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<!doctype html public '-//W3C//DTD HTML 4.01//EN'
'http://www.w3.org/TR/html4/strict.dtd'>
<html lang="en">
<title>Cascading Style Sheets, level 2 revision 1</title>
<body>
<div class="head">
<p><a href="http://www.w3.org/"><img alt="W3C" height="48"
src="http://www.w3.org/Icons/w3c_home" width="72"></a>
<h1 id="title">Cascading Style Sheets, level 2 revision 1<br>
CSS 2.1 Specification</h1>
<h2 id="W3C-doctype">W3C _THE_STATUS_ _THE_DATE_</h2>
<dl>
<dt>This version:
<dd><a href="_THIS_VERSION_">
_THIS_VERSION_</a>
<dt>Latest version:
<dd><a href="_THE_LATEST_VERSION_">
_THE_LATEST_VERSION_</a>
<dt>Previous version:
<dd><a href="_THE_PREVIOUS_VERSION_">
_THE_PREVIOUS_VERSION_</a>
<dt>Editors:
<dd><a lang=nl href="http://www.w3.org/People/Bos/">
Bert Bos</a>
<bert @w3.org>
<dd><a lang=tr href="http://tantek.com/">
Tantek Çelik</a>
<tantekc @microsoft.com>
<dd><a lang=en href="http://ian.hixie.ch/">
Ian Hickson</a>
<ian @hixie.ch>
<dd><a lang=no href="http://people.opera.com/howcome/">
Håkon Wium Lie</a>
<howcome @opera.com>
</dl>
<!--<p>Please refer to the <a
href="_THE_UPDATE_DIR_/_THE_ID_-errata.html"><strong>
errata</strong></a> for this document, which may include some
normative corrections.-->
<p>This document is also available in these non-normative formats:
<a href="css2.txt">plain text</a>,
<a href="css2.tgz">gzip'ed tar file</a>,
<a href="css2.zip">zip file</a>,
<a href="css2.ps.gz">gzip'ed PostScript</a>,
<a href="css2.pdf">PDF</a>.
See also <a
href="_THE_UPDATE_DIR_/translations.html"><strong>
translations</strong></a>.
<p class="copyright"><a
href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">
Copyright</a> © 2003 <a href="http://www.w3.org/"><abbr
title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup> (<a
href="http://www.lcs.mit.edu/"><abbr title="Massachusetts Institute
of Technology">MIT</abbr></a>, <a
href="http://www.ercim.org/"><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>,
<a
href="http://www.w3.org/Consortium/Legal/copyright-documents">document
use</a> and <a
href="http://www.w3.org/Consortium/Legal/copyright-software">software
licensing</a> rules apply.</p>
<hr title="Separator from Header">
</div>
<h2 id=abstract>Abstract</h2>
<p>This specification defines Cascading Style Sheets, level 2
revision 1 (CSS 2.1). CSS 2.1 is a style sheet language
that allows
authors and users to attach style (e.g., fonts and spacing) to
structured documents (e.g., HTML documents and XML
applications). By separating the presentation style of documents from
the content of documents, CSS 2.1 simplifies Web authoring and
site maintenance.
<P>CSS 2.1 builds on CSS2 [[CSS2]] which builds on CSS1 [[CSS1]].
It supports media-specific style sheets so that authors may tailor the
presentation of their documents to visual browsers, aural devices,
printers, braille devices, handheld devices, etc. It also supports
content positioning, table layout, features for internationalization
and some properties related to user interface.
<p>CSS 2.1 corrects a few errors in CSS2 (the most important
being a new definition of the height/width of absolutely positioned
elements, more influence for HTML's "style" attribute and a new
calculation of the 'clip' property), and adds a few highly requested
features which have already been widely implemented.
But most of all CSS 2.1
represents a "snapshot" of CSS usage: it consists of all CSS features
that are implemented interoperably at the date of publication of the Recommendation.
<h2 id=status>Status of this document</h2>
<p>This is a W3C <a
href="http://www.w3.org/Consortium/Process/Process-19991111/tr.html#last-call">Last
Call Working Draft</a>. "Last call" means that the working group
believes that this specification is ready and therefore wishes this to
be the last call for comments. If the feedback is positive, the
working group plans to submit it for consideration as a <a
href="http://www.w3.org/TR/#About">W3C Candidate Recommendation</a>.
Comments can be sent until <strong>10 October 2003.</strong>
<p>This document is produced by the <a
href="http://www.w3.org/Style/Group/">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>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 drafts in the Style area. When
commenting on this draft, please put the text "CSS21" in the subject,
preferably like this: "[CSS21] <summary of comment>"
<p><em>This section describes the status of this document at the time
of its publication. Other documents may supersede this document. A
list of current W3C publications and the latest revision of this
technical report can be found in the <a href="/TR/">W3C technical
reports index</a> at <a href="/TR/">http://www.w3.org/TR/.</a> It is
inappropriate to use W3C Working Drafts as reference material or to
cite them as other than "work in progress."</em>
<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></p>
<h3 class="no-num" id="crec">Candidate Recommendation Exit Criteria</h3>
<p>For this specification to exit the CR stage, the following
conditions must be met:</p>
<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</dt>
<dd>
<p>
A section or subsection of the specification.
</p>
</dd>
<dt>interoperable</dt>
<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 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>
</dd>
<dt>implementation</dt>
<dd>
<p>a user agent which:</p>
<ol>
<li>implements the feature.</li>
<li>is available (i.e. publicly downloadable or available
through some other public point of sale mechanism). This is the
"show me" requirement.</li>
<li>is shipping (i.e. development, private or unofficial
versions are insufficient).</li>
<li>is not experimental (i.e. is intended for a wide audience
and could be used on a daily basis).</li>
</ol>
</dd>
</dl>
</li>
<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.</p></li>
<li><p>The CR period will be extended if implementations are slow to
appear.</p></li>
<li><p>Features that were not in CSS1 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.</p></li>
<li><p>Features will also be dropped 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.</p></li>
</ol>
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<div class="toc">
<h2><a name="minitoc">Quick Table of Contents</a></h2>
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<div class="toc">
<h2><a name="toc">Full Table of Contents</a></h2>
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</div>
</body>
</html>
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