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

I agree with @upsuper’s comments. Pseudo-elements generally inherit from there originating element, and since they don't contain any text or other content, it seems unlikely that there's a Web-compat reason for `::backdrop` not to do so as well. (If there is, we can take @tabatkins approach of setting `::backdrop { all: initial; }` in the UA stylesheet.)

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