diff --git a/css/selectors/WEB_FEATURES.yml b/css/selectors/WEB_FEATURES.yml
index 2f2618e5d3dcb1..8eca551c0c255c 100644
--- a/css/selectors/WEB_FEATURES.yml
+++ b/css/selectors/WEB_FEATURES.yml
@@ -62,6 +62,9 @@ features:
   - hover-002.html
   - remove-hovered-element.html
   - focus-display-none-001.html
+- name: root
+  files:
+  - root-siblings.html
 - name: open-pseudo
   files:
   - open-pseudo.html
diff --git a/css/selectors/old-tests/WEB_FEATURES.yml b/css/selectors/old-tests/WEB_FEATURES.yml
index f7feb70f85a138..bf9d5e856e126c 100644
--- a/css/selectors/old-tests/WEB_FEATURES.yml
+++ b/css/selectors/old-tests/WEB_FEATURES.yml
@@ -3,6 +3,12 @@ features:
   files:
   - "css3-modsel-21*"
   - "css3-modsel-66*"
+- name: root
+  files:
+  - css3-modsel-27.xml
+  - css3-modsel-27a.xml
+  - css3-modsel-72.xml
+  - css3-modsel-72b.xml
 - name: lang
   files:
   - "css3-modsel-22.xml"