Note. Whereas there is more room to maneuver with desktop browsers, with mobile devices, speed and battery life are of prime concern. Since currently most, if not all mobile devices that play video, support H.264 decoding directly via hardware, it would be difficult to enter the market with a mobile OS that didn't support H.264.Broadway.js
for MP3 playback and ALAC.js
for lossless playback.
I encourage you to expand their tweets to see who else has chimed in. You can see the full discussion here