Bug 310040 – inherit on descendants of composited animations never updates

• Component: Animations
• Status: NEW

[Robert Flack]

Created attachment 478699 [details]
Test case showing a transform value from an active animation inherited.

Open the attached file or navigate to https://jsbin.com/zoloqaf/4/edit?html,css,output , click the animate checkbox to start the animation.

Actual results:

During the animation the #b element never updates its own transform.

Expected results:

During the animation, the #b element should smoothly translate twice as far up and down as the #a element as it is shifted by #a's transform plus an identical transform on itself. You can see before the animation is running that b is offset both by a's transform and its own inherited transform matching a.

In firefox https://bugzilla.mozilla.org/show_bug.cgi?id=2023700 and chrome https://issues.chromium.org/493257009 the #b element updates when the mouse is moved.

[Karl Dubost]

Thanks Robert.
This is not working anywhere properly.
The animations have sometimes erratic jumps when activated, and doesn't seem to end up in always the same place. 
Thanks for the useful test case.

[Radar WebKit Bug Importer]

<rdar://problem/173175142>