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Detecting device orientation

Increasingly, web-enabled devices are capable of determining their orientation; that is, they can report data indicating changes to their orientation with relation to the pull of gravity. In particular, hand-held devices such as mobile phones can use this information to automatically rotate the display to remain upright, presenting a wide-screen view of the web content when the device is rotated so that its width is greater than its height.
API Device Orientation Firefox OS Intermediate Mobile Motion Orientation Reference

DeviceMotionEvent.acceleration

The acceleration property returns the amount of acceleration recorded by the device, in meters per second squared (m/s2).
API Device Orientation Firefox OS Mobile Motion NeedsExample Orientation Property

DeviceMotionEvent.accelerationIncludingGravity

The accelerationIncludingGravity property returns the amount of acceleration recorded by the device, in meters per second squared (m/s2). Unlike DeviceMotionEvent.acceleration which compensates for the influence of gravity, its value is the sum of the acceleration of the device as induced by the user and the acceleration caused by gravity.
API Device Orientation Firefox OS Mobile Motion NeedsExample Orientation Property

DeviceMotionEvent.interval

Returns the interval, in milliseconds, at which data is obtained from the underlaying hardware. You can use this to determine the granularity of motion events.
API Device Orientation Firefox OS Mobile Motion NeedsExample Orientation Property

DeviceMotionEvent.rotationRate

Returns the rate at which the device is rotating around each of its axes in degrees per second.
API Device Orientation DOM DOM Reference Firefox OS Mobile Motion NeedsExample Orientation Property Reference