Created attachment 66498 [details]
a little bit of simple HTML which can be used to demonstrate the problem
The bug is simple: the animation ignores 'inset' until it is complete. The inset shadow appears outside the element until the animation is complete. At that point, the shadow suddenly switches to appear inside the element.
Please note that I am not an expert at this stuff and I have not checked the rest of the animations. This bug may require some further discussion?
Tested on Chrome canary build (nightly) 3-sept-2010
It's not clear to me what to do when animating between different shadow styles (inset vs. non-inset).
Created attachment 89154 [details]