diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
index 069782a..ff2bad8 100644
--- a/Source/WebCore/ChangeLog
+++ b/Source/WebCore/ChangeLog
@@ -1,3 +1,26 @@
+2019-10-11  Chris Dumez  <cdumez@apple.com>
+
+        Add [ActiveDOMObject] to IDLs of ActiveDOMObjects
+        https://bugs.webkit.org/show_bug.cgi?id=202869
+
+        Reviewed by Ryosuke Niwa.
+
+        Add [ActiveDOMObject] to IDLs of ActiveDOMObjects, this is necessary so that the wrapper
+        stays alive as long as ActiveDOMObject::hasPendingActivity() returns true. We may have
+        subtle lifetime bugs otherwise.
+
+        * Modules/encryptedmedia/MediaKeySession.h:
+        * Modules/encryptedmedia/MediaKeySession.idl:
+        * Modules/entriesapi/FileSystemDirectoryReader.idl:
+        * Modules/entriesapi/FileSystemEntry.idl:
+        * Modules/geolocation/Geolocation.idl:
+        * Modules/indexeddb/IDBObjectStore.h:
+        * Modules/indexeddb/IDBObjectStore.idl:
+        * Modules/paymentrequest/PaymentResponse.idl:
+        * Modules/webvr/VRDisplay.h:
+        * Modules/webvr/VRDisplay.idl:
+        * workers/service/ServiceWorkerContainer.idl:
+
 2019-10-11  Devin Rousso  <drousso@apple.com>
 
         Web Inspector: Elements: Computed: show shorthand properties in addition to longhand ones
diff --git a/Source/WebCore/Modules/encryptedmedia/MediaKeySession.h b/Source/WebCore/Modules/encryptedmedia/MediaKeySession.h
index 823844f..c4795d8 100644
--- a/Source/WebCore/Modules/encryptedmedia/MediaKeySession.h
+++ b/Source/WebCore/Modules/encryptedmedia/MediaKeySession.h
@@ -81,6 +81,9 @@
 
     const Vector<std::pair<Ref<SharedBuffer>, MediaKeyStatus>>& statuses() const { return m_statuses; }
 
+    // ActiveDOMObject
+    bool hasPendingActivity() const override;
+
 private:
     MediaKeySession(ScriptExecutionContext&, WeakPtr<MediaKeys>&&, MediaKeySessionType, bool useDistinctiveIdentifier, Ref<CDM>&&, Ref<CDMInstanceSession>&&);
     void enqueueMessage(MediaKeyMessageType, const SharedBuffer&);
@@ -100,7 +103,6 @@
     void derefEventTarget() override { deref(); }
 
     // ActiveDOMObject
-    bool hasPendingActivity() const override;
     const char* activeDOMObjectName() const override;
     bool canSuspendForDocumentSuspension() const override;
     void stop() override;
diff --git a/Source/WebCore/Modules/encryptedmedia/MediaKeySession.idl b/Source/WebCore/Modules/encryptedmedia/MediaKeySession.idl
index b38c92c..bbe68c5 100644
--- a/Source/WebCore/Modules/encryptedmedia/MediaKeySession.idl
+++ b/Source/WebCore/Modules/encryptedmedia/MediaKeySession.idl
@@ -27,6 +27,7 @@
  */
 
 [
+    ActiveDOMObject,
     Conditional=ENCRYPTED_MEDIA,
     EnabledAtRuntime=EncryptedMediaAPI,
     DisabledByQuirk=hasBrokenEncryptedMediaAPISupport,
diff --git a/Source/WebCore/Modules/entriesapi/FileSystemDirectoryReader.idl b/Source/WebCore/Modules/entriesapi/FileSystemDirectoryReader.idl
index 65d2c61..d0f358c 100644
--- a/Source/WebCore/Modules/entriesapi/FileSystemDirectoryReader.idl
+++ b/Source/WebCore/Modules/entriesapi/FileSystemDirectoryReader.idl
@@ -24,6 +24,7 @@
  */
 
 [
+    ActiveDOMObject,
     EnabledAtRuntime=DirectoryUpload,
 ] interface FileSystemDirectoryReader {
     [CallWith=ScriptExecutionContext] void readEntries(FileSystemEntriesCallback successCallback, optional ErrorCallback? errorCallback);
diff --git a/Source/WebCore/Modules/entriesapi/FileSystemEntry.idl b/Source/WebCore/Modules/entriesapi/FileSystemEntry.idl
index be0692f..e8c6d93 100644
--- a/Source/WebCore/Modules/entriesapi/FileSystemEntry.idl
+++ b/Source/WebCore/Modules/entriesapi/FileSystemEntry.idl
@@ -24,6 +24,7 @@
  */
 
 [
+    ActiveDOMObject,
     CustomToJSObject,
     EnabledAtRuntime=DirectoryUpload,
 ] interface FileSystemEntry {
diff --git a/Source/WebCore/Modules/geolocation/Geolocation.idl b/Source/WebCore/Modules/geolocation/Geolocation.idl
index edadd3a..5e68dc8 100644
--- a/Source/WebCore/Modules/geolocation/Geolocation.idl
+++ b/Source/WebCore/Modules/geolocation/Geolocation.idl
@@ -25,6 +25,7 @@
 
 // http://www.w3.org/TR/geolocation-API/#geolocation_interface
 [
+    ActiveDOMObject,
     Conditional=GEOLOCATION, 
     GenerateIsReachable=ReachableFromNavigator,
 ] interface Geolocation {
diff --git a/Source/WebCore/Modules/indexeddb/IDBIndex.h b/Source/WebCore/Modules/indexeddb/IDBIndex.h
index 881ef64..f83c1f1 100644
--- a/Source/WebCore/Modules/indexeddb/IDBIndex.h
+++ b/Source/WebCore/Modules/indexeddb/IDBIndex.h
@@ -42,7 +42,7 @@
 
 struct IDBKeyRangeData;
 
