Sam Atkins 5b0187477b LibWeb: Implement :nth-[last-]child(n of foo) syntax ...

In Selectors level 4, `:nth-child()` and `:nth-last-child()` can both
optionally take a selector-list argument. This selector-list acts as a
filter, so that only elements matching the list are counted. For
example, this means that the following are equivalent:

```css
:nth-child(2n+1 of p) {}
p:nth-of-type(2n+1) {}
```

2022-03-18 11:34:02 +01:00

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