[Gecko Bug 1723921] Throw on invalid pseudo-elements in getComputedStyle() as per spec. #29941
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I need to update tests, try incoming.
Depends on D121705
Differential Revision: https://phabricator.services.mozilla.com/D121706
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1723921
gecko-commit: d9d140e0e045ab813e1984fc37a1a198e6e04728
gecko-reviewers: dholbert, layout-reviewers