Part 6 - Adjust test expectations.

Differential Revision: https://phabricator.services.mozilla.com/D228243

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1915021
gecko-commit: 26cdabcaa8fb2026b274bec094b498b4c895813a
gecko-reviewers: jwatt

css/css-anchor-position/anchor-parse-valid.html

@@ -70,7 +70,9 @@
 }
 
 // Tests that anchor() can be used in a calc tree
-test_valid_value('top', 'calc((anchor(--foo top) + anchor(--bar bottom)) / 2)');
-test_valid_value('top', 'anchor(--foo top, calc(anchor(--bar bottom) * 0.5))');
+// Still follow the simplification process as outlined in https://drafts.csswg.org/css-values-4/#calc-simplification
+test_valid_value('top', 'calc((anchor(--foo top) + anchor(--bar bottom)) / 2)', 'calc(0.5 * (anchor(--foo top) + anchor(--bar bottom)))');
+test_valid_value('top', 'calc(0.5 * (anchor(--foo top) + anchor(--bar bottom)))');
+test_valid_value('top', 'anchor(--foo top, calc(0.5 * anchor(--bar bottom)))');
 test_valid_value('top', 'min(100px, 10%, anchor(--foo top), anchor(--bar bottom))');
 </script>