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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang=en>
<head profile="http://www.w3.org/2006/03/hcard">
<title>CSS TEMPLATE Module Level N</title>
<link href="../default.css" rel=stylesheet type="text/css">
<link href="http://www.w3.org/StyleSheets/TR/W3C-ED.css" rel=stylesheet
type="text/css">
<body>
<div class=head> <!--begin-logo-->
<p><a href="http://www.w3.org/"><img alt=W3C height=48
src="http://www.w3.org/Icons/w3c_home" width=72></a> <!--end-logo-->
<h1>CSS <var class=issue>TEMPLATE</var> Module Level <var
class=issue>N</var></h1>
<h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 23 February
2011</h2>
<dl>
<dt>This version:
<dd><a href="http://www.w3.org/TR/2011/ED-css3-TEMPLATE-20110223">
http://www.w3.org/TR/2011/ED-css3-TEMPLATE-20110223</a>
<dt>Latest version:
<dd><a href="http://www.w3.org/TR/css3-TEMPLATE">
http://www.w3.org/TR/css<var class=issue>3</var>-<var
class=issue>TEMPLATE</var></a>
<dt>Previous version:
<dd><a href="http://www.w3.org/PreviousVersionURI">
http://www.w3.org/PreviousVersionURI</a>
<dt>Editors:
<dd class=vcard><span class=fn>[editor1 name]</span>, <span
class=org>[affiliation (opt.)]</span>, <span class=email>[email address
(opt.)]</span>
<dd class=vcard><span class=fn>[editor2 name]</span>, <span
class=org>[affiliation (opt.)]</span>, <span class=email>[email address
(opt.)]</span>
</dl>
<!--begin-copyright-->
<p class=copyright><a
href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright"
rel=license>Copyright</a> © 2011 <a
href="http://www.w3.org/"><acronym title="World Wide Web
Consortium">W3C</acronym></a><sup>®</sup> (<a
href="http://www.csail.mit.edu/"><acronym title="Massachusetts Institute
of Technology">MIT</acronym></a>, <a href="http://www.ercim.eu/"><acronym
title="European Research Consortium for Informatics and
Mathematics">ERCIM</acronym></a>, <a
href="http://www.keio.ac.jp/">Keio</a>), All Rights Reserved. W3C <a
href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>,
<a
href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a>
and <a
href="http://www.w3.org/Consortium/Legal/copyright-documents">document
use</a> rules apply.</p>
<!--end-copyright-->
<hr title="Separator for header">
</div>
<h2 class="no-num no-toc" id=abstract>Abstract</h2>
<p>CSS is a language for describing the rendering of structured documents
(such as HTML and XML) on screen, on paper, in speech, etc. This module
contains the features of CSS level 3 relating to <var
class=issue>DESCRIBE HERE</var>. It includes and extends the functionality
of CSS level 2 <a href="#CSS21"
rel=biblioentry>[CSS21]<!--{{CSS21}}--></a>, which builds on CSS
level 1 <a href="#CSS1" rel=biblioentry>[CSS1]<!--{{CSS1}}--></a>.
The main extensions compared to level 2 are <var
class=issue>SUMMARIZE HERE</var>.
<h2 class="no-num no-toc" id=status>Status of this document</h2>
<!--begin-status-->
<p>This is a public copy of the editors' draft. It is provided for
discussion only and may change at any moment. Its publication here does
not imply endorsement of its contents by W3C. Don't cite this document
other than as work in progress.
<p>The (<a
href="http://lists.w3.org/Archives/Public/www-style/">archived</a>) public
mailing list <a
href="mailto:www-style@w3.org?Subject=%5Bcss3-TEMPLATE%5D%20PUT%20SUBJECT%20HERE">
www-style@w3.org</a> (see <a
href="http://www.w3.org/Mail/Request">instructions</a>) is preferred for
discussion of this specification. When sending e-mail, please put the text
“css3-TEMPLATE” in the subject, preferably like this:
“[<!---->css3-TEMPLATE<!---->] <em>…summary of
comment…</em>”
<p>This document was produced by the <a href="/Style/CSS/members">CSS
Working Group</a> (part of the <a href="/Style/">Style Activity</a>).
