Load a PDF, and mouse down on a checkbox. It shows the gray highlight. Then drag the mouse off the checkbox; the highlight disappears. Then drag back over it; the highlight should re-appear, but does not.
rdar://123123950
Pull request: https://github.com/WebKit/WebKit/pull/25132
Committed 275362@main (e5936dcccb93): <https://commits.webkit.org/275362@main> Reviewed commits have been landed. Closing PR #25132 and removing active labels.