-class IDBIndex final : private ActiveDOMObject {
+class IDBIndex final : public ActiveDOMObject {
     WTF_MAKE_NONCOPYABLE(IDBIndex);
     WTF_MAKE_FAST_ALLOCATED;
 public:
@@ -87,6 +87,8 @@
 
     void* objectStoreAsOpaqueRoot() { return &m_objectStore; }
 
+    bool hasPendingActivity() const final;
+
 private:
     ExceptionOr<Ref<IDBRequest>> doCount(JSC::ExecState&, const IDBKeyRangeData&);
     ExceptionOr<Ref<IDBRequest>> doGet(JSC::ExecState&, ExceptionOr<IDBKeyRangeData>);
@@ -98,7 +100,6 @@
 
     const char* activeDOMObjectName() const final;
     bool canSuspendForDocumentSuspension() const final;
-    bool hasPendingActivity() const final;
 
     IDBIndexInfo m_info;
     IDBIndexInfo m_originalInfo;
diff --git a/Source/WebCore/Modules/indexeddb/IDBIndex.idl b/Source/WebCore/Modules/indexeddb/IDBIndex.idl
index 7546984..9f68548 100644
--- a/Source/WebCore/Modules/indexeddb/IDBIndex.idl
+++ b/Source/WebCore/Modules/indexeddb/IDBIndex.idl
@@ -28,6 +28,7 @@
 typedef (DOMString or sequence<DOMString>) IDBKeyPath;
 
 [
+    ActiveDOMObject,
     Conditional=INDEXED_DATABASE,
     GenerateIsReachable=Impl,
     JSCustomMarkFunction,
diff --git a/Source/WebCore/Modules/indexeddb/IDBObjectStore.h b/Source/WebCore/Modules/indexeddb/IDBObjectStore.h
index 61a950e..d342563 100644
--- a/Source/WebCore/Modules/indexeddb/IDBObjectStore.h
+++ b/Source/WebCore/Modules/indexeddb/IDBObjectStore.h
@@ -112,6 +112,8 @@
     void visitReferencedIndexes(JSC::SlotVisitor&) const;
     void renameReferencedIndex(IDBIndex&, const String& newName);
 
+    bool hasPendingActivity() const final;
+
 private:
     enum class InlineKeyCheck { Perform, DoNotPerform };
     ExceptionOr<Ref<IDBRequest>> putOrAdd(JSC::ExecState&, JSC::JSValue, RefPtr<IDBKey>, IndexedDB::ObjectStoreOverwriteMode, InlineKeyCheck);
@@ -124,7 +126,6 @@
 
     const char* activeDOMObjectName() const final;
     bool canSuspendForDocumentSuspension() const final;
-    bool hasPendingActivity() const final;
 
     IDBObjectStoreInfo m_info;
     IDBObjectStoreInfo m_originalInfo;
diff --git a/Source/WebCore/Modules/indexeddb/IDBObjectStore.idl b/Source/WebCore/Modules/indexeddb/IDBObjectStore.idl
index cbb9187..3a7efe9 100644
--- a/Source/WebCore/Modules/indexeddb/IDBObjectStore.idl
+++ b/Source/WebCore/Modules/indexeddb/IDBObjectStore.idl
@@ -28,6 +28,7 @@
 typedef (DOMString or sequence<DOMString>) IDBKeyPath;
 
 [
+    ActiveDOMObject,
     Conditional=INDEXED_DATABASE,
     GenerateIsReachable=Impl,
     JSCustomMarkFunction,
diff --git a/Source/WebCore/Modules/paymentrequest/PaymentResponse.idl b/Source/WebCore/Modules/paymentrequest/PaymentResponse.idl
index c6447949..c45c635 100644
--- a/Source/WebCore/Modules/paymentrequest/PaymentResponse.idl
+++ b/Source/WebCore/Modules/paymentrequest/PaymentResponse.idl
@@ -24,6 +24,7 @@
  */
 
 [
+    ActiveDOMObject,
     Conditional=PAYMENT_REQUEST,
     EnabledBySetting=PaymentRequest,
     Exposed=Window,
diff --git a/Source/WebCore/Modules/webgpu/GPUCanvasContext.h b/Source/WebCore/Modules/webgpu/GPUCanvasContext.h
index 25cd17b..cd818ce 100644
--- a/Source/WebCore/Modules/webgpu/GPUCanvasContext.h
+++ b/Source/WebCore/Modules/webgpu/GPUCanvasContext.h
@@ -46,6 +46,9 @@
     WebGPUSwapChain* swapChain() const { return m_swapChain.get(); }
     Ref<WebGPUSwapChain> configureSwapChain(const WebGPUSwapChainDescriptor&);
 
+    // FIXME: Stubs.
+    bool hasPendingActivity() const final { return false; }
+
 private:
     GPUCanvasContext(CanvasBase&);
 
@@ -56,7 +59,6 @@
     void markLayerComposited() final;
     const char* activeDOMObjectName() const final { return "GPUCanvasContext"; }
     // FIXME: Stubs.
-    bool hasPendingActivity() const final { return false; }
     void stop() final { }
     bool canSuspendForDocumentSuspension() const final { return false; }
 
diff --git a/Source/WebCore/Modules/webgpu/GPUCanvasContext.idl b/Source/WebCore/Modules/webgpu/GPUCanvasContext.idl
index 1b20cab..de452c7 100644
--- a/Source/WebCore/Modules/webgpu/GPUCanvasContext.idl
+++ b/Source/WebCore/Modules/webgpu/GPUCanvasContext.idl
@@ -37,6 +37,7 @@
 };
 
