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

Think of Web components (aka custom elements). An element that wraps a `dialog` is added to the DOM. The element along with its `::backdrop` are rendered when `showModal()` is called. For example see [here](https://freshp86.github.io/chromium-webui/demo.html) (which is a copy of actual code from Chromium).

As a developer, a custom element is though of as a black box with a public API. Having to treat the `::backdrop` as anything other than a child of the custom element is inconvenient, and I don't think is the suggested route anyway. FWIW `dialog::backdrop` is already a thing, so I don't think arguing whether the existence of it is justified as opposed to just having a global `::backdrop` needs to be had in this discussion.




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