--- a/content/events/src/DOMWheelEvent.cpp
+++ b/content/events/src/DOMWheelEvent.cpp
@@ -27,16 +27,17 @@ DOMWheelEvent::DOMWheelEvent(EventTarget
     mEventIsInternal = false;
   } else {
     mEventIsInternal = true;
     mEvent->time = PR_Now();
     mEvent->refPoint.x = mEvent->refPoint.y = 0;
     static_cast<widget::WheelEvent*>(mEvent)->inputSource =
       nsIDOMMouseEvent::MOZ_SOURCE_UNKNOWN;
   }
+  SetIsDOMBinding();
 }
 
 DOMWheelEvent::~DOMWheelEvent()
 {
   if (mEventIsInternal && mEvent) {
     MOZ_ASSERT(mEvent->eventStructType == NS_WHEEL_EVENT,
                "The mEvent must be WheelEvent");
     delete static_cast<widget::WheelEvent*>(mEvent);
@@ -86,89 +87,121 @@ DOMWheelEvent::InitWheelEvent(const nsAS
   return NS_OK;
 }
 
 NS_IMETHODIMP
 DOMWheelEvent::GetDeltaX(double* aDeltaX)
 {
   NS_ENSURE_ARG_POINTER(aDeltaX);
 
-  *aDeltaX = static_cast<widget::WheelEvent*>(mEvent)->deltaX;
+  *aDeltaX = DeltaX();
   return NS_OK;
 }
 
 NS_IMETHODIMP
 DOMWheelEvent::GetDeltaY(double* aDeltaY)
 {
   NS_ENSURE_ARG_POINTER(aDeltaY);
 
-  *aDeltaY = static_cast<widget::WheelEvent*>(mEvent)->deltaY;
+  *aDeltaY = DeltaY();
   return NS_OK;
 }
 
 NS_IMETHODIMP
 DOMWheelEvent::GetDeltaZ(double* aDeltaZ)
 {
   NS_ENSURE_ARG_POINTER(aDeltaZ);
 
-  *aDeltaZ = static_cast<widget::WheelEvent*>(mEvent)->deltaZ;
+  *aDeltaZ = DeltaZ();
   return NS_OK;
 }
 
 NS_IMETHODIMP
 DOMWheelEvent::GetDeltaMode(uint32_t* aDeltaMode)
 {
   NS_ENSURE_ARG_POINTER(aDeltaMode);
 
-  *aDeltaMode = static_cast<widget::WheelEvent*>(mEvent)->deltaMode;
+  *aDeltaMode = DeltaMode();
   return NS_OK;
 }
 
+static void
+GetModifierList(bool aCtrl, bool aShift, bool aAlt, bool aMeta,
+                nsAString& aModifierList)
+{
+  if (aCtrl) {
+    aModifierList.AppendLiteral(NS_DOM_KEYNAME_CONTROL);
+  }
+  if (aShift) {
+    if (!aModifierList.IsEmpty()) {
+      aModifierList.AppendLiteral(" ");
+    }
+    aModifierList.AppendLiteral(NS_DOM_KEYNAME_SHIFT);
+  }
+  if (aAlt) {
+    if (!aModifierList.IsEmpty()) {
+      aModifierList.AppendLiteral(" ");
+    }
+    aModifierList.AppendLiteral(NS_DOM_KEYNAME_ALT);
+  }
+  if (aMeta) {
+    if (!aModifierList.IsEmpty()) {
+      aModifierList.AppendLiteral(" ");
+    }
+    aModifierList.AppendLiteral(NS_DOM_KEYNAME_META);
+  }
+}
+
 nsresult
 DOMWheelEvent::InitFromCtor(const nsAString& aType,
                             JSContext* aCx, JS::Value* aVal)
 {
   mozilla::idl::WheelEventInit d;
   nsresult rv = d.Init(aCx, aVal);
   NS_ENSURE_SUCCESS(rv, rv);
 
