HTML Checking for Large Sites
Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.
HTML issues tagged as numeric character reference.
According to the HTML specification, text must not contain control characters other than space characters.
In particular, the control character 
escapes the Unicode control character “CARRIAGE RETURN” are not allowed.
An alternative is using the character reference which escapes the Unicode control character “LINE FEED” that is defined to be a space character, so it’s allowed in HTML text.
6,250 HTML checks per week. Fully automated.
Save time using our automated web checker. Let our crawler check your web pages on the W3C Validator.