Sam Atkins b6032b0fcd LibWeb/CSS: Reimplement var()/attr() as arbitrary substitution functions ...

"Arbitrary substitution functions" are a family of functions that
includes var() and attr(). All of them resolve to an arbitrary set of
component values that are not known at parse-time, so they have to be
substituted at computed-value time.

Besides it being nice to follow the spec closely, this means we'll be
able to implement the others (such as `if()` and `inherit()`) more
easily.

The main omission here is the new "spread syntax", which can be
implemented in the future.

2025-07-09 16:44:20 +01:00

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