HTML is a markup language for hypertext which is understood by all WWW clients. Here we discuss the HTML language, i.e. its syntax and semantics, including information on the history of the language, status of the standard, and development issues.
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The specification is still being refined, mainly a question of defining its expression in terms of SGML, and accurately describing current accepted practice.
Features such as tables, figures, mathematical equations, and stylesheets are in development:
This is the level mandatory for all WWW clients. Level-1 is basically the HTML of the initial WWW clients, plus images. The level 1 spec is relatively old, so a better specification is to take the level 1 features from level 2, above. About level-1 there is:
Hypertext Markup Language (HTML) Tim Berners-Lee, CERN Internet Draft Daniel Connolly, Atrium IIIR Working Group June 1993