   nsAutoString modifierList;
-  if (d.ctrlKey) {
-    modifierList.AppendLiteral(NS_DOM_KEYNAME_CONTROL);
-  }
-  if (d.shiftKey) {
-    if (!modifierList.IsEmpty()) {
-      modifierList.AppendLiteral(" ");
-    }
-    modifierList.AppendLiteral(NS_DOM_KEYNAME_SHIFT);
-  }
-  if (d.altKey) {
-    if (!modifierList.IsEmpty()) {
-      modifierList.AppendLiteral(" ");
-    }
-    modifierList.AppendLiteral(NS_DOM_KEYNAME_ALT);
-  }
-  if (d.metaKey) {
-    if (!modifierList.IsEmpty()) {
-      modifierList.AppendLiteral(" ");
-    }
-    modifierList.AppendLiteral(NS_DOM_KEYNAME_META);
-  }
+  GetModifierList(d.ctrlKey, d.shiftKey, d.altKey, d.metaKey, modifierList);
 
   rv = InitWheelEvent(aType, d.bubbles, d.cancelable,
                       d.view, d.detail, d.screenX, d.screenY,
                       d.clientX, d.clientY, d.button, d.relatedTarget,
                       modifierList, d.deltaX, d.deltaY, d.deltaZ, d.deltaMode);
   NS_ENSURE_SUCCESS(rv, rv);
 
   static_cast<widget::WheelEvent*>(mEvent)->buttons = d.buttons;
 
   return NS_OK;
 }
 
+already_AddRefed<DOMWheelEvent>
+DOMWheelEvent::Constructor(const GlobalObject& aGlobal,
+                           const nsAString& aType,
+                           const WheelEventInit& aParam,
+                           mozilla::ErrorResult& aRv)
+{
+  nsCOMPtr<EventTarget> t = do_QueryInterface(aGlobal.Get());
+  nsRefPtr<DOMWheelEvent> e = new DOMWheelEvent(t, nullptr, nullptr);
+  bool trusted = e->Init(t);
+  nsAutoString modifierList;
+  GetModifierList(aParam.mCtrlKey, aParam.mShiftKey,
+                  aParam.mAltKey, aParam.mMetaKey,
+                  modifierList);
+  aRv = e->InitWheelEvent(aType, aParam.mBubbles, aParam.mCancelable,
+                          aParam.mView, aParam.mDetail,
+                          aParam.mScreenX, aParam.mScreenY,
+                          aParam.mClientX, aParam.mClientY,
+                          aParam.mButton, aParam.mRelatedTarget,
+                          modifierList, aParam.mDeltaX,
+                          aParam.mDeltaY, aParam.mDeltaZ, aParam.mDeltaMode);
+  static_cast<widget::WheelEvent*>(e->mEvent)->buttons = aParam.mButtons;
+  e->SetTrusted(trusted);
+  return e.forget();
+}
+
 } // namespace dom
 } // namespace mozilla
 
 using namespace mozilla;
 
 nsresult NS_NewDOMWheelEvent(nsIDOMEvent** aInstancePtrResult,
                              mozilla::dom::EventTarget* aOwner,
                              nsPresContext* aPresContext,

--- a/content/events/src/DOMWheelEvent.h
+++ b/content/events/src/DOMWheelEvent.h
@@ -4,16 +4,17 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #ifndef mozilla_dom_DOMWheelEvent_h__
 #define mozilla_dom_DOMWheelEvent_h__
 
 #include "nsIDOMWheelEvent.h"
 #include "nsDOMMouseEvent.h"
+#include "mozilla/dom/WheelEventBinding.h"
 
 namespace mozilla {
 namespace dom {
 
 class DOMWheelEvent : public nsDOMMouseEvent,
                       public nsIDOMWheelEvent
 {
 public:
@@ -27,14 +28,45 @@ public:
   // nsIDOMWheelEvent Interface
   NS_DECL_NSIDOMWHEELEVENT
   
