Here we go – Matt Cutts explains why W3C validation should be used when developing any site (if at all possible, as sometimes it is not, depending on the browser) and also why Google doesn’t look at site/page validation when determining ranking.
We still believe that clean, valid and accessible code will help your site do better in regards to SEO, plus assist with browser compatibility and load time – regardless if Google factors it into their ranking algorithm or not. It’s just simple site development best practices…



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I think that some people are somewhat obsessed with w3c standards, yes, it’s nice that it validates, but is nothing really necessary (and sometimes it blocks older or different browsers unless a lot of hacks are involved).
Thanks for your comment, Cesar – I agree – but it is nice if it validates
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