<p>This document was produced by a group operating under the <a
href="/Consortium/Patent-Policy-20040205/">5 February 2004 W3C Patent
Policy</a>. W3C maintains a <a href="/2004/01/pp-impl/32061/status"
rel=disclosure>public list of any patent disclosures</a> made in
connection with the deliverables of the group; that page also includes
instructions for disclosing a patent. An individual who has actual
knowledge of a patent which the individual believes contains <a
href="/Consortium/Patent-Policy-20040205/#def-essential">Essential
Claim(s)</a> must disclose the information in accordance with <a
href="/Consortium/Patent-Policy-20040205/#sec-Disclosure">section 6 of the
W3C Patent Policy</a>.</p>
<!--end-status-->
<p>The following features are at risk: …
<h2 class="no-num no-toc" id=contents>Table of contents</h2>
<!--begin-toc-->
<ul class=toc>
<li><a href="#introduction"><span class=secno>1. </span>Introduction</a>
<ul class=toc>
<li><a href="#context"><span class=secno>1.1. </span>Background</a>
<li><a href="#placement"><span class=secno>1.2. </span>Module
Interactions</a>
<li><a href="#conventions"><span class=secno>1.3. </span>Document
Conventions</a>
<li><a href="#values"><span class=secno>1.4. </span>Values</a>
</ul>
<li><a href="#sample-section"><span class=secno>2. </span>Sample
section</a>
<ul class=toc>
<li><a href="#the-display-model"><span class=secno>2.1. </span>Inner
Display Model: the ‘<code
class=property>display-model</code>’ property</a>
</ul>
<li><a href="#conformance"><span class=secno>3. </span>Conformance</a>
<ul class=toc>
<li><a href="#conformance-classes"><span class=secno>3.1.
</span>Conformance Classes</a>
<li><a href="#partial"><span class=secno>3.2. </span>Partial
Implementations</a>
<li><a href="#experimental"><span class=secno>3.3. </span>Experimental
Implementations</a>
<li><a href="#cr-exit-criteria"><span class=secno>3.4. </span>CR Exit
Criteria</a>
</ul>
<li class=no-num><a href="#acknowledgments">Acknowledgments</a>
<li class=no-num><a href="#references">References</a>
<ul class=toc>
<li class=no-num><a href="#normative-references">Normative
references</a>
<li class=no-num><a href="#other-references">Other references</a>
</ul>
<li class=no-num><a href="#index">Index</a>
<li class=no-num><a href="#property-index">Property index</a>
</ul>
<!--end-toc-->
<h2 id=introduction><span class=secno>1. </span>Introduction</h2>
<h3 id=context><span class=secno>1.1. </span>Background</h3>
<p><em>This section is not normative.</em>
<p><var class=issue>Provide background, motivation, etc.</var>
<h3 id=placement><span class=secno>1.2. </span>Module Interactions</h3>
<p class=issue>Explain, normatively, how this module affects the definition
of CSS.
<p>This module replaces and extends the <var class=issue>SUMMARIZE
HERE</var> features defined in <a href="#CSS21"
rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a> sections <var class=issue>W.X
and Y.Z</var>.
<h3 id=conventions><span class=secno>1.3. </span>Document Conventions</h3>
<p>Conformance requirements are expressed with a combination of descriptive
assertions and RFC 2119 terminology. The key words “MUST”, “MUST
NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”,
“SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in the
normative parts of this document are to be interpreted as described in RFC
2119. However, for readability, these words do not appear in all uppercase
letters in this specification.
