diff --git a/css-layout-api/Overview.bs b/css-layout-api/Overview.bs
index 5ab942f3..eda70a1e 100644
--- a/css-layout-api/Overview.bs
+++ b/css-layout-api/Overview.bs
@@ -1369,7 +1369,7 @@ which are related to layout.
 The {{layoutWorklet}}'s <a>worklet global scope type</a> is {{LayoutWorkletGlobalScope}}.
 
 <pre class='idl'>
-partial interface CSS {
+partial namespace CSS {
     [SameObject] readonly attribute Worklet layoutWorklet;
 };
 </pre>
diff --git a/css-paint-api/Overview.bs b/css-paint-api/Overview.bs
index befd96b4..d1e22a70 100644
--- a/css-paint-api/Overview.bs
+++ b/css-paint-api/Overview.bs
@@ -90,7 +90,7 @@ which are related to painting.
 The {{paintWorklet}}'s <a>worklet global scope type</a> is {{PaintWorkletGlobalScope}}.
 
 <pre class='idl'>
-partial interface CSS {
+partial namespace CSS {
     [SameObject] readonly attribute Worklet paintWorklet;
 };
 </pre>
diff --git a/css-properties-values-api/Overview.bs b/css-properties-values-api/Overview.bs
index d9d7289f..60630194 100644
--- a/css-properties-values-api/Overview.bs
+++ b/css-properties-values-api/Overview.bs
@@ -72,8 +72,8 @@ dictionary PropertyDescriptor {
 	         DOMString initialValue;
 };
 
-partial interface CSS {
-	static void registerProperty(PropertyDescriptor descriptor);
+partial namespace CSS {
+	void registerProperty(PropertyDescriptor descriptor);
 };
 </pre>