Load event never firing after form is submitted

[Sam Sneddon [:gsnedders]]

On the above test (note: this requires pop-ups to be allowed), the test is constantly resulting in a harness TIMEOUT.

The underlying cause of this seems to be us never actually firing the load event for the test document.

[Radar WebKit Bug Importer]

<rdar://problem/87831049>

[Sam Sneddon [:gsnedders]]

Reduces down to:

<div id=log></div>
<form action=about:blank target=_blank><input type=hidden name=input></form>
<script>
  const t1 = performance.now();
  const submitter = document.querySelector("form");
  submitter.submit();

  window.onload = () => {
    document.querySelector("#log").textContent = `loaded after ${performance.now() - t1}ms`;
    
  }
</script>

[Alexey Proskuryakov]

I looked through our other form submission bugs, but this one seems new.

[Chris Dumez]

I am investigating.

[Chris Dumez]

Created attachment 453849 [details]
WIP patch

[Chris Dumez]

Created attachment 453851 [details]
Patch

[Chris Dumez]

Created attachment 453857 [details]
Patch

[Geoffrey Garen]

Comment on attachment 453857 [details]
Patch

r=me

[EWS]

Committed r290841 (248077@main): <https://commits.webkit.org/248077@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 453857 [details].