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

```
dialog::backdrop {
  background-color: blue;
}
```

and 

```

::backdrop {
  --bg-color: blue;
}

dialog::backdrop {
  background-color: var(--bg-color);
}

```
appear to render expected result at Chromium.

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