In this example the animation and effects aren't using javascript, the javascript is just is just firing the events. CSS3 (as implemented here) can leverage the

In this example the animation and effects aren't using javascript, the javascript is just is just firing the events. CSS3 (as implemented here) can leverage the same general advantages as a native app (GPU acceleration, etc). It's still early days, so browsers are various levels of implementation support, but the point is that moving forward it's not crippled by the same limitations of javascript DOM manipulation; vendors can actually optimize the software and hardware support. I'd say it's quite likely animation and graphics in the browser (not specifically javascript) WILL be good.