 [
+    ActiveDOMObject,
     Conditional=WEBGPU,
     EnabledAtRuntime=WebGPU
 ] interface GPUCanvasContext {
diff --git a/Source/WebCore/Modules/webvr/VRDisplay.h b/Source/WebCore/Modules/webvr/VRDisplay.h
index 1cad846..1cd75d8 100644
--- a/Source/WebCore/Modules/webvr/VRDisplay.h
+++ b/Source/WebCore/Modules/webvr/VRDisplay.h
@@ -92,6 +92,9 @@
     void platformDisplayMounted() override;
     void platformDisplayUnmounted() override;
 
+    // ActiveDOMObject
+    bool hasPendingActivity() const override;
+
 private:
     VRDisplay(ScriptExecutionContext&, WeakPtr<VRPlatformDisplay>&&);
 
@@ -102,7 +105,6 @@
     void derefEventTarget() override { deref(); }
 
     // ActiveDOMObject
-    bool hasPendingActivity() const override;
     const char* activeDOMObjectName() const override;
     bool canSuspendForDocumentSuspension() const override;
     void stop() override;
diff --git a/Source/WebCore/Modules/webvr/VRDisplay.idl b/Source/WebCore/Modules/webvr/VRDisplay.idl
index 9735dbf..ba7dd4f 100644
--- a/Source/WebCore/Modules/webvr/VRDisplay.idl
+++ b/Source/WebCore/Modules/webvr/VRDisplay.idl
@@ -24,6 +24,7 @@
  */
 
 [
+    ActiveDOMObject,
     EnabledAtRuntime=WebVR,
 ] interface VRDisplay : EventTarget {
     readonly attribute boolean isConnected;
diff --git a/Source/WebCore/bindings/scripts/CodeGeneratorJS.pm b/Source/WebCore/bindings/scripts/CodeGeneratorJS.pm
index 0876179..1f4f755 100644
--- a/Source/WebCore/bindings/scripts/CodeGeneratorJS.pm
+++ b/Source/WebCore/bindings/scripts/CodeGeneratorJS.pm
@@ -4366,6 +4366,15 @@
         push(@implContent, "    ASSERT(inherits(vm, info()));\n\n");
     }
 
+    if (!$codeGenerator->InheritsExtendedAttribute($interface, "JSBuiltin")) {
+        AddToImplIncludes("ActiveDOMObject.h");
+        if ($codeGenerator->InheritsExtendedAttribute($interface, "ActiveDOMObject")) {
+            push(@implContent, "    static_assert(std::is_base_of<ActiveDOMObject, ${implType}>::value, \"Interface is marked as [ActiveDOMObject] but implementation class does not subclass ActiveDOMObject.\");\n\n");
+        } else {
+            push(@implContent, "    static_assert(!std::is_base_of<ActiveDOMObject, ${implType}>::value, \"Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.\");\n\n");
+        }
+    }
+
     if ($interfaceName eq "Location") {
         push(@implContent, "    putDirect(vm, vm.propertyNames->valueOf, globalObject()->objectProtoValueOfFunction(), JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::DontEnum);\n");
         push(@implContent, "    putDirect(vm, vm.propertyNames->toPrimitiveSymbol, jsUndefined(), JSC::PropertyAttribute::DontDelete | JSC::PropertyAttribute::ReadOnly | JSC::PropertyAttribute::DontEnum);\n");
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSInterfaceName.cpp b/Source/WebCore/bindings/scripts/test/JS/JSInterfaceName.cpp
index 41d8894..460ebab 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSInterfaceName.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSInterfaceName.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSInterfaceName.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
 #include "JSDOMExceptionHandling.h"
@@ -111,6 +112,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, InterfaceName>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSInterfaceName::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSMapLike.cpp b/Source/WebCore/bindings/scripts/test/JS/JSMapLike.cpp
index 9c38995..6caa3c3 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSMapLike.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSMapLike.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSMapLike.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -141,6 +142,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, MapLike>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
     synchronizeBackingMap(*globalObject()->globalExec(), *globalObject(), *this);
 }
 
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSReadOnlyMapLike.cpp b/Source/WebCore/bindings/scripts/test/JS/JSReadOnlyMapLike.cpp
index cfa2810..73c77bf 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSReadOnlyMapLike.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSReadOnlyMapLike.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSReadOnlyMapLike.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -135,6 +136,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, ReadOnlyMapLike>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
     synchronizeBackingMap(*globalObject()->globalExec(), *globalObject(), *this);
 }
 
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestActiveDOMObject.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestActiveDOMObject.cpp
index a1477e1..b509e8f 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestActiveDOMObject.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestActiveDOMObject.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestActiveDOMObject.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMBindingSecurity.h"
@@ -140,6 +141,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestActiveDOMObject>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestActiveDOMObject::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestCEReactions.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestCEReactions.cpp
index 30e4d8d..a6772a4 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestCEReactions.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestCEReactions.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestCEReactions.h"
 
+#include "ActiveDOMObject.h"
 #include "CustomElementReactionQueue.h"
 #include "HTMLNames.h"
 #include "JSDOMAttribute.h"
@@ -144,6 +145,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestCEReactions>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestCEReactions::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestCEReactionsStringifier.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestCEReactionsStringifier.cpp
index 38d41f3..912c6ef 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestCEReactionsStringifier.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestCEReactionsStringifier.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestCEReactionsStringifier.h"
 
