Did you know about Tizen and Firefox OS which use HTML5 as native language?
Yeah, I know about them. The problem is that they don't work on actual platform, and they have a long way to go to provide native features access.
Firefox OS is going to catch on mobile some time in the next few years, but no handset maker is going to have a prominent device with it, in the western world at least. Tizen is a great project, but nobody knows about it.