HTML Checking for Large Sites
Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.
HTML issues tagged as serializable.
Attribute with the local name “xmlns:serif” is not serializable as XML 1.0
The attribute xmlns:serif is not valid. Check this guide for more information on this issue.
An attribute could not be parsed from the HTML input, probably due to a typo. Check this guide for a related HTML issue.
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.