Sam Atkins 5319e2ba8e LibWeb: Parse forgiving selector-lists ...

`<forgiving-selector-list>` and `<forgiving-relative-selector-list>` are
the same as regular selector-lists, except that an invalid selector
does not make the whole list invalid. The former is used by the `:is()`
pseudo-class.

For example:

```css
/* This entire selector-list is invalid */
.foo, .bar, !?invalid { }

/* This is valid, but the "!?invalid" selector is removed */
:is(.foo, .bar, !?invalid) { }
```

Also as part of this, I've removed the `parse_a_selector(TokenStream)`
and `parse_a_relative_selector(TokenStream)` methods as they don't add
anything useful.

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

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