I've been around stackoverflow pages, i found a mature framework http://logicking.com/index.php?page=html5 they called it ultimate.js, i tried to play this game on my iPod touch 4, the performance and device behavior is... wow.
Develop games in your browser. Powerful, performant & highly capable.
Their site says they use directCanvas and CocoonJS. Those are the same two technologies we're working on for Construct 2. Hopefully they will be ready soon!
Cool i can't wait!