[Gecko Bug 1936113] Add a couple of reftests for the :open pseudo-class. #50135
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Differential Revision: https://phabricator.services.mozilla.com/D234331
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1936113
gecko-commit: a88e93dff61448b7fcae3e4172830df7b2f3e508
gecko-reviewers: dshin