diff --git a/dom/base/nsDocument.cpp b/dom/base/nsDocument.cpp
index 1cad2b659ee5..56765a519f7a 100644
--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -13188,7 +13188,20 @@ nsIDocument::SetUserHasInteracted(bool aUserHasInteracted)
 }
 
 void
-nsIDocument::MaybeNotifyUserActivation(nsIPrincipal* aPrincipal)
+nsIDocument::NotifyUserActivation()
+{
+  ActivateByUserGesture();
+  // Activate parent document which has same principle on the parent chain.
+  nsCOMPtr<nsIPrincipal> principal = NodePrincipal();
+  nsCOMPtr<nsIDocument> parent = GetSameTypeParentDocument();
+  while (parent) {
+    parent->MaybeActivateByUserGesture(principal);
+    parent = parent->GetSameTypeParentDocument();
+  }
+}
+
+void
+nsIDocument::MaybeActivateByUserGesture(nsIPrincipal* aPrincipal)
 {
   bool isEqual = false;
   nsresult rv = aPrincipal->Equals(NodePrincipal(), &isEqual);
@@ -13199,12 +13212,12 @@ nsIDocument::MaybeNotifyUserActivation(nsIPrincipal* aPrincipal)
   // If a child frame is actived, it would always activate the top frame and its
   // parent frames which has same priciple.
   if (isEqual || IsTopLevelContentDocument()) {
-    NotifyUserActivation();
+    ActivateByUserGesture();
   }
 }
 
 void
-nsIDocument::NotifyUserActivation()
+nsIDocument::ActivateByUserGesture()
 {
   if (mUserHasActivatedInteraction) {
     return;
diff --git a/dom/base/nsIDocument.h b/dom/base/nsIDocument.h
index f648974ae341..ce3c8afd8a9d 100644
--- a/dom/base/nsIDocument.h
+++ b/dom/base/nsIDocument.h
@@ -3071,21 +3071,13 @@ public:
     return mUserHasInteracted;
   }
 
-  // This would be called when document get activated by specific user gestures.
+  // This would be called when document get activated by specific user gestures
+  // and propagate the user activation flag to its parent.
   void NotifyUserActivation();
 
   // Return true if document has interacted by specific user gestures.
   bool HasBeenUserActivated();
 
-  void MaybeNotifyUserActivation(nsIPrincipal* aPrincipal);
-
-  // Return the same type parent docuement if exists, or return null.
-  nsIDocument* GetSameTypeParentDocument();
-
-  // Return the first parent document with same pricipal, return nullptr if we
-  // can't find it.
-  nsIDocument* GetFirstParentDocumentWithSamePrincipal(nsIPrincipal* aPrincipal);
-
   bool HasScriptsBlockedBySandbox();
 
   bool InlineScriptAllowedByCSP();
@@ -3275,6 +3267,17 @@ protected:
   // Helper for GetScrollingElement/IsScrollingElement.
   bool IsPotentiallyScrollable(mozilla::dom::HTMLBodyElement* aBody);
 
+  // Return the same type parent docuement if exists, or return null.
+  nsIDocument* GetSameTypeParentDocument();
+
+  // Return the first parent document with same pricipal, return nullptr if we
+  // can't find it.
+  nsIDocument* GetFirstParentDocumentWithSamePrincipal(nsIPrincipal* aPrincipal);
+
+  // Activate the flag 'mUserHasActivatedInteraction' by specific user gestures.
+  void ActivateByUserGesture();
+  void MaybeActivateByUserGesture(nsIPrincipal* aPrincipal);
+
   // Helpers for GetElementsByName.
   static bool MatchNameAttribute(mozilla::dom::Element* aElement,
                                  int32_t aNamespaceID,
diff --git a/dom/events/EventStateManager.cpp b/dom/events/EventStateManager.cpp
index bca3d57e8663..66b686dcf302 100644
--- a/dom/events/EventStateManager.cpp
+++ b/dom/events/EventStateManager.cpp
@@ -922,14 +922,6 @@ EventStateManager::NotifyTargetUserActivation(WidgetEvent* aEvent,
              aEvent->mMessage == eMouseUp ||
              aEvent->mMessage == eTouchEnd);
   doc->NotifyUserActivation();
-
-  // Activate parent document which has same principle on the parent chain.
-  nsCOMPtr<nsIPrincipal> principal = doc->NodePrincipal();
-  nsCOMPtr<nsIDocument> parent = doc->GetSameTypeParentDocument();
-  while (parent) {
-    parent->MaybeNotifyUserActivation(principal);
-    parent = parent->GetSameTypeParentDocument();
-  }
 }
 
 void
diff --git a/dom/webidl/Document.webidl b/dom/webidl/Document.webidl
index 8d2a7ac085db..40422518f530 100644
--- a/dom/webidl/Document.webidl
+++ b/dom/webidl/Document.webidl
@@ -445,6 +445,13 @@ partial interface Document {
   [ChromeOnly] readonly attribute boolean userHasInteracted;
 };
 
+// Extension to give chrome JS the ability to simulate activate the docuement
+// by user gesture.
+partial interface Document {
+  [ChromeOnly]
+  void notifyUserActivation();
+};
+
 // Extension to give chrome and XBL JS the ability to determine whether
 // the document is sandboxed without permission to run scripts
 // and whether inline scripts are blocked by the document's CSP.