This test dumps all of the properties that are reachable from the window.DeviceMotionEvent window.ondevicemotion, window.DeviceOrientationEvent and window.ondeviceorientation objects, along with their types. These properties are currently enabled by a runtime flag.

window.DeviceMotionEvent [function]
window.ondevicemotion [null]
window.DeviceOrientationEvent [function]
window.ondeviceorientation [null]