This function incorrectly uses the term "containingBlock" without first determining the formatting context it is in. It should first determine the formatting context and then use either "formattingContextRoot" or the correct name of the formatting context root (e.g. flexbox/grid)
<rdar://problem/107726833>
Pull request: https://github.com/WebKit/WebKit/pull/13284
Committed 263616@main (69af735e2796): <https://commits.webkit.org/263616@main> Reviewed commits have been landed. Closing PR #13284 and removing active labels.