New posts in W3C Validation

Google fonts URL break HTML5 Validation on w3.org

HTML5 Validation error with select required attribute

Can I use non existing CSS classes?

How widely supported is the iframe attribute "allowfullscreen"?

How do I fix "Error: A charset attribute on a meta element found after the first 512 bytes."

How to make a sitemap link in the page head pass the W3C validator?

Element name gcse:searchbox-only cannot be represented as XML 1.0

W3C validation for complete site

Is <link> (not rel="stylesheet") allowed to be used in <body>?

"Attribute name not allowed on element div at this point"