Re: [fullscreen] ::backdrop of root (#24)

I think all impls currently agree with the behavior that, when root goes fullscreen, it still has white background, while when body goes fullscreen, it just turns to the black background like other normal elements.

I suspect the current behavior is because we previously wrote the background in the `:not(:root):fullscreen` declaration? And thus I guess this behavior was unintentionally changed when we introduced `::backdrop`.

I suggest we just bring the current behavior all impls agree with back to the spec again.

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