HTML Checking for Large Sites

Rocket Validator automatically checks your pages on the W3C Validator.

The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.

Malformed comment syntax has been found, check out the affected comment.

HTML comments are helpful to leave notes about the code right next to it. To create a comment, it must start with <!-- and end with -->, as in this example:

<!-- Good comment -->

Comments can
be multi-line

A common cause for a malformed comment is using too many hyphens (-) as in this example:

<!-- Wrong comment --->

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.