All it contains is the tag name of the root element of the document , HTML .
HTML5 uses a DOCTYPE declaration which is very short , due to its lack of references to a DTD in the form of a URL or FPI .
All HTML5 contains is the tag name of the root element of the document , HTML .
HTML5 uses a DOCTYPE declaration which is very short , due to its lack of references to a DTD in the form of a URL or FPI .