HTML Checking for Large Sites

Rocket Validator automatically checks your pages on the W3C Validator.

CSS: “X”: Parse Error.

A CSS definition for an X property could not be understood by the parser. Check it to ensure that it’s well formed and that it contains an appropriate value.

Related W3C validator issues

Still checking your large sites one page at a time?

Save time using our automated web checker. Let our crawler check your web pages on the W3C Validator.