1 files changed, 3 insertions, 3 deletions
diff --git a/testing/web-platform/tests/interfaces/trusted-types.idl b/testing/web-platform/tests/interfaces/trusted-types.idl
index db5bd635cf..a0f88e4e6c 100644
--- a/testing/web-platform/tests/interfaces/trusted-types.idl
+++ b/testing/web-platform/tests/interfaces/trusted-types.idl
@@ -32,12 +32,12 @@ interface TrustedScriptURL {
     DOMString? getAttributeType(
         DOMString tagName,
         DOMString attribute,
-        optional DOMString elementNs = "",
-        optional DOMString attrNs = "");
+        optional DOMString? elementNs = "",
+        optional DOMString? attrNs = "");
     DOMString? getPropertyType(
         DOMString tagName,
         DOMString property,
-        optional DOMString elementNs = "");
+        optional DOMString? elementNs = "");
     readonly attribute TrustedTypePolicy? defaultPolicy;
 };