The spec currently says that queried values must be computed in the context of the container, so I assume things like style(left: 1em) and style(left: var(--x)) should work. But the spec does not say anything about CSS-wide keywords, and I think they should be explicitly disallowed.

In particular, satisfying revert and revert-layer would require cascading-information that is long gone by the time we reach the descendant affected by the query.