[whatwg/fullscreen] How should UAs hide scrollbars? (Issue #236)

### What is the issue with the Fullscreen API Standard?

All existing UAs currently hide scrollbars when fullscreen, but they all do so in different ways:
- Chrome & Firefox I believe have special logic that prevents scrolling + hides scrollbars
- Safari has an `overflow: hidden !important` UA rule on `*|*:root:-webkit-full-screen-document:not(:fullscreen)`

I wonder if we can get a standardized way of doing this. Something like:

```
*|*:root:has(:fullscreen) {
    overflow: hidden | clip !important;
}
```

(UAs may not necessarily want to use :has() for performance reasons, but the idea would be something like Safari implements).

Also, not sure if clip or hidden is closer to the wanted behavior here, but I think I'd be OK with either.

cc @whatwg/css

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