Adding the <source> Tag

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<video poster="#" width="..." height="..." preload controls >
<source src="#" type="" / >
</video>

You can use multiple source elements, which specifies to the browser the video is available in multiple formats. This is the <source /> element, and again, it is used instead of the src="" attribute of a <video> element.

NOTE: Due to a bug on the iPad, you should provide the MP4 video as the first format.