Just ask the Unicorn. The web's governing body has launched a new validation tool called Unicorn that checks the quality of your website's code against multiple web standards at once.

The free 3 W3C MarkUp Validation Service and 4 W3C CSS Validation Service ensure that your pages meet the exact specifications established by the W3C.

The World Wide Web Consortium, or W3C, has a onsite tool, called CSS Validator, that scans CSS for errors. You can use CSS Validator to find mistakes in your code, then fix the CSS using the scan ...

CSS vendor prefixes seem to cause headaches for just about everyone -- standards bodies, browser makers and web developers alike. Prefixes aren't going away any time soon, but the W3C has given ...

After almost a decade of work, the W3C’s CSS Working Group has published CSS version 2.1 as an official specification. CSS 2.1 first became a W3C Candidate Recommendation in 2004.

After many years CSS 2.1 has finally become a W3C recommendation, which makes it a new internet standard. The new standard is a fix for CSS 2.0 and aims to supersede the previous version of CSS ...