It wouldn't have passed anyway - the final frame has to be exactly like the reference, and the animation to get there has to be "smooth".
Webkit got to 100/100 (until "smooth" is defined it's hard to tell if it actually passes, all hail the crap test) as well, and they have a public build out that'll do it.
Is that webkit on the mac? If so I'd disqualify it for using hidden, undocumented OS features that are not available to other developers...