It's every established. Go build even a basic list with a slide transition, wrap it in Phonegap, and deploy it to an HTC device from the last year running Android 2.3. It won't work well on 90% of the smartphones out there. Simply put, even the latest devices struggle with basic CSS animations/transitions.
Hell, scrolling isn't even smooth on most devices for even a fairly simple DOM.
You misunderstood my point -- I was not talking about the current situation, but what today's devices will be capable of with software from a year in the future.
Even now, I believe Mobile Firefox is much faster than the stock webkit browser for javascript processing.
Hell, scrolling isn't even smooth on most devices for even a fairly simple DOM.