Created attachment 71976 [details]
http://dev.sencha.com/animator/demos/healthy-choice/ shows problems when running with accelerated compositing; the second set of divs do not become visible at all.
The workaround is to explicitly specify opacity: 1 in keyframes that need it.
This probably regressed in r66339.
Created attachment 71983 [details]
Looks good to me.
Comment on attachment 71983 [details]
Removing ? until I figure out if I have to stuff the values into the first keyframe also.
Created attachment 72045 [details]
Attachment 72045 [details] did not pass style-queue:
Failed to run "['WebKitTools/Scripts/check-webkit-style']" exit_code: 1
WebCore/rendering/RenderLayerBacking.cpp:1121: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] 
Total errors found: 1 in 9 files
If any of these errors are false positives, please file a bug against check-webkit-style.
bool isFirstOrLastKeyframe = !key || key == 1; // per style check... ?
(In reply to comment #8)
> bool isFirstOrLastKeyframe = !key || key == 1; // per style check... ?
I think what I have is more readable. I am purposefully ignoring the style check.
Indeed. Good deal.
http://trac.webkit.org/changeset/70657 might have broken GTK Linux 32-bit Debug and Qt Linux Release
(In reply to comment #11)
> http://trac.webkit.org/changeset/70657 might have broken GTK Linux 32-bit Debug and Qt Linux Release
FYI: Qt specifix expected results landed in: http://trac.webkit.org/changeset
Please don't ignore commnts of sheriffbot! He usually tell the truth.