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HTML5 says: ]] A DOCTYPE containing an obsolete permitted DOCTYPE string is an obsolete permitted DOCTYPE. Authors should not use obsolete permitted DOCTYPEs, as they are unnecessarily long. [[ http://www.w3.org/TR/html5/syntax.html#obsolete-permitted-doctype Thus is is no error to use the obsolete permitted DOCTYPE variants that HTMl5 lists http://www.w3.org/TR/html5/syntax.html#obsolete-permitted-doctype-string However, despite that it is no error, the NU validator reports them as bogus errors. Please fix by changing the message from an error message to a warning message, similar to the warning message for a border="0" attribute on the <img> element: http://tinyurl.com/b58gtf7 (If you disagree with HTML5 making it conforming, please file a bug.)