[css-anchor-position] Allow anchor-size() for insets and margins
Per resolution in [1]
Added tests for actually checking that anchor-size() function does
apply to margins and insets.
[1] w3c/csswg-drafts#9827 (comment)
Bug: 346521300
Change-Id: I1d47feb6d4a3bd41c8860c3a5982025ee18fe0c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5916307
Reviewed-by: Mason Freed masonf@chromium.org
Commit-Queue: Rune Lillesveen futhark@chromium.org
Cr-Commit-Position: refs/heads/main@{#1366397}