Is it possible in html5 output of audio and video to have multiple
sources and fallback?
I'm thinking specifically of for example:
<video>
<source src="video.ogg" type="video/ogg" />
<source src="video.mp4" type="video/mp4" />
<source src="video.webm" type=" video/webm">
</video>
Fixed in 5.1, we allow multiple videodata elements.