diff --git a/layout/base/PresShell.cpp b/layout/base/PresShell.cpp
index a69c59c13a9d..e92216f14ad9 100644
--- a/layout/base/PresShell.cpp
+++ b/layout/base/PresShell.cpp
@@ -9918,6 +9918,7 @@ PresShell::DelayedKeyEvent::DelayedKeyEvent(WidgetKeyboardEvent* aEvent) :
                             aEvent->mWidget);
   keyEvent->AssignKeyEventData(*aEvent, false);
   keyEvent->mFlags.mIsSynthesizedForTests = aEvent->mFlags.mIsSynthesizedForTests;
+  keyEvent->mFlags.mIsSuppressedOrDelayed = true;
   mEvent = keyEvent;
 }
 
diff --git a/widget/BasicEvents.h b/widget/BasicEvents.h
index 9484d3a3a1e3..2f4bf15d9f99 100644
--- a/widget/BasicEvents.h
+++ b/widget/BasicEvents.h
@@ -132,9 +132,12 @@ public:
   // Similar to mComposed. Set it to true to allow events cross the boundary
   // between native non-anonymous content and native anonymouse content
   bool mComposedInNativeAnonymousContent : 1;
-  // True if the event is suppressed or delayed. This is used when parent side
-  // process the key event after content side, parent side may drop the key
-  // event if it was suppressed or delayed in content side.
+  // Set to true for events which are suppressed or delayed so that later a
+  // DelayedEvent of it is dispatched. This is used when parent side process
+  // the key event after content side, and may drop the event if the event
+  // was suppressed or delayed in contents side.
+  // It is also set to true for the events (in a DelayedInputEvent), which will
+  // be dispatched afterwards.
   bool mIsSuppressedOrDelayed : 1;
 
   // If the event is being handled in target phase, returns true.
diff --git a/widget/PuppetWidget.cpp b/widget/PuppetWidget.cpp
index aa4e5bb3e670..c877cb36c5b4 100644
--- a/widget/PuppetWidget.cpp
+++ b/widget/PuppetWidget.cpp
@@ -326,7 +326,8 @@ PuppetWidget::DispatchEvent(WidgetGUIEvent* event, nsEventStatus& aStatus)
              "Unexpected event dispatch!");
 
   AutoCacheNativeKeyCommands autoCache(this);
-  if (event->mFlags.mIsSynthesizedForTests && !mNativeKeyCommandsValid) {
+  if ((event->mFlags.mIsSynthesizedForTests ||
+       event->mFlags.mIsSuppressedOrDelayed) && !mNativeKeyCommandsValid) {
     WidgetKeyboardEvent* keyEvent = event->AsKeyboardEvent();
     if (keyEvent) {
       mTabChild->RequestNativeKeyBindings(&autoCache, keyEvent);