diff --git a/ed/idl/trusted-types.idl b/ed/idl/trusted-types.idl
index b789485dfe32..33f5c35377ad 100644
--- a/ed/idl/trusted-types.idl
+++ b/ed/idl/trusted-types.idl
@@ -60,31 +60,31 @@ typedef [StringContext=TrustedScript] DOMString ScriptString;
 typedef [StringContext=TrustedScriptURL] USVString ScriptURLString;
 typedef (TrustedHTML or TrustedScript or TrustedScriptURL) TrustedType;
 
-partial interface mixin Window {
+partial interface Window {
   [SecureContext] readonly attribute TrustedTypePolicyFactory trustedTypes;
 };
 
-partial interface mixin Document {
+partial interface Document {
   [CEReactions] void write(HTMLString... text);
   [CEReactions] void writeln(HTMLString... text);
 };
 
-partial interface mixin HTMLScriptElement : HTMLElement {
+partial interface HTMLScriptElement {
  [CEReactions] attribute [TreatNullAs=EmptyString] ScriptString innerText;
  [CEReactions] attribute ScriptString? textContent;
  [CEReactions] attribute ScriptURLString src;
  [CEReactions] attribute ScriptString text;
 };
 
-partial interface mixin HTMLIFrameElement : HTMLElement {
+partial interface HTMLIFrameElement {
   [CEReactions] attribute HTMLString srcdoc;
 };
 
-partial interface HTMLEmbedElement : HTMLElement {
+partial interface HTMLEmbedElement {
   [CEReactions] attribute ScriptURLString src;
 };
 
-partial interface HTMLObjectElement : HTMLElement {
+partial interface HTMLObjectElement {
   [CEReactions] attribute ScriptURLString data;
   [CEReactions] attribute ScriptURLString codeBase; // obsolete
 };
@@ -97,27 +97,27 @@ partial interface mixin WindowOrWorkerGlobalScope {
 };
 
 [Exposed=(Window,Worker)]
-partial interface Worker : EventTarget {
+partial interface Worker {
     constructor(ScriptURLString scriptURL, optional WorkerOptions options = {});
 };
 
 [Exposed=(Window,Worker)]
-partial interface SharedWorker : EventTarget {
+partial interface SharedWorker {
   constructor(ScriptURLString scriptURL, optional (DOMString or WorkerOptions) options = {});
 };
 
 [Exposed=Worker]
-partial interface WorkerGlobalScope : EventTarget {
+partial interface WorkerGlobalScope {
   void importScripts(ScriptURLString... urls);
 };
 
 [SecureContext, Exposed=(Window,Worker)]
-partial interface ServiceWorkerContainer : EventTarget {
+partial interface ServiceWorkerContainer {
    [NewObject] Promise<ServiceWorkerRegistration> register(ScriptURLString scriptURL, optional RegistrationOptions options = {});
 };
 
 [Exposed=Window]
-partial interface mixin SVGAnimatedString {
+partial interface SVGAnimatedString {
            attribute (DOMString or TrustedScriptURL) baseVal;
 };