Machine-readable (DTDs)

A Document Type Definition (DTD) is a formal way of specifying the valid tags, attributes, entities, and relationships for a markup language in SGML syntax. DTDs can be used with validators and SGML-aware editors to create documents which conform to the HTML specifications. Below are links to all of the current DTDs for HTML. The ``strict'' versions of DTDs can be used to create documents which avoid the elements of a previous version of HTML that have since been deprecated.

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Specifications

Machine-readable (DTDs)

HTML 1.0 DTD

Last checked: 4/2/1999 16:59:30

HTML 1.0 DTD - strict version

Last checked: 4/2/1999 17:00:03

HTML 2.0 DTD

Last checked: 4/2/1999 17:00:28

HTML 2.0 DTD - strict version

Last checked: 4/2/1999 17:01:00

HTML 3.0 DTD

Last checked: 4/2/1999 17:01:28

HTML 3.2 DTD

Last checked: 4/2/1999 17:01:58