CSSContainerRule interface
Created attachment 456012 [details] Patch
Created attachment 456015 [details] Patch
Created attachment 456016 [details] Patch
Committed r292045 (248985@main): <https://commits.webkit.org/248985@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 456016 [details].
<rdar://problem/90994574>