Today we would like to announce that WebKit is the first browser engine to fully pass Acid3. A while back, we posted that we scored 100/100 and matched the reference rendering. Now, thanks to recent speedups in JavaScript, DOM and rendering, we have passed the third condition, smooth animation on reference hardware.

Here is a screenshot of a successful run:

Here is the timing reference dialog you get by clicking on the “A” in Acid3 that confirms we pass the smooth animation condition on a 2.4GHz MacBook Pro:

To try it for yourself, grab a nightly. Keep in mind that on slower machines, the timing may not be perfect, and you need to do a cached run of the test (load it once, close window, open new window, load it again) to avoid delays from the network.