Why doesn't google.com validate?

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Michael Thingmand from Denmark asks:
"Why doesn't google.com validate (according to W3C)?"
This video is part of a "Grab Bag" series in which Matt Cutts, head of Google's webspam team, answers questions from webmasters. We're not currently taking new video questions, so your best bet for getting an answer about webmaster-related search issues is to head to our help forum:
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