Sam Atkins a9a25d4eca Tests: Add a test for @supports ...

This is derived from our old demo page.

Notably, we currently do claim to support `::-webkit-foo` selectors,
which is a bug. According to the spec [1], we have to parse those as
valid, but `@supports` should still fail for them [2], which is a bit
confusing.

[1] https://www.w3.org/TR/selectors-4/#compat
[2] https://drafts.csswg.org/css-conditional-4/#support-definition-ext

2024-11-07 15:11:24 +01:00

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