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

I think the code that makes this work in Chromium is [this](https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/css/fullscreen.css;l=52-59;drc=17460926782b758f5cd86552221182bb9b188ce5):

```css
:root:-webkit-full-screen-ancestor {
  overflow: hidden !important;
}
```

`:-webkit-full-screen-document` was used previously, but changed in https://codereview.chromium.org/807473002.

Specifying this with `:has()` sounds reasonable, but I'm wondering why it shouldn't just be `overflow: hidden !important`? Would changing it to `overflow: hidden | clip !important` be observable in any way?

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