in any direction. Often
rendered as arrows pointing up, down, left, and right with a dot in the
middle.
</dl>

<p>The UA may treat unsupported values as '<span class="value">auto</span>'.
E.g. on platforms that do not have a concept of a '<span
class="value">context-menu</span>' cursor, the UA may render '<span
class="value">default</span>' or whatever is appropriate.

<div class="example">
<h4 class="no-num no-toc" id="example">Example: cursor fallback</h4>

<p>Here is an example of using several cursor values.</p>

<pre><code class="css">
:link,:visited { 
    cursor: url(example.svg#linkcursor), 
            url(hyper.cur),
            url(hyper.png) 2 3, 
            pointer 
}
</code></pre>

<p>This example sets the cursor on all hyperlinks (whether visited or not) to
an external <a
href="http://www.w3.org/TR/SVG/interact.html#CursorElement">SVG cursor</a>
(<a href="#SVG10" rel="biblioentry">[SVG10]</a>, section 16.8.3). User agents
that don't support SVG cursors would simply skip to the next value and
attempt to use the "hyper.cur" cursor. If that cursor format was also not
supported, the UA could attempt to use the "hyper.png" cursor with the
explicit hot spot. Finally if the UA does not support any of those image
cursor formats, the UA would skip to the last value and simply render the
'<span class="value">pointer</span>' cursor.</p>
</div>

<h3 id="keyboard"><span class="secno">10.2. </span>Keyboard control</h3>

<h4 id="nav-index"><span class="secno">10.2.1. </span>Sequential navigation
order: the <span class="property"><a
href="#nav-index0">'nav-index'</a></span> property</h4>

<p>The <span class="property"><a href="#nav-index0">'nav-index'</a></span>
property is an input-method-neutral way of specifying the sequential
navigation order (also known as "tabbing order").

<table class="propdef" id="propdef-nav-index">
<tbody>
<tr>
<td><em>Name:</em>

<td><dfn id="nav-index0">nav-index</dfn>

<tr>
<td><em>Value: </em>

<td>auto | &lt;number&gt; | inherit

<tr>
<td><em>Initial:</em>

<td>auto

<tr>
<td><em>Applies to:</em>

<td>all enabled elements

<tr>
<td><em>Inherited:</em>

<td>no

<tr>
<td><em>Percentages:</em>

<td>n/a

<tr>
<td><em>Media:</em>

<td>interactive

<tr>
<td><em>Computed value:</em>

<td>specified value.
</table>

<dl>
<dt>auto

<dd>The element's sequential navigation order is assigned automatically by
the user agent.

<dt>&lt;number&gt;

<dd>The number (which is non-zero and positive) indicates the sequential
navigation order for the element. '<span class="value">1</span>' means first.
Elements with the same nav-index value are navigated in document order when
that nav-index value is being navigated.
</dl>

<p>This property is a replacement for the HTML4/XHTML1 attribute '<a
href="http://www.w3.org/TR/html401/interact/forms.html#h-17.11.1">tabindex</a>'
(<a href="#HTML401" rel="biblioentry">[HTML401]</a>, section 17.11.1).
Borrowed and slightly rephrased from the HTML4 Recommendation:

<p> This property specifies the position of the current element in the
sequential navigation order for the current document.

<p> The sequential navigation order defines the order in which elements will
receive focus when navigated by the user via the keyboard. The sequential
navigation order may include elements nested within other elements.

<p> Elements that may receive focus should be navigated by user agents
according to the following rules:

<ol>
<li>Those elements that support the nav-index property and assign a positive
value to it are navigated first. Navigation proceeds from the element with
the lowest nav-index value to the element with the highest value. Values need
not be sequential nor must they begin with any particular value. Elements
that have identical nav-index values should be navigated in the order they
appear in the character stream.

<li>Those elements that do not support the nav-index property or support it
and assign it a value of '<span class="value">auto</span>' are navigated
next. These elements are navigated in the order they appear in the character
stream.

<li>Elements that are disabled do not participate in the sequential
navigation order.
</ol>

<p> The actual key sequence that causes sequential navigation or element
activation depends on the configuration of the user agent (e.g., the "tab"
key is often used for sequential navigation, and the "enter" key is used to
activate a selected element).

<p> User agents may also define key sequences to navigate the sequential
navigation order in reverse. When the end (or beginning) of the tabbing order
is reached, user agents may circle back to the beginning (or end). The key
combination "shift-tab" is often used for reverse sequential navigation.

