This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.
PowerManager object you can use to manage the power usage of the device.
var power = window.navigator.mozPower;
navigator.mozPower is a
PowerManager object you can use to manage power usage on the device.
Not part of any specification