(In reply to Brecht Machie from comment #2) > this is a Mac-specific issue. It doesn't work not only in contenteditable in shadow root, the it dones't work in light dom and browser (e.g. URL bar, search bar ..), either. See https://bugzilla.mozilla.org/show_bug.cgi?id=1539376.
Bug 1623583 Comment 5 Edit History
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(In reply to Brecht Machie from comment #2) > this is a Mac-specific issue. It doesn't work not only in contenteditable in shadow root, the it dones't work in light dom and browser UI (e.g. URL bar, search bar ..), either. See https://bugzilla.mozilla.org/show_bug.cgi?id=1539376.