Returns the rotation of the device around the X axis; that is, the number of degrees, ranged between -180 and 180, by which the device is tipped forward or backward. See Orientation and motion data explained for details. Syntax var beta = instanceOfDeviceOrientationEvent.beta; Specifications Specification Status Comment Device Orientation Events Working Draft Initial specification. Browser compatibility Desktop Mobile Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit) Basic support 7.0 6 [1] ? ? ? Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Basic support 3.0 6 [1] Not supported Not supported 4.2 [1] Firefox 3.6, 4, and 5 supported mozOrientation instead of the standard DeviceOrientationEvent interface See also DeviceOrientationEvent Detecting device orientation Orientation and motion data explained window.ondeviceorientation deviceorientation