+#include "ActiveDOMObject.h"
 #include "CustomElementReactionQueue.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
@@ -126,6 +127,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestCEReactionsStringifier>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestCEReactionsStringifier::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestCallTracer.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestCallTracer.cpp
index 6c03f47..341fa7d 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestCallTracer.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestCallTracer.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestCallTracer.h"
 
+#include "ActiveDOMObject.h"
 #include "CallTracer.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
@@ -164,6 +165,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestCallTracer>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestCallTracer::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestClassWithJSBuiltinConstructor.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestClassWithJSBuiltinConstructor.cpp
index 20910cb..fbf827f 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestClassWithJSBuiltinConstructor.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestClassWithJSBuiltinConstructor.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestClassWithJSBuiltinConstructor.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMBuiltinConstructor.h"
 #include "JSDOMExceptionHandling.h"
@@ -117,6 +118,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestClassWithJSBuiltinConstructor>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestClassWithJSBuiltinConstructor::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestDOMJIT.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestDOMJIT.cpp
index 6127d8e..9129eed46 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestDOMJIT.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestDOMJIT.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestDOMJIT.h"
 
+#include "ActiveDOMObject.h"
 #include "DOMJITAbstractHeapRepository.h"
 #include "DOMJITIDLConvert.h"
 #include "DOMJITIDLType.h"
@@ -573,6 +574,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestDOMJIT>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestDOMJIT::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestEnabledBySetting.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestEnabledBySetting.cpp
index 5957b63..aaf76cf 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestEnabledBySetting.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestEnabledBySetting.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestEnabledBySetting.h"
 
+#include "ActiveDOMObject.h"
 #include "Document.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
@@ -162,6 +163,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestEnabledBySetting>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
     if (downcast<Document>(jsCast<JSDOMGlobalObject*>(globalObject())->scriptExecutionContext())->settings().testSettingEnabled())
         putDirectCustomAccessor(vm, static_cast<JSVMClientData*>(vm.clientData)->builtinNames().TestSubObjEnabledBySettingPublicName(), CustomGetterSetter::create(vm, jsTestEnabledBySettingTestSubObjEnabledBySettingConstructor, setJSTestEnabledBySettingTestSubObjEnabledBySettingConstructor), attributesForStructure(static_cast<unsigned>(JSC::PropertyAttribute::DontEnum)));
 }
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestEnabledForContext.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestEnabledForContext.cpp
index e471487..584b162 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestEnabledForContext.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestEnabledForContext.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestEnabledForContext.h"
 
+#include "ActiveDOMObject.h"
 #include "Document.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
@@ -118,6 +119,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestEnabledForContext>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
     if ((downcast<Document>(jsCast<JSDOMGlobalObject*>(globalObject())->scriptExecutionContext())->settings().testSettingEnabled() && TestSubObjEnabledForContext::enabledForContext(*jsCast<JSDOMGlobalObject*>(globalObject())->scriptExecutionContext())))
         putDirectCustomAccessor(vm, static_cast<JSVMClientData*>(vm.clientData)->builtinNames().TestSubObjEnabledForContextPublicName(), CustomGetterSetter::create(vm, jsTestEnabledForContextTestSubObjEnabledForContextConstructor, setJSTestEnabledForContextTestSubObjEnabledForContextConstructor), attributesForStructure(static_cast<unsigned>(JSC::PropertyAttribute::DontEnum)));
 }
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestEventConstructor.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestEventConstructor.cpp
index 554ec8a..ab0415d 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestEventConstructor.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestEventConstructor.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestEventConstructor.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructor.h"
@@ -218,6 +219,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestEventConstructor>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestEventConstructor::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestEventTarget.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestEventTarget.cpp
index bc605f7..f198c26 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestEventTarget.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestEventTarget.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestEventTarget.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -121,6 +122,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestEventTarget>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestEventTarget::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestException.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestException.cpp
index 6003e81..a330006 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestException.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestException.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestException.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -115,6 +116,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestException>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestException::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestGenerateIsReachable.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestGenerateIsReachable.cpp
index 3a4bdf1..e7cc62f 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestGenerateIsReachable.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestGenerateIsReachable.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestGenerateIsReachable.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -124,6 +125,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestGenerateIsReachable>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestGenerateIsReachable::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestGlobalObject.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestGlobalObject.cpp
index d781285..d1cefd3 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestGlobalObject.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestGlobalObject.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestGlobalObject.h"
 
+#include "ActiveDOMObject.h"
 #include "DOMWrapperWorld.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
@@ -701,6 +702,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestGlobalObject>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 #if ENABLE(TEST_FEATURE)
     if (RuntimeEnabledFeatures::sharedFeatures().testFeatureEnabled())
         putDirectCustomAccessor(vm, static_cast<JSVMClientData*>(vm.clientData)->builtinNames().enabledAtRuntimeAttributePublicName(), CustomGetterSetter::create(vm, jsTestGlobalObjectEnabledAtRuntimeAttribute, setJSTestGlobalObjectEnabledAtRuntimeAttribute), attributesForStructure(static_cast<unsigned>(JSC::PropertyAttribute::CustomAccessor)));
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestIndexedSetterNoIdentifier.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestIndexedSetterNoIdentifier.cpp
index 5b86f1d..193a7b5 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestIndexedSetterNoIdentifier.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestIndexedSetterNoIdentifier.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestIndexedSetterNoIdentifier.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
 #include "JSDOMConvertStrings.h"
@@ -113,6 +114,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestIndexedSetterNoIdentifier>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestIndexedSetterNoIdentifier::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestIndexedSetterThrowingException.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestIndexedSetterThrowingException.cpp
index 976d390..91b70c8 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestIndexedSetterThrowingException.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestIndexedSetterThrowingException.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestIndexedSetterThrowingException.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
 #include "JSDOMConvertStrings.h"
@@ -113,6 +114,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestIndexedSetterThrowingException>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestIndexedSetterThrowingException::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestIndexedSetterWithIdentifier.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestIndexedSetterWithIdentifier.cpp
index f5f867c..095a79e 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestIndexedSetterWithIdentifier.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestIndexedSetterWithIdentifier.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestIndexedSetterWithIdentifier.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
 #include "JSDOMConvertNumbers.h"
@@ -120,6 +121,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestIndexedSetterWithIdentifier>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestIndexedSetterWithIdentifier::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestInterface.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestInterface.cpp
index d45ad06..3ced44e 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestInterface.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestInterface.cpp
@@ -24,6 +24,7 @@
 
