[1] [CITE@en[DeviceOrientation Event Specification]]
( ([TIME[2011-06-28 16:41:24 +09:00]] 版))
<http://www.w3.org/TR/2011/WD-orientation-event-20110628/>

[2] [CITE@en[DeviceOrientation Event Specification]]
( ([TIME[2011-12-01 22:34:51 +09:00]] 版))
<http://www.w3.org/TR/2011/WD-orientation-event-20111201/>