It just needs the root container. This will allow more flexibility in layout box building and ownership.
Created attachment 388146 [details] patch
Created attachment 388148 [details] patch
Created attachment 388149 [details] patch
Comment on attachment 388149 [details] patch Clearing flags on attachment: 388149 Committed r254797: <https://trac.webkit.org/changeset/254797>
All reviewed patches have been landed. Closing bug.
<rdar://problem/58711195>