 #include "JSTestInterface.h"
 
+#include "ActiveDOMObject.h"
 #include "HTMLNames.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
@@ -417,6 +418,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(std::is_base_of<ActiveDOMObject, TestInterface>::value, "Interface is marked as [ActiveDOMObject] but implementation class does not subclass ActiveDOMObject.");
+
 }
 
 JSObject* JSTestInterface::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestInterfaceLeadingUnderscore.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestInterfaceLeadingUnderscore.cpp
index c28511e..dbd9076 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestInterfaceLeadingUnderscore.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestInterfaceLeadingUnderscore.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestInterfaceLeadingUnderscore.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -115,6 +116,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestInterfaceLeadingUnderscore>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestInterfaceLeadingUnderscore::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestIterable.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestIterable.cpp
index 87a881d..9932bc5 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestIterable.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestIterable.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestIterable.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
 #include "JSDOMExceptionHandling.h"
@@ -127,6 +128,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestIterable>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestIterable::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestMediaQueryListListener.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestMediaQueryListListener.cpp
index 93c1f4b..afff51d 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestMediaQueryListListener.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestMediaQueryListListener.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestMediaQueryListListener.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
 #include "JSDOMConvertCallbacks.h"
@@ -120,6 +121,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestMediaQueryListListener>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestMediaQueryListListener::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedAndIndexedSetterNoIdentifier.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedAndIndexedSetterNoIdentifier.cpp
index 9acae61..67bdb6f 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedAndIndexedSetterNoIdentifier.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedAndIndexedSetterNoIdentifier.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedAndIndexedSetterNoIdentifier.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -114,6 +115,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedAndIndexedSetterNoIdentifier>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedAndIndexedSetterNoIdentifier::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedAndIndexedSetterThrowingException.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedAndIndexedSetterThrowingException.cpp
index 80f3c46..ce05e81 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedAndIndexedSetterThrowingException.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedAndIndexedSetterThrowingException.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedAndIndexedSetterThrowingException.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -114,6 +115,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedAndIndexedSetterThrowingException>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedAndIndexedSetterThrowingException::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedAndIndexedSetterWithIdentifier.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedAndIndexedSetterWithIdentifier.cpp
index 48b7cca..ef68527 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedAndIndexedSetterWithIdentifier.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedAndIndexedSetterWithIdentifier.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedAndIndexedSetterWithIdentifier.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -123,6 +124,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedAndIndexedSetterWithIdentifier>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedAndIndexedSetterWithIdentifier::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedConstructor.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedConstructor.cpp
index 5b231db..2c5066d 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedConstructor.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedConstructor.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedConstructor.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
 #include "JSDOMConvertInterface.h"
@@ -149,6 +150,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(std::is_base_of<ActiveDOMObject, TestNamedConstructor>::value, "Interface is marked as [ActiveDOMObject] but implementation class does not subclass ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedConstructor::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterNoIdentifier.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterNoIdentifier.cpp
index 85e8a2d..4fd4443 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterNoIdentifier.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterNoIdentifier.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedDeleterNoIdentifier.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -113,6 +114,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedDeleterNoIdentifier>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedDeleterNoIdentifier::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterThrowingException.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterThrowingException.cpp
index f8d736c..76d6886 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterThrowingException.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterThrowingException.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedDeleterThrowingException.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -113,6 +114,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedDeleterThrowingException>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedDeleterThrowingException::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterWithIdentifier.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterWithIdentifier.cpp
index 83d7f99..6c39a42 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterWithIdentifier.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterWithIdentifier.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedDeleterWithIdentifier.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -119,6 +120,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedDeleterWithIdentifier>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedDeleterWithIdentifier::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterWithIndexedGetter.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterWithIndexedGetter.cpp
index 69e38e5..d381da0 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterWithIndexedGetter.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedDeleterWithIndexedGetter.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedDeleterWithIndexedGetter.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -114,6 +115,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedDeleterWithIndexedGetter>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedDeleterWithIndexedGetter::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedGetterCallWith.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedGetterCallWith.cpp
index 2617730..6288602 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedGetterCallWith.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedGetterCallWith.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedGetterCallWith.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -113,6 +114,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedGetterCallWith>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedGetterCallWith::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedGetterNoIdentifier.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedGetterNoIdentifier.cpp
index 5237444..3830ea86 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedGetterNoIdentifier.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedGetterNoIdentifier.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedGetterNoIdentifier.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -113,6 +114,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedGetterNoIdentifier>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedGetterNoIdentifier::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedGetterWithIdentifier.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedGetterWithIdentifier.cpp
index 3a489e1..cc1bc7cb 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedGetterWithIdentifier.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedGetterWithIdentifier.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedGetterWithIdentifier.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -119,6 +120,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedGetterWithIdentifier>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedGetterWithIdentifier::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterNoIdentifier.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterNoIdentifier.cpp
index 5e982ce..0853040 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterNoIdentifier.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterNoIdentifier.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedSetterNoIdentifier.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -113,6 +114,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedSetterNoIdentifier>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedSetterNoIdentifier::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterThrowingException.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterThrowingException.cpp
index e84c687..835ce85 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterThrowingException.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterThrowingException.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedSetterThrowingException.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -113,6 +114,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedSetterThrowingException>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedSetterThrowingException::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithIdentifier.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithIdentifier.cpp
index 8e4224c..631eca3 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithIdentifier.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithIdentifier.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedSetterWithIdentifier.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -119,6 +120,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedSetterWithIdentifier>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedSetterWithIdentifier::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithIndexedGetter.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithIndexedGetter.cpp
index 8e434b9..322c601 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithIndexedGetter.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithIndexedGetter.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedSetterWithIndexedGetter.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -123,6 +124,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedSetterWithIndexedGetter>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedSetterWithIndexedGetter::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithIndexedGetterAndSetter.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithIndexedGetterAndSetter.cpp
index 31973fd..2e95fe6 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithIndexedGetterAndSetter.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithIndexedGetterAndSetter.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedSetterWithIndexedGetterAndSetter.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -123,6 +124,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedSetterWithIndexedGetterAndSetter>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedSetterWithIndexedGetterAndSetter::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithOverrideBuiltins.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithOverrideBuiltins.cpp
index ca7ac6c..6789414 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithOverrideBuiltins.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithOverrideBuiltins.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedSetterWithOverrideBuiltins.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -113,6 +114,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedSetterWithOverrideBuiltins>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedSetterWithOverrideBuiltins::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithUnforgableProperties.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithUnforgableProperties.cpp
index f6bf263..e7666ef 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithUnforgableProperties.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithUnforgableProperties.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedSetterWithUnforgableProperties.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
@@ -137,6 +138,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedSetterWithUnforgableProperties>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedSetterWithUnforgableProperties::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithUnforgablePropertiesAndOverrideBuiltins.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithUnforgablePropertiesAndOverrideBuiltins.cpp
index 8d427fd..bf44064 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithUnforgablePropertiesAndOverrideBuiltins.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNamedSetterWithUnforgablePropertiesAndOverrideBuiltins.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNamedSetterWithUnforgablePropertiesAndOverrideBuiltins.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
@@ -137,6 +138,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNamedSetterWithUnforgablePropertiesAndOverrideBuiltins>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNamedSetterWithUnforgablePropertiesAndOverrideBuiltins::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestNode.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestNode.cpp
index a2a1801..860cf3d 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestNode.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestNode.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestNode.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructor.h"
@@ -209,6 +210,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestNode>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestNode::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestObj.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestObj.cpp
index 20932eb..db4147a 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestObj.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestObj.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestObj.h"
 
