Re: [whatwg/fullscreen] Impossible to customize the style of a dialog's ::backdrop residing inside a Shadow DOM. (#124)

How an element/pseudo-element is rendered has no effect on where it inherits from. It's only a question of where is the element/pseudo-element logically located in the DOM tree.

e.g., `::before` is assumed to be placed at the very beginning inside its originating element, so it inherits from the originating element. But you can always make it cover the whole viewport like `::backdrop` via giving it some proper styles like `position: fixed; top: 0; right: 0; bottom: 0; left: 0;`.

In the `::backdrop` case, I think the difficulty is that there is no logical location in DOM tree to place this pseudo-element. Having said that, I realized that there might be some inconsistency if we have it inherit from the originating element, because `::backdrop` is not supposed to be a child of the element at all. But it's probably not a big problem, since top layer would make the pseudo-element escape from any containing block so it doesn't matter whether it is a children of anything in terms of rendering...

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