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

One thing that came up while fixing tests were tests that were doing:

```
dialog { visibility: hidden }
```

And expecting the backdrop to render. I don't expect that to come up in practice, but if such thing became a backwards-compatibility issue, we'd need to do something like adding this to the HTML style sheet:

```
dialog::backdrop { visibility: visible }
```

Again, I don't think we should do this unless required by compat.

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