SEO implications of invalid XML for Strict DOCTYPE

StackOverflow https://stackoverflow.com/questions/9236849

문제

I'm working on some search engine optimizations on a variety of websites and have noticed that a number of them contain invalid XHTML and are using the XHTML 1.0 Strict DOCTYPE

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

I wonder how much (if at all) this would affect search engines. Any relevant literature would be greatly appreciated.

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해결책

Matt Cutts from Google said no in 2009. I'd suspect their stance has not changed:

http://www.youtube.com/watch?v=FPBACTS-tyg

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