<p>All of the text of this specification is normative except sections
explicitly marked as non-normative, examples, and notes. <a
href="#RFC2119" rel=biblioentry>[RFC2119]<!--{{!RFC2119}}--></a>
<p>Examples in this specification are introduced with the words “for
example” or are set apart from the normative text with
<code>class="example"</code>, like this:
<div class=example>
<p>This is an example of an informative example.</p>
</div>
<p>Informative notes begin with the word “Note” and are set apart from
the normative text with <code>class="note"</code>, like this:
<p class=note>Note, this is an informative note.
<h3 id=values><span class=secno>1.4. </span>Values</h3>
<p>This specification follows the <a
href="http://www.w3.org/TR/CSS21/about.html#property-defs">CSS property
definition conventions</a> from <a href="#CSS21"
rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a>. Value types not defined in
this specification are defined in CSS Level 2 Revision 1 <a
href="#CSS21" rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a>. Other CSS
modules may expand the definitions of these value types: for example <a
href="#CSS3COLOR" rel=biblioentry>[CSS3COLOR]<!--{{CSS3COLOR}}--></a>,
when combined with this module, expands the definition of the
<color> value type as used in this specification.
<p>In addition to the property-specific values listed in their definitions,
all properties defined in this specification also accept the <a
href="http://www.w3.org/TR/CSS21/cascade.html#value-def-inherit">inherit</a>
keyword as their property value. For readability it has not been repeated
explicitly.
<h2 id=sample-section><span class=secno>2. </span>Sample section</h2>
<p>Look at the mark-up in this section for examples. See the <a
href="../bin/README">documentation</a> for more precise instructions. The
companion of this template shows the <a href=Overview.html>processed
result</a>. (The icon of Woolly is just for fun. It will not appear on
public WDs.)
<p>To refer to HTML, use <a href="#HTML40"
rel=biblioentry>[HTML40]<!--{{HTML40}}--></a> (note the double square
brackets). To make a normative reference, insert a “!”, like
this: <a href="#CSS3SYN" rel=biblioentry>[CSS3SYN]<!--{{!CSS3SYN}}--></a>
The currently available <a
href="http://www.w3.org/Style/Group/css3-src/biblio.ref">list of
bibliographic data</a> can of course be extended.
<p>We write about a property such as ‘<a href="#display-model"><code
class=property>display-model</code></a>’ like this and about a piece
of CSS code like this: ‘<code class=css>foo: bar</code>’.
Inline HTML and XML are similar, but use the CODE element: <code
class=html><blockquote>...</blockquote></code> and <code
class=xml><r:xyz>...</r:xyz></code>.
<p class=note>Note that the property will automatically be linked to its
definition.
<p>To put <span class=index id=terms>terms</span> into the <span
class=index-def id=index0>index</span>, there are many <span class=index
id=variants title=variant>variants</span>, but hopefully the <span
class=index id=simplest title="simple|simpler|simplest">simplest</span>
will be the most <span class=index id=common
title="frequency::common">common</span>. But a little more <span
class=index id=work title="work|resource::time spent">work</span> now will
help many people for a long time.
<p class=note>Note that you can add non-normative notes like this.
<p>Of course, multi-paragraph notes are also possible: just enclose them in
a DIV:
<div class=note>
<p>Note that this note is a multi-paragraph note.</p>
<p>It doesn't <em>need</em> to have two paragraphs, but it could.</p>
</div>
<p>Displayed examples come in eight different types: CSS examples that need
no separate paragraph of explanation are put in a simple PRE:
<pre class=example>EM { font-style: italic }</pre>
<p>CSS examples that need extra text need a DIV.
<div class=example>
<p>The following example is the same as the previous one, but now it is
explained:</p>
<pre>EM { font-style: italic }</pre>
</div>
<p>Illegal CSS examples (examples of errors) are the same, but with class
"illegal-example". Examples of HTML and XML code have class "html" and
"xml" respectively, but are otherwise ditto.
