putting hml at my website

How do I add this to my website ? I mean where can I see my site in hml ?
Thanks
eirikur

 <p>
    <a href="http://validator.w3.org/check?uri=referer"><img
        src="http://www.w3.org/Icons/valid-xhtml10"
        alt="Valid XHTML 1.0 Strict" height="31" width="88" /></a>
  </p>

Received on Friday, 12 December 2008 14:43:17 UTC