Gecko sync update

Author: moz-wptsync-bot

css/css-values/META.yml

@@ -1934,4 +1934,8 @@ links:
   - subtest: 'CSS Values and Units Test: if() style() condition invalidation'
     test: if-style-invalidation.html
   url: https://bugzilla.mozilla.org/show_bug.cgi?id=1950681
-
+- product: firefox
+  results:
+  - subtest: sibling-index() and sibling-count() evaluate as normal from inner tree
+    test: tree-scoped-sibling-function.tentative.html
+  url: https://bugzilla.mozilla.org/show_bug.cgi?id=1952899