The DeviceMotionEventRotationRate.alpha read-only property indicates the rate of rotation around the Z axis, in degrees per second.
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DeviceMotionEventRotationRate: alpha property
Value
A double indicating the rate of rotation around the Z axis, in degrees per second. See Accelerometer values explained for details.
Specifications
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
alpha | 
       31 | 12 | 6 | 11 | 18 | No | 4.4.3 | 31 | 6 | 18 | 4.2 | 2.0 | 
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 https://developer.mozilla.org/en-US/docs/Web/API/DeviceMotionEventRotationRate/alpha