[Gecko Bug 1664718] Allow :is() and :where() to have better error recovery. #25519
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Adjust is-where-parsing.html to work with both the new and old behavior,
and add a test for the new behavior.
Depends on D90049
Differential Revision: https://phabricator.services.mozilla.com/D90050
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1664718
gecko-commit: c8a8791a26edfcd8789b1c3163f87f3a46ec46eb
gecko-reviewers: xidorn