Andreas Kling 8f29bdb62c LibWeb: Implement the CSS revert keyword ...

This is a universal value like `initial` and `inherit` and works by
reverting the current value to whatever we had at the start of the
current cascade origin.

The implementation is somewhat inefficient as we make a copy of all
current values at the start of each origin. I'm sure we can come up with
a way to make this faster eventually.

2023-07-29 19:16:08 +02:00

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