I talked with Emilio and Zibi and it's basically unclear, but it probably would not break anything if we disabled this inside shadow trees. So I suggest we do that and only make that work once there's a design as that is how we approach integration of most features with shadow trees. Axel, I see you're already copied, if you feel strongly in the other direction for some reason please so and we can reconsider.
Bug 1555947 Comment 5 Edit History
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I talked with Emilio and Zibi and it's basically unclear, but it probably would not break anything if we disabled this inside shadow trees. So I suggest we do that and only make that work once there's a design as that is how we approach integration of most features with shadow trees. Axel, I see you're already copied, if you feel strongly in the other direction for some reason please say so and we can reconsider.