How do you test from a web app if the screen is off?

I made small test app that reads the GPS regularly, however, judging by power 
consumption, it was still busy reading the GPS and updating its UI while the 
screen was off.

I spotted that behavior in both FireFox OS and FireFox for Android (this was a 
regular web app, loaded from the web).

Assuming the above isn't a bug and that the browser shouldn't have put my app 
to sleep on its own, is there an equivalent to the PowerManager WebAPI that 
would give read-only access to screen on/off state, but without requiring 
permissions?

Ideally I would need an event to put everything to sleep and another to wake 
the UI.

Eric
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