Ask HN: Can you write high quality mobile apps in HTML5 yet?

I wrote a not-particularly successful, but well reviewed, iPhone game.

I am considering writing a sequel, for iOS, Android and the web, and the obvious way to do this would be via HTML5.

I have heard the odd horror story about HTML5 apps doing very badly, and having to be rewritten, but such apps are often GUI-intensive, whereas my game it much simpler (think chess).

Has anyone released any successful HTML5 games, on Android and iOS? Any advice?