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Enter the era when every website wants camera permissions ...

Or maybe there is some other sensor you could use? Like if photoelectric effect triggered some noise in your microphone or slightly more TCP retransmissions some such



Most devices have a built-in ambient light sensor:

https://en.wikipedia.org/wiki/Ambient_light_sensor


What do you mean "most"? Maybe the phones, but PCs rarely have them. Outside macbooks, I only have seen one PC with a light sensor.


I meant most mobile devices. I think my TV has one as well.




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