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The alpha read-only property of the DeviceOrientationEvent interface returns the rotation of the device around the Z axis; that is, the number of degrees by which the device is being twisted around the center of the screen. See Orientation and motion data explained for details.
A number.
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
alpha |
7 | 12 | 6 | 15 | 17 | 18 | 6 | 14 | 4.2 | 1.0 | 3 | 4.2 |
deviceorientation eventdeviceorientationabsolute event
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https://developer.mozilla.org/en-US/docs/Web/API/DeviceOrientationEvent/alpha