This document (demo.html) passes the W3C validator. However, it is not
valid, as it contains four markup errors.

Can you spot them?

See also:
   http://validator.w3.org/check?uri=http%3A%2F%2Fwww.damowmow.com%2Fmozilla%2Fdemos%2Fvalidation%2Fgigo%2Fdemo.html&charset=%28detect+automatically%29&doctype=Inline

   http://ln.hixie.ch/?start=1022362838&count=1

   http://lists.w3.org/Archives/Public/www-style/2002Aug/0182.html