<h4 id="nav-dir"><span class="secno">10.2.2. </span>Directional focus
navigation: the <span class="property"><a href="#nav-up">'nav-up'</a></span>,
<span class="property"><a href="#nav-right">'nav-right'</a></span>, <span
class="property"><a href="#nav-down">'nav-down'</a></span>, <span
class="property"><a href="#nav-left">'nav-left'</a></span> properties</h4>

<table class="propdef" id="names">
<tbody>
<tr>
<td><em>Names: </em>

<td><dfn id="nav-up">nav-up</dfn>, <dfn id="nav-right">nav-right</dfn>, <dfn
id="nav-down">nav-down</dfn>, <dfn id="nav-left">nav-left</dfn>

<tr>
<td><em>Value: </em>

<td>auto | &lt;id&gt; [ current | root | &lt;target-name&gt; ]? | inherit

<tr>
<td><em>Initial:</em>

<td>auto

<tr>
<td><em>Applies to:</em>

<td>all enabled elements

<tr>
<td><em>Inherited:</em>

<td>no

<tr>
<td><em>Percentages:</em>

<td>N/A

<tr>
<td><em>Media:</em>

<td>interactive

<tr>
<td><em>Computed value:</em>

<td>&lt;id&gt; as specified with &lt;target-name&gt; string or keyword.
</table>

<dl>
<dt>auto

<dd>The user agent automatically determines which element to navigate the
focus to in response to directional navigational input.

<dt>&lt;id&gt;

<dd>
<p>The &lt;id&gt; value consists of a '<code>#</code>' character followed by
an identifier, similar to a fragment identifier in a URL. It indicates the
element to which the focus is navigated to in response to directional
navigation input respective to the specific property.</p>

<p> If the &lt;id&gt; refers to the currently focused element, the
directional navigation input respective to the nav- property is ignored
&mdash; there is no need to refocus the same element.</p>

<dt>&lt;target-name&gt;

<dd> The &lt;target-name&gt; parameter indicates the target frame for the
focus navigation. It is a string and it cannot start with the underscore "_"
character. If the specified target frame does not exist, the parameter will
be treated as the keyword '<span class="value">current</span>', which means
to simply use the frame that the element is in. The keyword '<span
class="value">root</span>' indicates that the user agent should target the
full window.
</dl>

<p>User agents for devices with directional navigation keys respond by
navigating the focus according to four respective nav-* directional
navigation properties (nav-up, nav-right, nav-down, nav-left). This
specification does not define which keys of a device are directional
navigational keys.

<div class="note">
<p> <em><strong>Note.</strong> Typical personal computers have keyboards with
four arrow keys. One possible implementation would be to use those four arrow
keys for directional navigation. For accessibility and user convenience, user
agents should allow configuration of which keys on a keyboard are used for
directional navigation. </em></p>
</div>

<div class="example">
<h4 class="no-num no-toc" id="example0">Example: positioned buttons</h4>

<p>Here is an example of buttons positioned in a diamond shape whose
navigation order and directional focus navigation is set in such a way to
navigate the focus clockwise (or counter-clockwise) around the diamond shape
when the user chooses to navigate sequentially or directionally.</p>

<pre><code class="css">
button { position:absolute }

button#b1 {
	top:0; left:50%;
	nav-index:1;
	nav-right:#b2; nav-left:#b4;
	nav-down:#b2; nav-up:#b4;
}

button#b2 {
	top:50%; left:100%;
	nav-index:2;
	nav-right:#b3; nav-left:#b1;
	nav-down:#b3; nav-up:#b1;
}

button#b3 {
	top:100%; left:50%;
	nav-index:3;
	nav-right:#b4; nav-left:#b2;
	nav-down:#b4; nav-up:#b2;
}
	
button#b4 {
	top:50%; left:0;
	nav-index:4;
	nav-right:#b1; nav-left:#b3;
	nav-down:#b1; nav-up:#b3;
}
</code></pre>

<p>Whatever markup sequence the buttons may have (which is not specified in
this example) is irrelevant in this case because they are positioned, and
yet, it is still important to ensure focus navigation behaviors which relate
reasonably to the specified layout.</p>
</div>

<hr title="Separator from footer">

<h2 class="no-num" id="acknowledgments">Appendix A. Acknowledgments</h2>

<p>This appendix is <em>informative</em>.

<p>Thanks to feedback and contributions from L. David Baron, Bert Bos,
Matthew Brealey, Ada Chan, Michael Day, Micah Dubinko, Elika E., Steve
Falkenburg, Al Gilman, Ian Hickson, Bjoern Hoehrmann, David Hyatt, Richard
Ishida, Sho Kuwamoto, Susan Lesch, Peter Linss, Brad Pettit, Alexander
Savenkov, Sebastian Schnitzenbaumer, Etan Wexler, David Woolley and Domel.