<p>A formal definition of a property looks like this:
<h3 id=the-display-model><span class=secno>2.1. </span>Inner Display Model:
the ‘<a href="#display-model"><code
class=property>display-model</code></a>’ property</h3>
<table class=propdef>
<tbody>
<tr>
<th>Name:
<td><dfn id=display-model>display-model</dfn>
<tr>
<th>Value:
<td>inline-inside | block-inside | table | ruby | icon
<tr>
<th>Initial:
<td>text
<tr>
<th>Applies to:
<td>all elements
<tr>
<th>Inherited:
<td>no
<tr>
<th>Percentages:
<td>N/A
<tr>
<th>Media:
<td>visual
<tr>
<th>Computed value:
<td>specified value
</table>
<dl>
<dt><dfn id=value-name>‘<code
class=css>value-name</code>’</dfn>
<dd>Define values using a DL
</dl>
<p><dfn id=cross-references>Cross-references</dfn> are created by enclosing
a term or phrase in <dfn> (like the word <a
href="#cross-references"><em>cross-references</em></a> earlier in this
sentence). Then any element with the same content will automatically be
linked. For example: <a href="#cross-references">cross-references</a>.
<p>And a figure with a caption is done like this:
<div class=figure>
<p><img alt="A table with a caption above it; both have margins and the
margins between them are collapsed, as is normal for vertical margins."
src=corner.png>
<p class=caption>Just a random image. SVG would be nice, but maybe SVG
isn't sufficiently easy to use yet. W3C prefers PNG over GIF (obviously,
since PNG is a W3C Rec).
</div>
<p>Don't forget to write the longdesc.
<p class=issue>An open issue or editorial remark is OK in a WD, but they
should be resolved/removed before the document goes to “CR”
(Candidate Recommendation). Use class=“issue”.
<h2 id=conformance><span class=secno>3. </span>Conformance</h2>
<h3 id=conformance-classes><span class=secno>3.1. </span>Conformance
Classes</h3>
<p>Conformance to <var class=issue>CSS TEMPLATE Module</var> is defined for
three conformance classes:
<dl>
<dt><dfn id=style-sheet title="style sheet!!as conformance class">style
sheet</dfn>
<dd>A <a href="http://www.w3.org/TR/CSS21/conform.html#style-sheet">CSS
style sheet</a>.
<dt><dfn id=renderer>renderer</dfn>
<dd>A <a href="http://www.w3.org/TR/CSS21/conform.html#user-agent">UA</a>
that interprets the semantics of a style sheet and renders documents that
use them.
<dt><dfn id=authoring-tool>authoring tool</dfn>
<dd>A <a href="http://www.w3.org/TR/CSS21/conform.html#user-agent">UA</a>
that writes a style sheet.
</dl>
<p>A style sheet is conformant to <var class=issue>CSS TEMPLATE
Module</var> if all of its declarations that use properties defined in
this module have values that are valid according to the generic CSS
grammar and the individual grammars of each property as given in this
module.
<p>A renderer is conformant to <var class=issue>CSS TEMPLATE Module</var>
if, in addition to interpreting the style sheet as defined by the
appropriate specifications, it supports all the properties defined by <var
class=issue>CSS TEMPLATE Module</var> by parsing them correctly and
rendering the document accordingly. However, the inability of a UA to
correctly render a document due to limitations of the device does not make
the UA non-conformant. (For example, a UA is not required to render color
on a monochrome monitor.)
<p>An authoring tool is conformant to <var class=issue>CSS TEMPLATE
Module</var> if it writes syntactically correct style sheets, according to
the generic CSS grammar and the individual grammars of each property in
this module.
<h3 id=partial><span class=secno>3.2. </span>Partial Implementations</h3>
<p>So that authors can exploit the forward-compatible parsing rules to
assign fallback values, CSS renderers <strong>must</strong> treat as
invalid (and <a
href="http://www.w3.org/TR/CSS21/conform.html#ignore">ignore as
appropriate</a>) any at-rules, properties, property values, keywords, and
other syntactic constructs for which they have no usable level of support.
In particular, user agents <strong>must not</strong> selectively ignore
unsupported component values and honor supported values in a single
multi-value property declaration: if any value is considered invalid (as
unsupported values must be), CSS requires that the entire declaration be
ignored.
