DeviceOrientationEvent: alpha property
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2023.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
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.