<h2 class="no-num" id="references">Appendix B. Bibiliography</h2>

<p>This appendix is <em>normative</em>.

<h3 class="no-num no-toc" id="normative">Normative References</h3>
<!--begin-normative-->
<!-- Sorted by label -->

<dl class="bibliography">
<dt style="display: none"><!-- keeps the doc valid if the DL is empty -->
<!---->

<dt id="CSS21">[CSS21]

<dd>Bert Bos; et al. <cite>Cascading Style Sheets, level 2 revision 1.</cite>
25 February 2004. W3C Candidate Recommendation. (Work in progress.) URL: <a
href="http://www.w3.org/TR/2004/CR-CSS21-20040225">http://www.w3.org/TR/2004/CR-CSS21-20040225</a>
<!---->

<dt id="CSS3COLOR">[CSS3COLOR]

<dd>Tantek &#199;elik; Chris Lilley. <cite>CSS3 Color Module.</cite> 14 May
2003. W3C Candidate Recommendation. (Work in progress.) URL: <a
href="http://www.w3.org/TR/2003/CR-css3-color-20030514">http://www.w3.org/TR/2003/CR-css3-color-20030514</a>
<!---->

<dt id="RFC1738">[RFC1738]

<dd>T. Berners-Lee; L. Masinter; M. McCahill. <cite>Uniform Resource Locators
(URL).</cite> December 1994. Internet RFC 1738. URL: <a
href="http://www.ietf.org/rfc/rfc1738.txt">http://www.ietf.org/rfc/rfc1738.txt</a>
<!---->

<dt id="RFC1808">[RFC1808]

<dd>R. Fielding. <cite>Relative Uniform Resource Locators.</cite> June 1995.
Internet RFC 1808. URL: <a
href="http://www.ietf.org/rfc/rfc1808.txt">http://www.ietf.org/rfc/rfc1808.txt</a>
<!---->

<dt id="RFC2119">[RFC2119]

<dd>S. Bradner. <cite>Key words for use in RFCs to Indicate Requirement
Levels.</cite> Internet RFC 2119. URL: <a
href="http://www.ietf.org/rfc/rfc2119.txt">http://www.ietf.org/rfc/rfc2119.txt</a>
<!---->

<dt id="SELECT">[SELECT]

<dd>Daniel Glazman; et al. <cite>Selectors.</cite> 13 November 2001. W3C
Candidate Recommendation. (Work in progress.) URL: <a
href="http://www.w3.org/TR/2001/CR-css3-selectors-20011113">http://www.w3.org/TR/2001/CR-css3-selectors-20011113</a>
<!---->

<dt id="URI">[URI]

<dd>T. Berners-Lee; R. Fielding; L. Masinter. <cite>Uniform Resource
Identifiers (URI): generic syntax.</cite> August 1998. Internet RFC 2396.
URL: <a
href="http://www.isi.edu/in-notes/rfc2396.txt">http://www.isi.edu/in-notes/rfc2396.txt</a>
<!---->
</dl>
<!--end-normative-->

<h3 class="no-num no-toc" id="informative-references">Informative References</h3>
<!--begin-informative-->
<!-- Sorted by label -->

<dl class="bibliography">
<dt style="display: none"><!-- keeps the doc valid if the DL is empty -->
<!---->

<dt id="CSS1">[CSS1]

<dd>H&#229;kon Wium Lie; Bert Bos. <cite>Cascading Style Sheets (CSS1) Level
1 Specification.</cite> 17 December 1996. W3C Recommendation. Revised 11
January 1999. URL: <a
href="http://www.w3.org/TR/1999/REC-CSS1-19990111">http://www.w3.org/TR/1999/REC-CSS1-19990111</a>
<!---->

<dt id="CSS2">[CSS2]

<dd>Bert Bos; et al. <cite>Cascading Style Sheets, level 2 (CSS2)
Specification.</cite> 12 May 1998. W3C Recommendation. URL: <a
href="http://www.w3.org/TR/1998/REC-CSS2-19980512">http://www.w3.org/TR/1998/REC-CSS2-19980512</a>
<!---->

<dt id="CSS3GENCON">[CSS3GENCON]

<dd>Ian Hickson. <cite>CSS3 Generated and Replaced Content Module.</cite> 14
May 2003. W3C Working Draft. (Work in progress.) URL: <a
href="http://www.w3.org/TR/2003/WD-css3-content-20030514">http://www.w3.org/TR/2003/WD-css3-content-20030514</a>
<!---->

