No other browser supports anything like this, and we don't even have
internal uses of this pseudo-class.
Only uses of this I've found on the wild were just resetting the box
shadow internal styling we added in bug 582277 (and since removed in bug
600151).
I plan to put this behind a (default-off) pref in bug 1694129, but let
me know if there's any objection to this.
Cheers,
-- Emilio
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