>From what I know,

In FxOS,
If we have the ambient light sensor in the device, the screen_manager.js can 
add an event listener named "devicelight" to do the automatic brightness.

Once the light sensor reports the value has changed,

the code will finally go to a function "transitionBrightness".

To ensure my understanding is correct, this function will keep looping until 
the difference between the target brightness and screen brightness is smaller 
than delta. Otherwise, the system will keep adjusting the brightness in this 
function.

Is my understanding correct?

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