diff --git a/css/selectors/WEB_FEATURES.yml b/css/selectors/WEB_FEATURES.yml
index 93f442f8d7fbf2..aa9419746e6ba4 100644
--- a/css/selectors/WEB_FEATURES.yml
+++ b/css/selectors/WEB_FEATURES.yml
@@ -90,3 +90,8 @@ features:
 - name: selection
   files:
   - selection-image-001.html
+- name: form-validity-pseudos
+  files:
+  - valid-invalid-form-fieldset.html
+  - selector-required.html
+  - selector-required-type-change-*
diff --git a/html/semantics/selectors/pseudo-classes/WEB_FEATURES.yml b/html/semantics/selectors/pseudo-classes/WEB_FEATURES.yml
index c3855d6d7304aa..9452b07fad7a8e 100644
--- a/html/semantics/selectors/pseudo-classes/WEB_FEATURES.yml
+++ b/html/semantics/selectors/pseudo-classes/WEB_FEATURES.yml
@@ -18,3 +18,12 @@ features:
   files:
   - readwrite-readonly-type-change.html
   - readwrite-readonly.html
+- name: form-validity-pseudos
+  files:
+  - valid-invalid.html
+  - valid-invalid-fieldset-disconnected.html
+  - invalid-after-clone.html
+  - required-optional.html
+  - required-optional-hidden.html
+  - inrange-outofrange.html
+  - inrange-outofrange-type-change.html