See the test-case at https://bugzilla.mozilla.org/attachment.cgi?id=8972799 / https://github.com/w3c/csswg-drafts/issues/3101. The iframe resize should be properly reflected in MediaQueryList.matches.
Firefox and Safari continue to fail this test case.
(Chrome passes)
<rdar://problem/97091396>
Pull request: https://github.com/WebKit/WebKit/pull/3003
Committed 253123@main (e66751caa5cc): <https://commits.webkit.org/253123@main> Reviewed commits have been landed. Closing PR #3003 and removing active labels.