[css-anchor-position] Remove support for position-fallback property
position-fallback is no longer in the spec, has no effect in application
of position fallback, and position-try-options has replaced it.
Bug: 40279608
Change-Id: I21f6a3e51623e0580608ccf0891b42d73dcbfd3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5371763
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1273323}
diff --git a/css/css-anchor-position/position-fallback-basics.html b/css/css-anchor-position/position-fallback-basics.html
deleted file mode 100644
index bfeb921..0000000
--- a/css/css-anchor-position/position-fallback-basics.html
+++ /dev/null
@@ -1,40 +0,0 @@
-<!DOCTYPE html>
-<title>Tests basics of the 'position-fallback' property</title>
-<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#propdef-position-fallback">
-<link rel="author" href="mailto:xiaochengh@chromium.org">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/css/support/parsing-testcommon.js"></script>
-<script src="/css/support/computed-testcommon.js"></script>
-<script src="/css/support/inheritance-testcommon.js"></script>
-<script src="/css/support/interpolation-testcommon.js"></script>
-
-<div id="container">
- <div id="target"></div>
-</div>
-
-<script>
-// position-fallback: none | <dashed-ident>
-test_valid_value('position-fallback', 'none');
-test_valid_value('position-fallback', '--foo');
-test_invalid_value('position-fallback', 'foo-bar');
-test_invalid_value('position-fallback', '--foo --bar')
-test_invalid_value('position-fallback', '--foo, --bar')
-test_invalid_value('position-fallback', '100px');
-test_invalid_value('position-fallback', '100%');
-
-// Computed value: as specified
-test_computed_value('position-fallback', 'none');
-test_computed_value('position-fallback', '--foo');
-
-// Initial: none
-// Inherited: no
-assert_not_inherited('position-fallback', 'none', '--foo');
-
-// Animation type: discrete
-test_no_interpolation({
- property: 'position-fallback',
- from: '--foo',
- to: 'none',
-});
-</script>