<h3 id=experimental><span class=secno>3.3. </span>Experimental
Implementations</h3>
<p>To avoid clashes with future CSS features, the CSS specifications
reserve a <a
href="http://www.w3.org/TR/CSS21/syndata.html#vendor-keywords">prefixed
syntax</a> for proprietary property and value extensions to CSS. The CSS
Working Group recommends that experimental implementations of features in
CSS Working Drafts also use vendor-prefixed property or value names. This
avoids any incompatibilities with future changes in the draft. Once a
specification reaches the Candidate Recommendation stage, implementors
should implement the non-prefixed syntax for any feature they consider to
be correctly implemented according to spec.
<h3 id=cr-exit-criteria><span class=secno>3.4. </span>CR Exit Criteria</h3>
<p class=issue>[Change or remove the following CR exit criteria if the spec
is not a module, but, e.g., a Note or a profile. This text was <a
href="/Style/CSS/Tracker/actions/44"> decided on 2008-06-04.</a>]
<p id=cr-exit-criteria> For this specification to be advanced to Proposed
Recommendation, there must be at least two independent, interoperable
implementations of each feature. Each feature may be implemented by a
different set of products, there is no requirement that all features be
implemented by a single product. For the purposes of this criterion, we
define the following terms:
<dl>
<dt>independent
<dd>each implementation must be developed by a different party and cannot
share, reuse, or derive from code used by another qualifying
implementation. Sections of code that have no bearing on the
implementation of this specification are exempt from this requirement.
<dt>interoperable
<dd>passing the respective test case(s) in the official CSS test suite,
or, if the implementation is not a Web browser, an equivalent test. 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.
<dt>implementation
<dd>a user agent which:
<ol class=inline>
<li>implements the specification.
<li>is available to the general public. The implementation may be a
shipping product or other publicly available version (i.e., beta
version, preview release, or “nightly build”). Non-shipping product
releases must have implemented the feature(s) for a period of at least
one month in order to demonstrate stability.
<li>is not experimental (i.e., a version specifically designed to pass
the test suite and is not intended for normal usage going forward).
</ol>
</dl>
<p>The specification will remain Candidate Recommendation for at least six
months.
<h2 class=no-num id=acknowledgments>Acknowledgments</h2>
<p><var class=issue>[acknowledgments]</var>
<h2 class=no-num id=references>References</h2>
<h3 class=no-num id=normative-references>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. <a
href="http://www.w3.org/TR/2010/WD-CSS2-20101207"><cite>Cascading Style
Sheets Level 2 Revision 1 (CSS 2.1) Specification.</cite></a> 7 December
2010. W3C Working Draft. (Work in progress.) URL: <a
href="http://www.w3.org/TR/2010/WD-CSS2-20101207">http://www.w3.org/TR/2010/WD-CSS2-20101207</a>
</dd>
<!---->
<dt id=CSS3SYN>[CSS3SYN]
<dd>L. David Baron. <a
href="http://www.w3.org/TR/2003/WD-css3-syntax-20030813"><cite>CSS3
module: Syntax.</cite></a> 13 August 2003. W3C Working Draft. (Work in
progress.) URL: <a
href="http://www.w3.org/TR/2003/WD-css3-syntax-20030813">http://www.w3.org/TR/2003/WD-css3-syntax-20030813</a>
</dd>
<!---->
<dt id=RFC2119>[RFC2119]
<dd>S. Bradner. <a href="http://www.ietf.org/rfc/rfc2119.txt"><cite>Key