+#include "ActiveDOMObject.h"
 #include "DOMPromiseProxy.h"
 #include "DOMWindow.h"
 #include "DOMWrapperWorld.h"
@@ -2443,6 +2444,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestObj>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestObj::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestOverloadedConstructors.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestOverloadedConstructors.cpp
index 3266374..c5b3a93 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestOverloadedConstructors.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestOverloadedConstructors.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestOverloadedConstructors.h"
 
+#include "ActiveDOMObject.h"
 #include "JSBlob.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructor.h"
@@ -206,6 +207,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestOverloadedConstructors>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestOverloadedConstructors::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestOverloadedConstructorsWithSequence.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestOverloadedConstructorsWithSequence.cpp
index 2a29a48..bf5493a 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestOverloadedConstructorsWithSequence.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestOverloadedConstructorsWithSequence.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestOverloadedConstructorsWithSequence.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructor.h"
 #include "JSDOMConvertInterface.h"
@@ -162,6 +163,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestOverloadedConstructorsWithSequence>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestOverloadedConstructorsWithSequence::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestOverrideBuiltins.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestOverrideBuiltins.cpp
index f31c9c2..2416180 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestOverrideBuiltins.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestOverrideBuiltins.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestOverrideBuiltins.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAbstractOperations.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -122,6 +123,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestOverrideBuiltins>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestOverrideBuiltins::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestPluginInterface.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestPluginInterface.cpp
index 0391430..14c1091 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestPluginInterface.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestPluginInterface.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestPluginInterface.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
 #include "JSDOMExceptionHandling.h"
@@ -112,6 +113,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestPluginInterface>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestPluginInterface::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestPromiseRejectionEvent.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestPromiseRejectionEvent.cpp
index bd6c492..88e31ac 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestPromiseRejectionEvent.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestPromiseRejectionEvent.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestPromiseRejectionEvent.h"
 
+#include "ActiveDOMObject.h"
 #include "DOMPromiseProxy.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
@@ -215,6 +216,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestPromiseRejectionEvent>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestPromiseRejectionEvent::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestSerialization.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestSerialization.cpp
index f88a6e1..2a031d0 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestSerialization.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestSerialization.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestSerialization.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -166,6 +167,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestSerialization>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestSerialization::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestSerializationIndirectInheritance.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestSerializationIndirectInheritance.cpp
index d4acb3a..c8204d7 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestSerializationIndirectInheritance.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestSerializationIndirectInheritance.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestSerializationIndirectInheritance.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
 #include "JSDOMExceptionHandling.h"
@@ -109,6 +110,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestSerializationIndirectInheritance>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestSerializationIndirectInheritance::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestSerializationInherit.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestSerializationInherit.cpp
index be1f378..c2de88e 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestSerializationInherit.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestSerializationInherit.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestSerializationInherit.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -121,6 +122,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestSerializationInherit>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestSerializationInherit::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestSerializationInheritFinal.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestSerializationInheritFinal.cpp
index dcc3cee..872b831d 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestSerializationInheritFinal.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestSerializationInheritFinal.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestSerializationInheritFinal.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -124,6 +125,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestSerializationInheritFinal>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestSerializationInheritFinal::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestSerializedScriptValueInterface.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestSerializedScriptValueInterface.cpp
index 0eef416..97005f8 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestSerializedScriptValueInterface.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestSerializedScriptValueInterface.cpp
@@ -24,6 +24,7 @@
 