<dt id="CSSUI">[CSSUI]

<dd>Tantek &#199;elik. <cite>User Interface for CSS3.</cite> 2 August 2002.
W3C Working Draft. (Work in progress.) URL: <a
href="http://www.w3.org/TR/2002/WD-css3-userint-20020802">http://www.w3.org/TR/2002/WD-css3-userint-20020802</a>
<!---->

<dt id="HTML401">[HTML401]

<dd>David Raggett; Arnaud Le Hors; Ian Jacobs. <cite>HTML 4.01
Specification.</cite> 24 December 1999. W3C Recommendation. URL: <a
href="http://www.w3.org/TR/1999/REC-html401-19991224">http://www.w3.org/TR/1999/REC-html401-19991224</a>
<!---->

<dt id="SVG10">[SVG10]

<dd>Jon Ferraiolo (ed). <cite>Scalable Vector Graphics (SVG) 1.0
Specification.</cite> 4 September 2001. W3C Recommendation. URL: <a
href="http://www.w3.org/TR/2001/REC-SVG-20010904">http://www.w3.org/TR/2001/REC-SVG-20010904</a>
<!---->

<dt id="SVG11">[SVG11]

<dd>Jon Ferraiolo; &#34276;&#27810; &#28147; (FUJISAWA Jun); Dean Jackson
(eds). <cite>Scalable Vector Graphics (SVG) 1.1 Specification.</cite> 14
January 2003. W3C Recommendation. URL: <a
href="http://www.w3.org/TR/2003/REC-SVG11-20030114">http://www.w3.org/TR/2003/REC-SVG11-20030114</a>
<!---->

<dt id="UAAG10">[UAAG10]

<dd>Ian Jacobs; Jon Gunderson; Eric Hansen. <cite>User Agent Accessibility
Guidelines 1.0.</cite> 17 December 2002. W3C Recommendation. URL: <a
href="http://www.w3.org/TR/2002/REC-UAAG10-20021217">http://www.w3.org/TR/2002/REC-UAAG10-20021217</a>
<!---->

<dt id="XFORMS10">[XFORMS10]

<dd>Micah Dubinko; et al. <cite>XForms 1.0.</cite> 14 October 2003. W3C
Recommendation. URL: <a
href="http://www.w3.org/TR/2003/REC-xforms-20031014">http://www.w3.org/TR/2003/REC-xforms-20031014</a>
<!---->

<dt id="XHTML10">[XHTML10]

<dd>Steven Pemberton; et al. <cite>XHTML&#8482; 1.0 The Extensible HyperText
Markup Language (Second Edition).</cite> 26 January 2000. W3C Recommendation.
Revised on 1 August 2002 URL: <a
href="http://www.w3.org/TR/2002/REC-xhtml1-20020801">http://www.w3.org/TR/2002/REC-xhtml1-20020801</a>
<!---->

<dt id="XHTML11">[XHTML11]

<dd>Murray Altheim; Shane McCarron. <cite>XHTML&#8482; 1.1 - Module-based
XHTML.</cite> 31 May 2001. W3C Recommendation. URL: <a
href="http://www.w3.org/TR/2001/REC-xhtml11-20010531">http://www.w3.org/TR/2001/REC-xhtml11-20010531</a>
<!---->

<dt id="XML10">[XML10]

<dd>Tim Bray; et al. <cite>Extensible Markup Language (XML) 1.0 (Third
Edition).</cite> 4 February 2004. W3C Recommendation. URL: <a
href="http://www.w3.org/TR/2004/REC-xml-20040204">http://www.w3.org/TR/2004/REC-xml-20040204</a>
<!---->
</dl>
<!--end-informative-->

<h2 class="no-num" id="changes">Appendix C. Changes</h2>

<p>This appendix is <em>informative</em>.

<p>In general this draft contains numerous editorial/grammatical/spelling
corrections, and several new informative examples. This appendix describes
minor functional changes from the <a
href="http://www.w3.org/TR/2003/WD-css3-ui-20030703">Last Call Working Draft
of 3 July 2003</a> that were made to accommodate <a
href="/Style/css3-updates/css3-ui-comments">last call comments.</a>

<ul>
<li>:active pseudo-class. Clarified that <a href="#active">:active</a> only
applies to the left mouse button on multibutton mice.

<li>:default pseudo-class. Clarified that multiple :default elements are
possible, e.g. multiple default options for a select-many.

