1 files changed, 6 insertions, 6 deletions
diff --git a/dom/webidl/DeviceMotionEvent.webidl b/dom/webidl/DeviceMotionEvent.webidl
index fa4ecf3ca3..c26ab080c7 100644
--- a/dom/webidl/DeviceMotionEvent.webidl
+++ b/dom/webidl/DeviceMotionEvent.webidl
@@ -48,10 +48,10 @@ dictionary DeviceMotionEventInit : EventInit {
 // Mozilla extensions.
 partial interface DeviceMotionEvent {
   void initDeviceMotionEvent(DOMString type,
-                             boolean canBubble,
-                             boolean cancelable,
-                             DeviceAccelerationInit acceleration,
-                             DeviceAccelerationInit accelerationIncludingGravity,
-                             DeviceRotationRateInit rotationRate,
-                             double? interval);
+                             optional boolean canBubble = false,
+                             optional boolean cancelable = false,
+                             optional DeviceAccelerationInit acceleration,
+                             optional DeviceAccelerationInit accelerationIncludingGravity,
+                             optional DeviceRotationRateInit rotationRate,
+                             optional double? interval = null);
 };