Sam Atkins 6ae2b8c3d9 LibWeb/CSS: Parse custom-idents more consistently ...

These have a few rules that we didn't follow in most cases:
- CSS-wide keywords are not allowed. (inherit, initial, etc)
- `default` is not allowed.
- The above and any other disallowed identifiers must be tested
  case-insensitively.

This introduces a `parse_custom_ident_value()` method, which takes a
list of disallowed identifier names, and handles the above rules.

2024-07-27 14:45:33 +02:00

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