What is correct Tidy?

Rudi Meinhardt <[email protected]> Tue, 8 Mar 2011 12:06:31 +0000 (GMT)

Newsgroups	gmane.comp.web.html-tidy.user
Message-ID	<[email protected]>

I have the short but important question: Is my HTML on http://www.blkk.de really clean and tidy?
Sometimes I get some errors and I really want to have it 100 percent tidy because of usability etc.

thanks for your help!