This was added in https://bugs.webkit.org/show_bug.cgi?id=124561, but isn't by any assistive technology anymore. We should remove it.
<rdar://problem/118546456>
Created attachment 468638 [details] Patch
Committed 270872@main (114aa2c85948): <https://commits.webkit.org/270872@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 468638 [details].