document.open() should remove the initial about:blank-ness of the document. This aligns our behavior with Firefox and Chrome.
Pull request: https://github.com/WebKit/WebKit/pull/4546
Committed 254747@main (dc6d5ef7e624): <https://commits.webkit.org/254747@main> Reviewed commits have been landed. Closing PR #4546 and removing active labels.
<rdar://problem/100255101>