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It originally defined a very simple class of report-style documents, with section headings, paragraphs, lists, tables, and illustrations, and a few informational elements, but very few presentational elements (Flynn, 1995), plus some hypertext and multimedia. See the question on extending HTML.
The current W3C Recommendations are the XML version of HTML, XHTML; and the more mobile- and media-aware variant, HTML5. There is a separate HTML-and-XHTML FAQ maintained by Steven Pemberton at http://www.w3.org/MarkUp/2004/xhtml-faq