Certain configurations of content layer incorrectly with <video> when accelerated compositing is enabled. This is fallout from bug 27021.
<rdar://problem/7186095>
Created attachment 39669 [details] Patch, testcase, changelog
Created attachment 39677 [details] Simpler patch
Comment on attachment 39677 [details] Simpler patch > + if (overlapMap && overlapMap->size()) { This is better expressed as !overlapMap.isEmpty()
http://trac.webkit.org/changeset/48470