For compatibility with existing content and prior specifications, this specification describes two authoring formats: one based on XML (referred to as XHTML5), and one using a custom format inspired by SGML (referred to as HTML5). Implementations may support only one of these two formats, although supporting both is encouraged.
XML documents using elements from the XHTML namespace that use the new features described in this specification and that are served over the wire (e.g. by HTTP) must be sent using an XML MIME type such as application/xml or application/xhtml+xml and must not be served as text/html. [RFC3023]
These XML documents may contain a DOCTYPE if desired, but this is not required to conform to this specification.
HTML documents that use the new features described in this specification and that are served over the wire (e.g. by HTTP) must be sent as text/html and must start with the following DOCTYPE: .
More detail are at
http://whatwg.org/specs/web-apps/current-work/#html5
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