--- a/testing/web-platform/tests/interfaces/html.idl
+++ b/testing/web-platform/tests/interfaces/html.idl
@@ -1161,19 +1161,20 @@ interface SubmitEvent : Event {
 
   readonly attribute HTMLElement? submitter;
 };
 
 dictionary SubmitEventInit : EventInit {
   HTMLElement? submitter = null;
 };
 
-[Exposed=Window,
- Constructor(DOMString type, optional FormDataEventInit eventInitDict = {})]
+[Exposed=Window]
 interface FormDataEvent : Event {
+  constructor(DOMString type, FormDataEventInit eventInitDict);
+
   readonly attribute FormData formData;
 };
 
 dictionary FormDataEventInit : EventInit {
   required FormData formData;
 };
 
 [Exposed=Window]
@@ -2006,18 +2007,18 @@ partial interface mixin NavigatorID {
 };
 
 interface mixin NavigatorLanguage {
   readonly attribute DOMString language;
   readonly attribute FrozenArray<DOMString> languages;
 };
 
 interface mixin NavigatorContentUtils {
-  void registerProtocolHandler(DOMString scheme, USVString url, DOMString title);
-  void unregisterProtocolHandler(DOMString scheme, USVString url);
+  [SecureContext] void registerProtocolHandler(DOMString scheme, USVString url, DOMString title);
+  [SecureContext] void unregisterProtocolHandler(DOMString scheme, USVString url);
 };
 
 interface mixin NavigatorCookies {
   readonly attribute boolean cookieEnabled;
 };
 
 interface mixin NavigatorPlugins {
   [SameObject] readonly attribute PluginArray plugins;