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

We should just say that ::backdrop inherits custom properties from its originating element, even if we explicitly block all other inheritance.

(This *should* be doable in pure CSS by saying that `::backdrop { all: initial; --: inherit; }` applies at the UA stylesheet level; this blocks all inheritance of normal properties, but lets custom properties thru. Unfortunately I haven't defined the `--` property yet. :(

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