All that was changed was removal of a z-index: 0 from the media control styles. This caused 5 tests to start generating assertion failures deep in compositing code, which implies an error with that code somehow. After a bit of debugging I've decided that I have no idea where to even begin with compositing stuff. The tests failing are: compositing/regions/transform-transparent-positioned-video-inside-region.html compositing/regions/video-in-overflow-region.html fast/regions/fullscreen/full-screen-video-from-region.html fast/regions/fullscreen/full-screen-video-in-region-crash.html fast/regions/inline-block-inside-anonymous-overflow.html Though they pass in release. In addition I have not hit the assertion just browsing around various videos using our controls in debug. I will skip these tests for now.
<rdar://problem/20819825>
Simon is taking a look at these. Thanks Simon!
ASSERT(!layer.hasNotIsolatedCompositedBlendingDescendants() || layer.hasNotIsolatedBlendingDescendants());
Seems related to isolates blending, and regions.
Commented out assertion and unskipped tests here: http://trac.webkit.org/changeset/183843 Keeping bug open to keep track of the assertion being commented out.
Created attachment 253871 [details] Patch
Comment on attachment 253871 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=253871&action=review rs=me > Source/WebCore/ChangeLog:9 > + escape the media elements, which was fixed in r145420. This is probably bug 145420, not r145420.
https://trac.webkit.org/r184992