Re: [whatwg/dom] Element.matches and :scope (Issue #1081)

Well actually, I didn't find any subject or topic asking for a `.matches` with the possibility to specify a `:scope`. It seems that the `:scope` selector is not used frequently, after a few searches on github, stackoverflow or google.

A workaround exists:

```ts
const childNode = parentNode.querySelector(':scope > *');
childNode.matches('* > :scope'); // true => works !
```

However, it has 2 drawbacks:
- it's not easy to algorithmically convert a  `querySelector` into a `matches` because we have to parse the css selector and revert it.
- and (only from my point of view) it could be confusing for new incomers: the selector for `querySelector` and `matches` could be the same and match in most cases, but it won't for `:scope`

But as you said, it requires some community approval, requirement and/or interest. Maybe I'm the only one to find interest in it.


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