Basically, IE doesn't support it now, and may not in IE 10. Other browsers support it with very recent releases, but the API was only proposed in the W3C 4 months ago. Actually using this would therefore be fairly difficult and problematic, so it's probably premature to do so. The C9 devs would have to speak up here about this topic, but I wouldn't blame them for not implementing this feature at this time.
It's not C9 that I'm mad at. They are doing what they can with what they have. It's WinDiv that is blowing it with excluding a streaming media player in Metro IE 10 that can play flash and SL video full screen before the web has caught up with the capabilities these technologies have. Thankfully C9 made a nice W8 metro app that can render the streams full screen.
Metro IE 10 supports full screen since the webpage is fullscreen. No api needed for that. All browsing should be just fullscreen
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