rdar://57073673 This causes occasional null-pointer crashes when currentStyle() gets called on the CSSTransition before resolve.
Created attachment 387141 [details] Patch
Created attachment 389404 [details] Patch
Created attachment 389436 [details] Patch
Comment on attachment 389436 [details] Patch Clearing flags on attachment: 389436 Committed r256427: <https://trac.webkit.org/changeset/256427>
All reviewed patches have been landed. Closing bug.