   // Forward to base class
   NS_FORWARD_TO_NSDOMMOUSEEVENT
 
   virtual nsresult InitFromCtor(const nsAString& aType,
                                 JSContext* aCx, JS::Value* aVal);
+
+  static
+  already_AddRefed<DOMWheelEvent> Constructor(const GlobalObject& aGlobal,
+                                              const nsAString& aType,
+                                              const WheelEventInit& aParam,
+                                              mozilla::ErrorResult& aRv);
+
+  virtual JSObject* WrapObject(JSContext* aCx, JSObject* aScope)
+  {
+    return mozilla::dom::WheelEventBinding::Wrap(aCx, aScope, this);
+  }
+
+  double DeltaX()
+  {
+    return static_cast<widget::WheelEvent*>(mEvent)->deltaX;
+  }
+
+  double DeltaY()
+  {
+    return static_cast<widget::WheelEvent*>(mEvent)->deltaY;
+  }
+
+  double DeltaZ()
+  {
+    return static_cast<widget::WheelEvent*>(mEvent)->deltaZ;
+  }
+
+  uint32_t DeltaMode()
+  {
+    return static_cast<widget::WheelEvent*>(mEvent)->deltaMode;
+  }
 };
 
 } // namespace dom
 } // namespace mozilla
 
 #endif // mozilla_dom_DOMWheelEvent_h__

--- a/dom/bindings/Bindings.conf
+++ b/dom/bindings/Bindings.conf
@@ -1070,16 +1070,21 @@ DOMInterfaces = {
    'wrapperCache': False
 },
 
 'WebSocket': {
     'headerFile': 'WebSocket.h',
     'implicitJSContext': [ 'constructor' ]
 },
 
+'WheelEvent': {
+    'headerFile': 'DOMWheelEvent.h',
+    'nativeType': 'mozilla::dom::DOMWheelEvent',
+},
+
 'XMLHttpRequest': [
 {
     'nativeType': 'nsXMLHttpRequest',
     'implicitJSContext': [ 'constructor', ],
     'resultNotAddRefed': [ 'upload', 'responseXML' ]
 },
 {
     'workers': True,

--- a/dom/webidl/WebIDL.mk
+++ b/dom/webidl/WebIDL.mk
@@ -271,16 +271,17 @@ webidl_files = \
   TimeRanges.webidl \
   TransitionEvent.webidl \
   TreeWalker.webidl \
   UIEvent.webidl \
   URL.webidl \
   ValidityState.webidl \
   WebComponents.webidl \
   WebSocket.webidl \
+  WheelEvent.webidl \
   UndoManager.webidl \
   URLUtils.webidl \
   USSDReceivedEvent.webidl \
   XMLDocument.webidl \
   XMLHttpRequest.webidl \
   XMLHttpRequestEventTarget.webidl \
   XMLHttpRequestUpload.webidl \
   XMLSerializer.webidl \

new file mode 100644
--- /dev/null
+++ b/dom/webidl/WheelEvent.webidl
@@ -0,0 +1,33 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface please see
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Constructor(DOMString type, optional WheelEventInit eventInitDict)]
+interface WheelEvent : MouseEvent
+{
+  const unsigned long DOM_DELTA_PIXEL = 0x00;
+  const unsigned long DOM_DELTA_LINE  = 0x01;
+  const unsigned long DOM_DELTA_PAGE  = 0x02;
+
+  readonly attribute double        deltaX;
+  readonly attribute double        deltaY;
+  readonly attribute double        deltaZ;
+  readonly attribute unsigned long deltaMode;
+
+};
+
+dictionary WheelEventInit : MouseEventInit
+{
+  double deltaX = 0;
+  double deltaY = 0;
+  double deltaZ = 0;
+  unsigned long deltaMode = 0;
+};