HTML Checking for Large Sites

Rocket Validator automatically checks your pages on the W3C Validator.

Attribute “X” is not serializable as XML 1.0.

An attribute could not be parsed from the HTML input, probably due to a typo. Check this guide for a related HTML issue.

Related W3C validator issues

When was the last time you validated your whole site?

Keep your sites healthy checking for A11Y/HTML issues on an automated schedule.