[Gecko Bug 1200896] Make the document blocked by the topmost element in the top layer #24939
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Spec: https://html.spec.whatwg.org/multipage/#blocked-by-a-modal-dialog
Differential Revision: https://phabricator.services.mozilla.com/D86227
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1200896
gecko-commit: c7ae88fd1bd7e1d7d6d622eaa37439b653dc13d2
gecko-integration-branch: autoland
gecko-reviewers: emilio