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HTML 5 may not be finished yet, but it’s already transforming a wide variety of mobile web development tasks.
At the time of this writing, HTML 5 is a draft for the future standard for website markup. It will replace both XHTML 1.1 and HTML 4.0, adding new markup, deprecating some existing tags (like font and center), and adding some new JavaScript APIs. You can find the latest documentation at http://dev.w3.org/html5.