SSIA It seems to be unused and don't have any use cases in HTML Editing test case. Just raising, so I can try to remove and see if there is anything which touches it or leads to any test case failures. Thanks!
PR - https://github.com/WebKit/WebKit/pull/22229
Committed 272487@main (38330fe01ce2): <https://commits.webkit.org/272487@main> Reviewed commits have been landed. Closing PR #22229 and removing active labels.
<rdar://problem/120089268>