... SGML . The text/html content type . In this section, we begin the specification of HTML 4.0, starting with the contract between authors, documents, users, and user agents. ... These recommendations are not normative and conformance with this specification does not depend on their realization. ... An HTML document is an SGML document that meets the constraints of this specification. ... A user is a person who interacts with a user agent to view, hear, or otherwise use a rendered HTML document. ...

... ELEMENT (%heading;) - - (%inline;)* -- heading --> <!ATTLIST (%heading;) %attrs; -- %coreattrs, %i18n, %events -- > <!- ... BUTTON) !-- attribute name required for all but submit reset -- ! ELEMENT INPUT - O EMPTY -- form control -- ! ATTLIST INPUT % attrs ; -- % coreattrs , % i18n , % events -- type %InputType; TEXT -- what kind of widget is needed -- name CDATA # IMPLIED -- submit as part of form -- value CDATA # IMPLIED -- required for radio and checkboxes -- checked (checked) ...

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