Re: [csswg-drafts] [selectors4] Name the “functional pseudo-class like :matches() with 0 specificity”

Hmm, what about `:foreach`? It basically takes an array of arguments and for each item performs some operation, without affecting anything, similar to the `forEach` array method in JS.

So if with JS we would write:
```javascript
['.a', '.b', '.c'].forEach(item => doSomething(item + ' el'));
```
In CSS it would become:
```css
:foreach(.a,.b,.c) el {
  // doSomething
}
```

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