<li>:in-range and :out-of-range pseudo-classes. Added sentence: "An element
that lacks data range limits or is not a form control is neither :in-range
nor :out-of-range."

<li><span class="property"><a href="#appearance0">'appearance'</a></span> and
<span class="property"><a href="#font">'font'</a></span> properties. Added
user interface elements '<span class="value">menu-item</span>' and '<span
class="value">tab</span>' in the '<span class="value">button</span>' group,
'<span class="value">range</span>' to '<span class="value">menu</span>'
group, and, '<span class="value">signature</span>', '<span
class="value">password</span>' and '<span class="value">combo-box</span>' to
the '<span class="value">field</span>' group. Better specified <span
class="property"><a href="#appearance0">'appearance'</a></span> property
details.

<li>Icon functionality (and '<span class="value" title="">icon</span>' value)
moved from <span class="property">'display'</span> property to <span
class="property"><a href="#content">'content'</a></span> property.

<li><span class="property">'key-equivalent'</span> property removed.

<li><span class="property"><a href="#cursor0">'cursor'</a></span> property.
Added '<span class="value">none</span>' keyword.

<li><span class="property"><a href="#resize0">'resize'</a></span> property.
Changed media group to 'visual' to match <span
class="property">'overflow'</span>. Removed '<span class="value">auto</span>'
value. Changed initial value to '<span class="value">none</span>' to match
current implementation defaults.

<li><span class="property"><a
href="#outline-style0">'outline-style'</a></span> property. Added '<span
class="value">auto</span>' keyword.

<li>directional navigation properties. Changed &lt;uri&gt; in value
description to &lt;id&gt;. Added target keyword '<span
class="value">current</span>' in addition to '<span
class="value">root</span>'.
</ul>

<h2 class="no-num" id="appendix">Appendix D. Default style sheet additions
for HTML4/XHTML1</h2>

<p>This appendix is <em>informative</em>.

<p>Potential additions to the base style sheet to express HTML4/XHTML1 form
controls and a few HTML4/XHTML1 dynamic presentation attributes:

<pre class="html4ss">

:link,:visited { 
 appearance: hyperlink; /* set color, font, background, padding, border, etc.*/
}

:enabled:focus {
 outline: 2px inset;
}

button,
input[type=button],
input[type=reset],
input[type=submit],
input[type=checkbox],
input[type=radio],
textarea,
input,
input[type=text],
input[type=hidden],
input[type=password],
input[type=image]
{
 appearance: button;
 display: inline-block;
 white-space: nowrap;
}

button,
input[type=button],
input[type=reset][value],
input[type=submit][value]
{
/* appearance of HTML4/XHTML1 push buttons */
 appearance: push-button;
}

button
{
/* white space handling of BUTTON tags in particular */
 white-space:normal;
}

input[type=reset]
{
/* default content of HTML4/XHTML1 input type=reset button */
 content: "Reset";
}

input[type=submit]
{
/* default content of HTML4/XHTML1 input type=submit button */
 content: "Submit";
}

input[type=button],
input[type=reset][value],
input[type=submit][value]
{
/* text content/labels of HTML4/XHTML1 "input" buttons */
 content: attr(value);
}

input[type=checkbox]
{
 appearance:checkbox;
}

input[type=radio]
{
 appearance:radio-button;
}

textarea,
input,
input[type=text],
input[type=hidden],
input[type=password]
{
 appearance: field;
}

textarea
{
/* white space handling of TEXTAREA tags in particular */
 white-space:pre-wrap;
}

input[type=password]
{
 appearance: password;
}

input[type=hidden] 
{
/* appearance of the HTML4/XHTML1 hidden text field in particular */
 display: none;
}

input[type=image]
{
 display: inline-block;
 content: attr(src,url);
 border: none;
}

select[size]
{
/* HTML4/XHTML1 &lt;select&gt; w/ size more than 1 - appearance of list */
 appearance: list-menu;
 display: inline-block;
 height: attr(size,em);
}

select,select[size=1]
{
/* HTML4/XHTML1 &lt;select&gt; without size, or size=1 - popup-menu */
 appearance: popup-menu;
 display: inline-block;
 height: 1em;
 overflow: hidden;
}

option
{
 appearance:menu-item;
}

select[size]:active
{
/* active HTML4/XHTML &lt;select&gt; w/ size more than 1 - appearance of active list */
 display: inline-block;
}

optgroup,option
{
 display: block;
 white-space: nowrap;
}

optgroup[label],option[label] 
{
 content: attr(label);
}

option[selected]::before 
{ 
 display: inline;
 content: check; 
}

*[tabindex] { nav-index:attr(tabindex,number) }


/* Though FRAME resizing is not directly addressed by this specification,
   the following rules may provide an approximation of reasonable behavior. */

/*

frame { resize:both }
frame[noresize] { resize:none }

*/

</pre>

<h2 class="no-num" id="appendix0">Appendix E. Example profiles</h2>

<p>This appendix is <em>informative</em>.

