Most top-ranking websites fail HTML validation. Google explains why perfect code isn’t required, and what matters instead. Many top websites have invalid homepage HTML, yet still rank well.

When Google updated their Webmaster Guidelines yesterday, one of the changed was changes was around valid HTML. Before it read, "Check for broken links and correct HTML." and now it reads "Ensure that ...

Does Google Penalize For Invalid HTML? Matt Cutts Says No It's easy to make a mistake when trying to create perfect HTML code that validates correctly every time. So how important is valid HTML when ...