tree 962c15362fa923a5b2d20412aa0e1f2c0a12a986
parent 5bdff978e0eb2c2af1f142c8b51592eea151b492
author Rune Lillesveen <futhark@chromium.org> 1669324757 -0800
committer Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> 1669326957 -0800

Make position-fallback a tree-scoped name/reference

In preparation for doing tree-scoped name lookup for @position-fallback
rules. Also added tests for tree-scoped @position-fallback lookups.

Bug: 1381623
Change-Id: I6f9dc5ecaac2773c8deff9b9f6c66f389eb5e977
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4055466
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1075628}