Avoid doing event-related work for CSS transitions when no event listener is registered for these.
<rdar://107077986>
Pull request: https://github.com/WebKit/WebKit/pull/11961
Committed 262123@main (43ea8744bc60): <https://commits.webkit.org/262123@main> Reviewed commits have been landed. Closing PR #11961 and removing active labels.
*** Bug 254180 has been marked as a duplicate of this bug. ***