Google believes that pages that validate do not rank high. Having valid HTML to boost up ranking in Google and other search engine may not have much impact on your ranking and this is what most SEOs believe.
In a recent You Tube Video, Google's Matt Cutts explained why Google.com does not validate pages. He also said that Google doesn't "give any sort of boost to web pages that validate." He pointed out because "the vast majority of pages on the web don't validate," including Google.com.
Here is the video to give more details:
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Navneet Kaushal, CEO PageTraffic is a trusted authority in the search engine marketing industry. He is a featured author at Web Pro News, Search Newz, Website Notes, DevWebPro, SEO Article and Web Help Now among many others.
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{ 2 comments… read them below or add one }
They probably admit one thing, but they do take a different behavior apparently. I've two test case where for minor keywords I've been able to shift up into the SERP just adjusting and fixing all the HTML code.
It's weird tho!
SEO experts always told me I had to validate my html to rank higher.
Intresting article. thanks!