- Hypertext Markup Language 2.0
- Shows information on HTML as an application of SGML, document structure and forms. Includes details on references and its coded character set.
- ISO HTML 4.0 Specification
- Contains details on HTML 4.0 with information on basic HTML data types and its elements.
- OOPWeb.com: HTML Directory
- Provides the specifications of HTML 4.01, XHTML 1.0 and CSS2 with a brief summary of the tool.
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