 #include "JSTestSerializedScriptValueInterface.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -142,6 +143,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestSerializedScriptValueInterface>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestSerializedScriptValueInterface::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestStringifier.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestStringifier.cpp
index 71966f7..0493242 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestStringifier.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestStringifier.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestStringifier.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
 #include "JSDOMConvertStrings.h"
@@ -118,6 +119,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestStringifier>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestStringifier::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierAnonymousOperation.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierAnonymousOperation.cpp
index 3e2d889..b882469 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierAnonymousOperation.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierAnonymousOperation.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestStringifierAnonymousOperation.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
 #include "JSDOMConvertStrings.h"
@@ -118,6 +119,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestStringifierAnonymousOperation>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestStringifierAnonymousOperation::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierNamedOperation.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierNamedOperation.cpp
index 4091384..3aa7c36 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierNamedOperation.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierNamedOperation.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestStringifierNamedOperation.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
 #include "JSDOMConvertStrings.h"
@@ -120,6 +121,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestStringifierNamedOperation>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestStringifierNamedOperation::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierOperationImplementedAs.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierOperationImplementedAs.cpp
index c02cff9..24260f5 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierOperationImplementedAs.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierOperationImplementedAs.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestStringifierOperationImplementedAs.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
 #include "JSDOMConvertStrings.h"
@@ -120,6 +121,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestStringifierOperationImplementedAs>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestStringifierOperationImplementedAs::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierOperationNamedToString.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierOperationNamedToString.cpp
index d21ac3d..76cce63 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierOperationNamedToString.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierOperationNamedToString.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestStringifierOperationNamedToString.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
 #include "JSDOMConvertStrings.h"
@@ -118,6 +119,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestStringifierOperationNamedToString>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestStringifierOperationNamedToString::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierReadOnlyAttribute.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierReadOnlyAttribute.cpp
index 163bf62..1375cc9 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierReadOnlyAttribute.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierReadOnlyAttribute.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestStringifierReadOnlyAttribute.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -121,6 +122,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestStringifierReadOnlyAttribute>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestStringifierReadOnlyAttribute::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierReadWriteAttribute.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierReadWriteAttribute.cpp
index 70c6fa5..ae0c1e2 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierReadWriteAttribute.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestStringifierReadWriteAttribute.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestStringifierReadWriteAttribute.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructorNotConstructable.h"
@@ -122,6 +123,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestStringifierReadWriteAttribute>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestStringifierReadWriteAttribute::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/bindings/scripts/test/JS/JSTestTypedefs.cpp b/Source/WebCore/bindings/scripts/test/JS/JSTestTypedefs.cpp
index d8b4389..f65e593 100644
--- a/Source/WebCore/bindings/scripts/test/JS/JSTestTypedefs.cpp
+++ b/Source/WebCore/bindings/scripts/test/JS/JSTestTypedefs.cpp
@@ -21,6 +21,7 @@
 #include "config.h"
 #include "JSTestTypedefs.h"
 
+#include "ActiveDOMObject.h"
 #include "JSDOMAttribute.h"
 #include "JSDOMBinding.h"
 #include "JSDOMConstructor.h"
@@ -225,6 +226,8 @@
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 
+    static_assert(!std::is_base_of<ActiveDOMObject, TestTypedefs>::value, "Interface is not marked as [ActiveDOMObject] even though implementation class subclasses ActiveDOMObject.");
+
 }
 
 JSObject* JSTestTypedefs::createPrototype(VM& vm, JSDOMGlobalObject& globalObject)
diff --git a/Source/WebCore/css/FontFaceSet.h b/Source/WebCore/css/FontFaceSet.h
index 38ed5ed..9f728ef 100644
--- a/Source/WebCore/css/FontFaceSet.h
+++ b/Source/WebCore/css/FontFaceSet.h
@@ -38,7 +38,7 @@
 
 class DOMException;
 
-class FontFaceSet final : public RefCounted<FontFaceSet>, private CSSFontFaceSetClient, public EventTargetWithInlineData, private  ActiveDOMObject {
+class FontFaceSet final : public RefCounted<FontFaceSet>, private CSSFontFaceSetClient, public EventTargetWithInlineData, public ActiveDOMObject {
     WTF_MAKE_ISO_ALLOCATED(FontFaceSet);
 public:
     static Ref<FontFaceSet> create(Document&, const Vector<RefPtr<FontFace>>& initialFaces);
diff --git a/Source/WebCore/css/FontFaceSet.idl b/Source/WebCore/css/FontFaceSet.idl
index d407489..96dc7b1 100644
--- a/Source/WebCore/css/FontFaceSet.idl
+++ b/Source/WebCore/css/FontFaceSet.idl
@@ -29,6 +29,7 @@
 };
 
