When work began on the next revision of HTML in 2004, experts predicted widespread adoption would take more than a decade. However, early adoption by browser publishers and service giants Google and Yahoo, among others, have enabled practical applications of HTML 5 in 2009. The design community is rushing to demonstrate that the new language can be used now.

HTML 5 replaces HTML 4.01 and XHTML 1. It supports rich applications through introduction of new elements and attributes; an extensive set of new behaviors comparable to Adobe flash and flex, Microsoft Silverlight, and others; offline storage; document editing; and many other application-enabling features. Another revolutionary aspect of HTML 5 is its greater semantic expressiveness, thereby enabling greater accessibility for users relying on assistive technology and automated machine agents.

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