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.
var alpha = instanceOfDeviceOrientationEvent.alpha;
| Specification | Status | Comment |
|---|---|---|
| Device Orientation Events | Working Draft | Initial specification. |
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Basic support | 7.0 | (Yes) | 6 [1] | ? | ? | ? |
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | 3.0 | (Yes) | 6 [1] | No support | No support | 4.2 |
[1] Firefox 3.6, 4, and 5 supported mozOrientation instead of the standard DeviceOrientationEvent interface
DeviceOrientationEventwindow.ondeviceorientationdeviceorientation
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https://developer.mozilla.org/en-US/docs/Web/API/DeviceOrientationEvent/alpha