and stop using InitialContainingBlock
Created attachment 441047 [details] Patch
Created attachment 441048 [details] Patch
Created attachment 441051 [details] Patch
Created attachment 441057 [details] Patch
Committed r284107 (242932@main): <https://commits.webkit.org/242932@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 441057 [details].
<rdar://problem/84206584>