Created attachment 43398 [details] Testcase In the attached testcase, the animating elements should drop out of compositing layers when the animation finishes. However, they don't.
<rdar://problem/7402913>
This seems to happen because the 'mustOverlapCompositedLayers' flag gets stuck on the layer that was animated.
Created attachment 43403 [details] Patch
http://trac.webkit.org/changeset/51112