[@container] Make sure style(--prop: revert) parses but fail matching
Modify tests to not pass for missing implementation. In particular,
modify expectation that style(--prop: revert) does not fail parsing, but
fail evaluation.
Change-Id: I448c07e9cb857d5f9835cdded11c9eae3ee4aba6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5800693
Reviewed-by: Anders Hartvoll Ruud andruud@chromium.org
Commit-Queue: Rune Lillesveen futhark@chromium.org
Cr-Commit-Position: refs/heads/main@{#1345292}