ReadonlyalphaThe alpha read-only property of the DeviceMotionEventRotationRate interface indicates the rate of rotation around the Z axis, in degrees per second.
ReadonlybetaThe beta read-only property of the DeviceMotionEventRotationRate interface indicates the rate of rotation around the X axis, in degrees per second.
ReadonlygammaThe gamma read-only property of the DeviceMotionEventRotationRate interface indicates the rate of rotation around the Y axis, in degrees per second.
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DeviceMotionEventRotationRateinterface of the Device Orientation Events provides information about the rate at which the device is rotating around all three axes. Available only in secure contexts.MDN Reference