[Gecko Bug 1741936] Implement focus delegate algorithm #36449
Merged
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Spec: https://html.spec.whatwg.org/multipage/interaction.html#focus-delegate
Differential Revision: https://phabricator.services.mozilla.com/D153689
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1741936
gecko-commit: d0e9dd86db7355ba5bf4d2faebcdad8e4f3d41f5
gecko-reviewers: emilio