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<div>
<h2>About the W3C HTML Validation Service</h2>
<p>
<a href="/">This service</a> checks HTML documents for
conformance to W3C HTML and XHTML Recommendations and other
HTML standards. Related resources include:
</p>
<ul>
<li><a href="/source/">Source code availability</a>.</li>
<li><a href="todo.html">The to-do list for the service</a>.</li>
<li><a href="sgml-lib/catalog">DTDs (document types) supported by this
service</a> (the SGML catalog).</li>
<li><a href="http://lists.w3.org/Archives/Public/www-validator/">The
www-validator mailing list</a>.</li>
<li><a href="feedback.html">How to provide feedback</a>.</li>
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</ul>
</div>
<div>
<h2><a name="others">Other resources</a></h2>
<p>
Documentation/specifications:
</p>
<ul>
<li><a href="http://www.w3.org/MarkUp/">W3C's HTML home page</a>.</li>
<li><a href="http://www.w3.org/TR/html401/">The HTML 4.01
specification</a>.</li>
<li><a href="http://www.w3.org/TR/xhtml1/">XHTML 1.0:
The Extensible HyperText Markup Language</a>.</li>
<li><a href="http://www.w3.org/TR/xhtml11/">XHTML 1.1:
Module-based XHTML</a>.</li>
</ul>
<p>
Online tools/validators:
</p>
<ul>
<li>The <a
href="http://www.htmlhelp.org/tools/validator/">WDG HTML
validator</a> is another excellent online validation service.</li>
<li><a href="http://arealvalidator.com/">A Real Validator</a>
is a shareware HTML syntax checker for Windows systems,
from the author of the WDG validator.</li>
<li><a href="http://valet.webthing.com/">Site Valet</a> by Nick Kew
is a comprehensive set of tools for checking and monitoring your
web sites.</li>
<li>Clean up your HTML using <a
href="http://www.w3.org/People/Raggett/tidy/">HTML tidy</a>
(or use Site Valet's <a href="http://valet.webthing.com/tidy/">web
interface to tidy</a>.)</li>
<li>Validate your <a href="http://www.w3.org/Style/CSS/">CSS</a> using
the <a href="http://jigsaw.w3.org/css-validator/">W3C CSS
Validation Service</a>.</li>
<li>Validate your <a href="http://www.w3.org/RDF/">RDF</a> using
the <a href="http://www.w3.org/RDF/Validator/">W3C RDF
Validation Service</a>.</li>
<li>Validate your <a href="http://www.w3.org/XML/Schema">XML Schema</a>
documents using the <a
href="http://www.w3.org/2001/03/webdata/xsv">W3C
XML Schema Validator</a>.</li>
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</ul>
</div>
<div>
<h2><a name="credits">Credits</a></h2>
<p>
This service uses:
</p>
<ul>
<li>
<a href="http://www.jclark.com/">James Clark</a>'s excellent <a
href="http://www.jclark.com/sp/">SGML parser</a>.
</li>
<li>
The <a href="http://www.linpro.no/lwp/">LWP Perl Modules</a>
by Gisle Aas and Martijn Koster for retrieving documents.
</li>
<li>SGML error explanations originally written by Scott Bigham.</li>
<li>Open source software including <a
href="http://httpd.apache.org/">Apache</a>, <a
href="http://www.perl.com/">Perl</a>, and <a
href="http://www.debian.org/">Debian GNU/Linux</a>.<a
href="http://www.debian.org/"><img
style="float: right; clear: both; width: 88px; height: 30px"
src="images/debian.png" alt="[Powered by Debian]" /></a>
</li>
<li>
Patches and ideas from:
<ul>
<li><a href="http://newsreaders.com/%7Elink/">Terje Bless</a></li>
<li><a href="http://www.htmlhelp.com/%7Eliam/">Liam Quinn</a></li>
</ul>
</li>
</ul>
</div>
<p>
The
<a href="http://lists.w3.org/Archives/Public/www-html/1994Jul/0015">first
online HTML validation service</a> was created by
<a href="http://www.w3.org/People/Connolly/">Dan Connolly</a> and
<a href="http://www.markgaither.com/">Mark Gaither</a>.
</p>
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