The WHATWG Blog ? WHATWG and HTML 5 FAQ

The WHATWG Blog ? WHATWG and HTML 5 FAQ: " In XHTML, there is no DOCTYPE required. You may include one if you wish, but this is not recommended because they are only relevant when using a validating parser, but browsers do not use validating parsers anyway.
If there is no DTD, how can I validate my page?

With a conformance checker."