Attached test case broke at http://trac.webkit.org/changeset/204052
Created attachment 288465 [details] Testcase
<rdar://problem/28235597>
<rdar://problem/28235602>
Nothing to do with transforms; the test case is animating top/left.
Yeah, this is about a shorthand and subsequent longhands not working properly. It's a dup of bug 160478 I think.
*** This bug has been marked as a duplicate of bug 160478 ***