Sam Atkins 1c4a05f8a4 LibWeb: Treat "revert" as a CSS-wide keyword ...

This isn't included in the base definition of a CSS-wide keyword, but
the CASCADE-4 spec which adds it says:

> The revert CSS-wide keyword rolls back the cascade to the cascaded
  value of the earlier origin.

So it is one. While I'm at it, rename `is_builtin()` to match the spec
terminology. It's not used currently, but will be in the next commit.

2023-09-25 00:46:21 +01:00

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