words for use in RFCs to Indicate Requirement Levels.</cite></a> Internet
RFC 2119. URL: <a
href="http://www.ietf.org/rfc/rfc2119.txt">http://www.ietf.org/rfc/rfc2119.txt</a>
</dd>
<!---->
</dl>
<!--end-normative-->
<h3 class=no-num id=other-references>Other 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>Håkon Wium Lie; Bert Bos. <a
href="http://www.w3.org/TR/2008/REC-CSS1-20080411"><cite>Cascading Style
Sheets (CSS1) Level 1 Specification.</cite></a> 11 April 2008. W3C
Recommendation. URL: <a
href="http://www.w3.org/TR/2008/REC-CSS1-20080411">http://www.w3.org/TR/2008/REC-CSS1-20080411</a>
</dd>
<!---->
<dt id=CSS21>[CSS21]
<dd>Bert Bos; et al. <a
href="http://www.w3.org/TR/2010/WD-CSS2-20101207"><cite>Cascading Style
Sheets Level 2 Revision 1 (CSS 2.1) Specification.</cite></a> 7 December
2010. W3C Working Draft. (Work in progress.) URL: <a
href="http://www.w3.org/TR/2010/WD-CSS2-20101207">http://www.w3.org/TR/2010/WD-CSS2-20101207</a>
</dd>
<!---->
<dt id=CSS3COLOR>[CSS3COLOR]
<dd>Tantek Çelik; Chris Lilley; L. David Baron. <a
href="http://www.w3.org/TR/2010/PR-css3-color-20101028"><cite>CSS Color
Module Level 3.</cite></a> 28 October 2010. W3C Proposed Recommendation.
(Work in progress.) URL: <a
href="http://www.w3.org/TR/2010/PR-css3-color-20101028">http://www.w3.org/TR/2010/PR-css3-color-20101028</a>
</dd>
<!---->
<dt id=HTML40>[HTML40]
<dd>Ian Jacobs; David Raggett; Arnaud Le Hors. <a
href="http://www.w3.org/TR/1998/REC-html40-19980424"><cite>HTML 4.0
Specification.</cite></a> 24 April 1998. W3C Recommendation. URL: <a
href="http://www.w3.org/TR/1998/REC-html40-19980424">http://www.w3.org/TR/1998/REC-html40-19980424</a>
</dd>
<!---->
</dl>
<!--end-informative-->
<h2 class=no-num id=index>Index</h2>
<!--begin-index-->
<ul class=indexlist>
<li>authoring tool, <a href="#authoring-tool" title="authoring
tool"><strong>3.1.</strong></a>
<li>Cross-references, <a href="#cross-references"
title=Cross-references><strong>2.1.</strong></a>
<li>display-model, <a href="#display-model"
title=display-model><strong>2.1.</strong></a>
<li>frequency
<ul>
<li>common, <a href="#common" title="frequency, common">2.</a>
</ul>
<li>index, <a href="#index0" title=index><strong>2.</strong></a>
<li>renderer, <a href="#renderer" title=renderer><strong>3.1.</strong></a>
<li>resource
<ul>
<li>time spent, <a href="#work" title="resource, time spent">2.</a>
</ul>
<li>simple, <a href="#simplest" title=simple>2.</a>
<li>simpler, <a href="#simplest" title=simpler>2.</a>
<li>simplest, <a href="#simplest" title=simplest>2.</a>
<li>style sheet
<ul>
<li>as conformance class, <a href="#style-sheet" title="style sheet, as
conformance class"><strong>3.1.</strong></a>
</ul>
<li>terms, <a href="#terms" title=terms>2.</a>
<li>‘<code class=css>value-name</code>’, <a href="#value-name"
title="''value-name''"><strong>2.1.</strong></a>
<li>variant, <a href="#variants" title=variant>2.</a>
<li>work, <a href="#work" title=work>2.</a>
</ul>
<!--end-index-->
<h2 class=no-num id=property-index>Property index</h2>
<!--begin-properties-->
<table class=proptable>
<thead>
<tr>
<th>Property
<th>Values
<th>Initial
<th>Applies to
<th>Inh.
<th>Percentages
<th>Media
<tbody>
<tr valign=baseline>
<td><a class=property href="#display-model">display-model</a>
<td>inline-inside | block-inside | table | ruby | icon
<td>text
<td>all elements
<td>no
<td>N/A
<td>visual
</table>
<!--end-properties-->
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