Re: [whatwg/fullscreen] Clarify backdrop/filter/paint behavior for Fullscreen API (#165)

In case it helps, I experimented with Fullscreen API here: https://fullscreenblend.glitch.me/

Specifically, this includes a style rule that sets the fullscreen backdrop transparent, overriding the UA's "backdrop: black":

```css
:not(:root):fullscreen::backdrop {
    background-color: transparent;
}
```

This leads to odd effects in Chrome (I tested 80 and 82), where it appears that the backdrop filter in the fullscreen element unexpectedly applies to content that's supposed to be hidden by the backdrop. If I'm understanding it right, this means that the top layer isn't yet acting as a backdrop root?

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