Some HTML5 test pages. Even though browser support is limited, this looks like a great update to the core language of the web. If none of these work, it is because you are either using an older browser or Internet Explorer.
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Kicking around with the CANVAS tag. Rectanges, text and arrows, oh my!
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Embedded video, two of them. No Flash or other plugins needed.
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An embedded MP3 file, using the video tag.
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Samples of some of the changes to forms. A few of these only work on mobile devices.