Re: [fullscreen] Propose to always render elements in the top layer as if it is fixed positioned (#19)

Yeah, I see that's for `<dialog>`. But I don't understand why `<dialog>` needs that setup.

As I mentioned above, top layer should be rendered on top of the scrollbar, which means the `::backdrop` of `<dialog>` should effectively block user from reaching the scrollbar. Given that, how does it make sense to have absolute position?

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