<p>These example profiles are written to roughly reflect the set of
functionality that other specifications use/define which has been explicitly
defined and/or updated in this specification. These profiles are independent
of any other dimensions of variability, e.g. properties that may allow some
values to be treated as other values.

<p> This specification recommends that implementations base their support on
at least one of the profiles defined below. Thus a CSS2.1 user agent for
example, should consider supporting the CSS2.1 profile for CSS3 Basic UI.

<h3 class="no-num no-toc" id="css1-profile">CSS1 profile for CSS3 Basic UI</h3>

<table border="1" class="tprofile" width="75%">
<tbody>
<tr>
<th class="title" colspan="2"><span class="modulename">CSS3 Basic User
Interface</span> profile

<tr>
<th>Specification

<td>CSS level 1

<tr>
<th>Accepts

<td> :active pseudo-class on hyperlinks

<tr>
<th>Excludes

<td> :hover, :active on non-hyperlinks, :focus, :enabled, :disabled,
:checked, :indeterminate pseudo-classes<br>
:default, :valid, :invalid, :in-range, :out-of-range, :required, :optional,
:read-only, :read-write pseudo-classes<br>
::selection, ::value, ::choices, ::repeat-item, ::repeat-index
pseudo-elements<br>
'appearance' property<br>
'font' property keyword additions<br>
'icon' keyword value for 'content' property<br>
'box-sizing' property<br>
'outline', 'outline-width', 'outline-style', 'outline-color',
'outline-offset' properties<br>
'resize' property<br>
'cursor' property<br>
'nav-index', 'nav-up', 'nav-right', 'nav-down', 'nav-left' properties

<tr>
<th>Extra constraints

<td>none.
</table>

<h3 class="no-num no-toc" id="css2.1">CSS2.1 profile for CSS3 Basic UI</h3>

<table border="1" class="tprofile" width="75%">
<tbody>
<tr>
<th class="title" colspan="2"><span class="modulename">CSS3 Basic User
Interface</span> profile

<tr>
<th>Specification

<td>CSS level 2 revision 1

<tr>
<th>Accepts

<td> :hover, :active, :focus pseudo-classes<br>
'font' property keyword values: 'caption', 'icon', 'menu', 'message-box',
'small-caption', 'status-bar'.<br>
'outline', 'outline-width', 'outline-style', 'outline-color' properties.<br>
'cursor' property<br>

<tr>
<th>Excludes

<td> :enabled, :disabled, :checked, :indeterminate pseudo-classes<br>
:default, :valid, :invalid, :in-range, :out-of-range, :required, :optional,
:read-only, :read-write pseudo-classes<br>
::selection, ::value, ::choices, ::repeat-item, ::repeat-index
pseudo-elements<br>
'appearance' property<br>
'font' property keyword additions<br>
'icon' keyword value for 'content' property<br>
'box-sizing' property<br>
'outline-offset' property<br>
'resize' property<br>
'cursor' property additions<br>
'nav-index', 'nav-up', 'nav-right', 'nav-down', 'nav-left' properties

<tr>
<th>Extra constraints

<td>'cursor' property support omits hotspot for downloaded cursors, and new
cursor keyword values. 'outline-style' property does not support 'auto'
value.
</table>

<h3 class="no-num no-toc" id="xforms">XForms profile for CSS3 Basic UI</h3>

<table border="1" class="tprofile" width="75%">
<tbody>
<tr>
<th class="title" colspan="2"><span class="modulename">CSS3 Basic User
Interface</span> profile

<tr>
<th>Specification

<td>XForms 1.0

<tr>
<th>Accepts

<td> :hover, :active, :focus, :enabled, :disabled, :checked, :indeterminate
pseudo-classes<br>
:default, :valid, :invalid, :in-range, :out-of-range, :required, :optional,
:read-only, :read-write pseudo-classes<br>
::value, ::choices, ::repeat-item, ::repeat-index pseudo-elements

<tr>
<th>Excludes

<td> ::selection pseudo-element<br>
'appearance' property<br>
'outline', 'outline-width', 'outline-style', 'outline-color' properties.<br>
'cursor' property<br>
'font' property keyword additions<br>
'icon' keyword value for 'content' property<br>
'box-sizing' property<br>
'outline-offset' property<br>
'resize' property<br>
'cursor' property additions<br>
'nav-index', 'nav-up', 'nav-right', 'nav-down', 'nav-left' properties

