Validation message should be positioned as a part of update-the-rendering steps instead of a post layout task.
Pull request: https://github.com/WebKit/WebKit/pull/13433
Committed 263663@main (987db2a04859): <https://commits.webkit.org/263663@main> Reviewed commits have been landed. Closing PR #13433 and removing active labels.
<rdar://problem/108877950>