Make WordPress validate for HTML5 by getting rid of rel=”category tag”
Have you tried validating your WordPress site using the W3C validator thinking your site was up to par with today’s standards? Only to see a long list of errors on your site? Don’t worry, we all have been there, well most of us at least. And there is only one thing to do about the problems, fix them. If your site is using html5, then you probably have a lot of errors complaining about a bad value for your rel attributes (rel=”category tag”)
