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.

The topic of HTML validation has been covered here time and time again - we know Google doesn't downgrade or boost a web site with bad or good HTML validation. We also know that there are cases were ...

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 ...

With HTML forms submissions today, web developers typically must use JavaScript to ensure values are provided when required and are within appropriate ranges and types. HTML5 offers form field ...