Dive into HTML 5

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Dive into HTML5 by Mark Pilgrim details hand-picked selection of features from the HTML 5 specification and other standards. It starts with an introduction about HTML 5, whats new, how it affects your existing HTML files, details about new elements like canvas, video, offline caching etc. All of these in a very concise and easy to understand format.

You can also buy the book on HTML 5 by Mark Pilgrim.