<tr>
<th>Extra constraints

<td>none.
</table>

<h3 class="no-num no-toc" id="full-profile">Full profile for CSS3 Basic UI</h3>

<table border="1" class="tprofile" width="75%">
<tbody>
<tr>
<th class="title" colspan="2"><span class="modulename">CSS3 Basic User
Interface</span> profile

<tr>
<th>Specification

<td>CSS3

<tr>
<th>Accepts

<td> :hover, :active, :focus, :enabled, :disabled, :checked, :indeterminate
pseudo-classes<br>
:default, :valid, :invalid, :in-range, :out-of-range, :required, :optional,
:read-only, :read-write pseudo-classes<br>
::selection, ::value, ::choices, ::repeat-item, ::repeat-index
pseudo-elements<br>
'appearance' property<br>
'outline', 'outline-width', 'outline-style', 'outline-color' properties.<br>
'cursor' property<br>
'font' property keyword additions<br>
'icon' keyword value for 'content' property<br>
'box-sizing' property<br>
'outline-offset' property<br>
'resize' property<br>
'cursor' property additions<br>
'nav-index', 'nav-up', 'nav-right', 'nav-down', 'nav-left' properties

<tr>
<th>Excludes

<td> none.

<tr>
<th>Extra constraints

<td>none.
</table>

<h2 class="no-num" id="appendix1">Appendix F: Test Suite</h2>

<p>This appendix is <em>informative</em>.

<p> This specification shall refer to a test suite written according to the
<a href="http://www.w3.org/Style/CSS/Test/testsuitedocumentation">CSS Test
Suite Documentation</a> and following the <a
href="http://www.w3.org/Style/CSS/Test/guidelines.html">CSS2.1 Test Case
Authoring Guidelines</a>. The test suite shall allow user agents to verify
their basic conformance to the specification. This test suite does not
pretend to be exhaustive and does not cover all possible combinations of user
interface related features. These tests will be made available from the <a
href="http://www.w3.org/Style/CSS/Test/">CSS Test Suites</a> home page.

<h2 class="no-num" id="index">Index</h2>

<p>This appendix is <em>informative</em>.
<!--begin-index-->

<ul class="indexlist">
<li>appearance, <a href="#appearance0"><strong>#</strong></a>

<li>box-sizing, <a href="#box-sizing0"><strong>#</strong></a>

<li>content, <a href="#content"><strong>#</strong></a>

<li>cursor, <a href="#cursor0"><strong>#</strong></a>

<li>font, <a href="#font"><strong>#</strong></a>

<li>icon, <a href="#icon"><strong>#</strong></a>

<li>invert, <a href="#invert"><strong>#</strong></a>

<li>&lt;appearance&gt;, <a href="#ltappearancegt"><strong>#</strong></a>

<li>MAY, <a href="#may"><strong>#</strong></a>

<li>MUST, <a href="#must"><strong>#</strong></a>

<li>MUST NOT, <a href="#must-not"><strong>#</strong></a>

<li>nav-down, <a href="#nav-down"><strong>#</strong></a>

<li>nav-index, <a href="#nav-index0"><strong>#</strong></a>

<li>nav-left, <a href="#nav-left"><strong>#</strong></a>

<li>nav-right, <a href="#nav-right"><strong>#</strong></a>

<li>nav-up, <a href="#nav-up"><strong>#</strong></a>

<li>OPTIONAL, <a href="#optional"><strong>#</strong></a>

<li>outline, <a href="#outline0"><strong>#</strong></a>

<li>outline-color, <a href="#outline-color0"><strong>#</strong></a>

<li>outline-offset, <a href="#outline-offset0"><strong>#</strong></a>

<li>outline-style, <a href="#outline-style0"><strong>#</strong></a>

<li>outline-width, <a href="#outline-width0"><strong>#</strong></a>

<li>RECOMMENDED, <a href="#recommended"><strong>#</strong></a>

<li>REQUIRED, <a href="#required"><strong>#</strong></a>

<li>resize, <a href="#resize0"><strong>#</strong></a>

<li>SHALL, <a href="#shall"><strong>#</strong></a>

<li>SHALL NOT, <a href="#shall0"><strong>#</strong></a>

<li>SHOULD, <a href="#should"><strong>#</strong></a>

<li>SHOULD NOT, <a href="#should0"><strong>#</strong></a>
</ul>
<!--end-index-->

<h2 class="no-num" id="property">Property index</h2>

<p>This appendix is <em>informative</em>.
<!--begin properties-->

<table class="proptable">
<thead>
<tr>
<th>Property

<th>Values

<th>Initial

<th>Applies&nbsp;to

<th>Inh.

