Re: [csswg-drafts] [css-transforms-2] proposal new transform-style: detached (#4242)

I don't think `transform-style: preserve-3d` on the root today does anything, since the root implicitly flattens even if it has `preserve-3d` set, since there's no parent's 3-d scene to merge into.  So I don't think people would have a good reason to be using it today -- though that doesn't mean they aren't.  So then the next question would be how many are, and then what the tradeoff between extra complexity and that compatibility cost is.

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