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--><!--#set var="title" value="About the W3C HTML Validation Service"
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    <div>
      <h2 id="skip" name="skip">About This Service</h2>
      <p>
        <a href="/">The W3C HTML Validation Service</a> checks HTML documents
        for conformance to W3C HTML and XHTML Recommendations and other
        HTML standards. Related resources include:
      </p>

      <ul>
        <li><a title="Source Code for The W3C HTML Validation Service" href="/source/">Source code availability</a>.</li>
        <li><a href="todo.html">The TODO list for The W3C HTML Validation Service</a>.</li>
        <li><a href="sgml-lib/catalog">DTDs (document types) supported by The
          W3C HTML Validation 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 on The W3C HTML Validation Service</a>.</li>
      </ul>
    </div>

    <div>
      <h2><a name="others">Other resources</a></h2>
      <div>
        <h3>Documentation &amp; Specifications</h3>
        <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>
      </div>
      <div>
        <h3>Online Tools &amp; Other Validators</h3>
        <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>
        </ul>
      </div>
    </div>

    <div>
      <h2><a name="credits">Credits</a></h2>
      <p>
        The W3C HTML Validation Service was created and is maintained by
        <a href="http://www.w3.org/People/Gerald/">Gerald Oskoboiny</a>.
        In a previous incarnation it was known as "The Kinder, Gentler,
        HTML Validator", but has since found a new home at the W3C
        Systems Team where Gerald still slaves away at it.
      </p>
      <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>Documentation and 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://www.htmlhelp.com/%7Eliam/">Liam Quinn</a></li>
            <li><a href="http://www.w3.org/People/D%c3%bcrst/">Martin D&uuml;rst</a></li>
            <li><a href="http://www.webthing.com/~nick/">Nick Kew</a></li>
            <li><a href="http://newsreaders.com/%7Elink/">Terje Bless</a></li>
            <li><a href="http://lists.w3.org/Archives/Public/www-validator/">...and the nice people on www-validator@w3.org.</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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