HTML Checking for Large Sites
Rocket Validator automatically checks your pages on the W3C Validator.
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.
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