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.


var beta = instanceOfDeviceOrientationEvent.beta;


Specification Status Comment
Device Orientation Events Working Draft Initial specification.

Browser compatibility

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

Document Tags and Contributors

 Contributors to this page: fscholz, MHasan, teoli, kscarfone, Jeremie, Sheppy, kohei.yoshino
 Last updated by: fscholz,