Check this link: W3.org validator That's an amazing fact! We say that an html or xhtml validated website gets a higher rank in google, whereas Google itself is not valid! Same thing for microsoft website, and ............ for Digital Point forum.
Google does NOT need Google YOU NEED Google in addition Google KNOWS exactly which html errors are acceptable for clean file parsing/indexing most users out there have NO such accurate knowledge
I think that validator stuff is a lot of BS. I have plenty of sites at the top of the serp's in all 3 major search engines and I never use it when building my sites from scratch.
Microsoft is never w3c valid . It is only IE compliant . lol Validated html/xhtml get higher rank in yahoo , not in google .
Google has never passed HTML or XHTML. The developers just try and get it to work with every browser out there.