 [
+    ActiveDOMObject,
     ConstructorCallWith=Document,
     Constructor(sequence<FontFace> initialFaces),
 ] interface FontFaceSet : EventTarget {
diff --git a/Source/WebCore/html/HTMLMarqueeElement.h b/Source/WebCore/html/HTMLMarqueeElement.h
index 040cc95..05818a5 100644
--- a/Source/WebCore/html/HTMLMarqueeElement.h
+++ b/Source/WebCore/html/HTMLMarqueeElement.h
@@ -29,7 +29,7 @@
 
 class RenderMarquee;
 
-class HTMLMarqueeElement final : public HTMLElement, private ActiveDOMObject {
+class HTMLMarqueeElement final : public HTMLElement, public ActiveDOMObject {
     WTF_MAKE_ISO_ALLOCATED(HTMLMarqueeElement);
 public:
     static Ref<HTMLMarqueeElement> create(const QualifiedName&, Document&);
diff --git a/Source/WebCore/html/HTMLMarqueeElement.idl b/Source/WebCore/html/HTMLMarqueeElement.idl
index f8ff1c2..fa91f6d 100644
--- a/Source/WebCore/html/HTMLMarqueeElement.idl
+++ b/Source/WebCore/html/HTMLMarqueeElement.idl
@@ -17,7 +17,9 @@
  * Boston, MA 02110-1301, USA.
  */
 
-interface HTMLMarqueeElement : HTMLElement {
+[
+    ActiveDOMObject,
+] interface HTMLMarqueeElement : HTMLElement {
     void start();
     void stop();
     
diff --git a/Source/WebCore/html/HTMLSourceElement.h b/Source/WebCore/html/HTMLSourceElement.h
index e122733..8765871 100644
--- a/Source/WebCore/html/HTMLSourceElement.h
+++ b/Source/WebCore/html/HTMLSourceElement.h
@@ -32,7 +32,7 @@
 
 class MediaQuerySet;
 
-class HTMLSourceElement final : public HTMLElement, private ActiveDOMObject {
+class HTMLSourceElement final : public HTMLElement, public ActiveDOMObject {
     WTF_MAKE_ISO_ALLOCATED(HTMLSourceElement);
 public:
     static Ref<HTMLSourceElement> create(Document&);
diff --git a/Source/WebCore/html/HTMLSourceElement.idl b/Source/WebCore/html/HTMLSourceElement.idl
index ac63882..53c23ab 100644
--- a/Source/WebCore/html/HTMLSourceElement.idl
+++ b/Source/WebCore/html/HTMLSourceElement.idl
@@ -23,7 +23,9 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
  */
 
-interface HTMLSourceElement : HTMLElement {
+[
+    ActiveDOMObject,
+] interface HTMLSourceElement : HTMLElement {
     [CEReactions=NotNeeded, Reflect, URL] attribute USVString src;
     [CEReactions=NotNeeded, Reflect] attribute DOMString type;
     [CEReactions=NotNeeded, Reflect] attribute USVString srcset;
diff --git a/Source/WebCore/html/canvas/WebGL2RenderingContext.idl b/Source/WebCore/html/canvas/WebGL2RenderingContext.idl
index 866175a..da700e7 100644
--- a/Source/WebCore/html/canvas/WebGL2RenderingContext.idl
+++ b/Source/WebCore/html/canvas/WebGL2RenderingContext.idl
@@ -51,6 +51,7 @@
 #endif
 
 [
+    ActiveDOMObject,
     Conditional=WEBGL2,
     EnabledAtRuntime=WebGL2,
     JSCustomMarkFunction,
diff --git a/Source/WebCore/html/canvas/WebGLRenderingContext.idl b/Source/WebCore/html/canvas/WebGLRenderingContext.idl
index c8b97e5..1d2f688 100644
--- a/Source/WebCore/html/canvas/WebGLRenderingContext.idl
+++ b/Source/WebCore/html/canvas/WebGLRenderingContext.idl
@@ -34,6 +34,7 @@
 #endif
 
 [
+    ActiveDOMObject,
     Conditional=WEBGL,
     JSCustomMarkFunction,
     JSGenerateToJSObject,
diff --git a/Source/WebCore/html/canvas/WebGLRenderingContextBase.h b/Source/WebCore/html/canvas/WebGLRenderingContextBase.h
index 70db6f8..b172538 100644
--- a/Source/WebCore/html/canvas/WebGLRenderingContextBase.h
+++ b/Source/WebCore/html/canvas/WebGLRenderingContextBase.h
@@ -365,6 +365,9 @@
     void recycleContext() override;
     void dispatchContextChangedNotification() override;
 
+    // ActiveDOMObject
+    bool hasPendingActivity() const final;
+
 protected:
     WebGLRenderingContextBase(CanvasBase&, WebGLContextAttributes);
     WebGLRenderingContextBase(CanvasBase&, Ref<GraphicsContext3D>&&, WebGLContextAttributes);
@@ -388,7 +391,6 @@
     void setupFlags();
 
     // ActiveDOMObject
-    bool hasPendingActivity() const override;
     void stop() override;
     const char* activeDOMObjectName() const override;
     bool canSuspendForDocumentSuspension() const override;
diff --git a/Source/WebCore/workers/service/ServiceWorkerContainer.idl b/Source/WebCore/workers/service/ServiceWorkerContainer.idl
index 41fa7ad..484aed2 100644
--- a/Source/WebCore/workers/service/ServiceWorkerContainer.idl
+++ b/Source/WebCore/workers/service/ServiceWorkerContainer.idl
@@ -27,6 +27,7 @@
 // We don't currently support nested workers.
 
 [
+    ActiveDOMObject,
     SecureContext,
     Exposed=(Window,ServiceWorker),
     Conditional=SERVICE_WORKER,