Sam Atkins b1f8a73a05 LibWeb: Parse CSS Supports ...

... according to
https://www.w3.org/TR/css-conditional-3/#typedef-supports-condition

This works very similarly to `@media`, but is different enough to
require its own parsing. (Though, the draft of Conditional-4 currently
mentions combining the two into a `@when` rule.)

Made some small changes to parsing code to make this work. Notably,
making `consume_a_declaration()` fail gracefully instead of
`VERIFY()`ing.

2021-10-08 23:02:57 +02:00

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