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On mobile devices, the text-size-adjust property allows Web authors to control if and how the text-inflating algorithm is applied to the textual content of the element it is applied to.
CSS CSS Mobile Text Size Adjustment CSS Property Experimental NeedsExample Reference

Battery Status API

The Battery Status API, more often referred to as the Battery API, provides information about the system's battery charge level and lets you be notified by events that are sent when the battery level or charging status change. This can be used to adjust your app's resource usage to reduce battery drain when the battery is low, or to save changes before the battery runs out in order to prevent data loss.
API Apps Battery Battery API Battery Status API Firefox OS Guide Mobile Overview

The call read-only property of the CallEvent interface returns a TelephonyCall object indicating the call from which the event originated.
API B2G Call CallEvent Event Firefox OS Mobile Non-standard Property Reference Référence Telephony WebAPI


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