It is the third layer of the layer cake of standard web technologies, two of which (HTML and CSS) we have covered in much more detail in HTML5 and CSS3 courses here at Progra Training.
HTML 5 was adopted by the new working group of the World Wide Web Consortium (W3C) in 2007. This group published the first public draft of HTML 5 in January 2008. As of now, HTML5 is in the "Call for Review" state, and the W3C expects that it will reach its final state by the end of 2014.
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