Is HTML validation necessary for ranking?

Hi Matt, in a previous video you stated that validation of HTML wasn't really important for ranking/SEO. This confuses me, would Google really want to send it's users to websites which would be broken for a lot of them? Jimmy "@Feldon" Wirsborg, Stockholm, Sweden

Russian subtitles provided by Mike Shakin.

Note: the grammatical error was fixed in the video, but the question as submitted can be seen above.

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