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That site was very useful to me when I was learning CSS. I used their validator, but occasionally it would mess up. It's great for learning new webdesign methods though. I would recommend it to anyone learning HTML or any other kind of language.
... and they offers some usefull validators like this HTML and XHTML validator, that checks your site with standard... just take a look: http://validator.w3.org/
W3C is created in 1994, the World Wide Web Consortium (W3C) (http://www.w3.org/) hammers out specifications and guidelines that are intended to promote the web's evolution and ensure that web technologies work well together. And Its director is Tim Berners-Lee (http://www.w3.org/People/Berners-Lee/), the one who invented the web in 1989. Some of the specifications developed by W3C is HTML, XHTML, XML, CSS, and more.