<th>Percentages

<th>Media

<tbody>
<tr valign="baseline">
<td><span class="property"><a href="#appearance0">appearance</a></span>

<td>normal | &lt;appearance&gt; | inherit

<td>normal

<td>all elements

<td>no

<td>N/A

<td>visual, interactive

<tr valign="baseline">
<td><span class="property"><a href="#box-sizing0">box-sizing</a></span>

<td>content-box | border-box | inherit

<td>content-box

<td>all elements that accept width or height

<td>no

<td>N/A

<td>visual

<tr valign="baseline">
<td><span class="property"><a href="#content">content</a></span>

<td>icon

<td>same as CSS 2.1

<td>same as CSS 2.1

<td>same as CSS 2.1

<td>same as CSS 2.1

<td>same as CSS 2.1

<tr valign="baseline">
<td><span class="property"><a href="#cursor0">cursor</a></span>

<td>[ [&lt;uri&gt; [&lt;x&gt; &lt;y&gt;]?,]* [ auto | default | none |
context-menu | help | pointer | progress | wait | cell | crosshair | text |
vertical-text | alias | copy | move | no-drop | not-allowed | e-resize |
n-resize | ne-resize | nw-resize | s-resize | se-resize | sw-resize |
w-resize | ew-resize | ns-resize | nesw-resize | nwse-resize | col-resize |
row-resize | all-scroll ] ] | inherit

<td>auto

<td>all elements

<td>yes

<td>N/A

<td>visual, interactive

<tr valign="baseline">
<td><span class="property"><a href="#font">font</a></span>

<td>&lt;appearance&gt; | status-bar | message-box | caption | small-caption |
inherit

<td>see individual properties in CSS 2.1

<td>all elements

<td>yes

<td>N/A for system values

<td>visual

<tr valign="baseline">
<td><span class="property"><a href="#icon">icon</a></span>

<td>auto | &lt;uri&gt; [, &lt;uri&gt;]* | inherit

<td>auto

<td>all elements

<td>no

<td>N/A

<td>all

<tr valign="baseline">
<td><span class="property"><a href="#nav-index0">nav-index</a></span>

<td>auto | &lt;number&gt; | inherit

<td>auto

<td>all enabled elements

<td>no

<td>n/a

<td>interactive

<tr valign="baseline">
<td><span class="property"><a href="#nav-up">nav-up</a></span>, <span
class="property"><a href="#nav-right">nav-right</a></span>, <span
class="property"><a href="#nav-down">nav-down</a></span>, <span
class="property"><a href="#nav-left">nav-left</a></span>

<td>auto | &lt;id&gt; [ current | root | &lt;target-name&gt; ]? | inherit

<td>auto

<td>all enabled elements

<td>no

<td>N/A

<td>interactive

<tr valign="baseline">
<td><span class="property"><a href="#outline0">outline</a></span>

<td>[ &lt;'outline-color'&gt; || &lt;'outline-style'&gt; ||
&lt;'outline-width'&gt; ] | inherit

<td>see individual properties

<td>all elements

<td>no

<td>N/A

<td>visual

<tr valign="baseline">
<td><span class="property"><a href="#outline-color0">outline-color</a></span>

<td>&lt;color&gt; | invert | inherit

<td>invert

<td>all elements

<td>no

<td>N/A

<td>visual

<tr valign="baseline">
<td><span class="property"><a
href="#outline-offset0">outline-offset</a></span>

<td>&lt;length&gt; | inherit

<td>0

<td>all elements

<td>no

<td>N/A

<td>visual

<tr valign="baseline">
<td><span class="property"><a href="#outline-style0">outline-style</a></span>

<td>auto | &lt;border-style&gt; | inherit

<td>none

<td>all elements

<td>no

<td>N/A

<td>visual

<tr valign="baseline">
<td><span class="property"><a href="#outline-width0">outline-width</a></span>

<td>&lt;border-width&gt; | inherit

<td>medium

<td>all elements

<td>no

<td>N/A

<td>visual

<tr valign="baseline">
<td><span class="property"><a href="#resize0">resize</a></span>

<td>none | both | horizontal | vertical | inherit

<td>none

<td>elements with 'overflow' other than visible

<td>no

<td>N/A

<td>visual
</table>
<!--end properties-->
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