PopState event should be fired synchronously, even before the load event. We used to delay PopState events until the load event has fired but this doesn't match other Blink or Gecko.
Pull request: https://github.com/WebKit/WebKit/pull/4324
Committed 254519@main (9497f1badb3d): <https://commits.webkit.org/254519@main> Reviewed commits have been landed. Closing PR #4324 and removing active labels.
<rdar://problem/99975617>