What is a legitimate use case for a web page to know my battery status?
Battery level and time remaining can be used to fingerprint users.
A mobile webapp might use battery level to throttle its activity, but
that could be something the OS handles by pausing or throttling apps
directly or broadcasting app lifecycle events. I can't think of a good
reason why a web page in a browser, especially on a desktop OS, needs to
know anything about my battery.
http://www.theguardian.com/technology/2015/aug/03/privacy-smartphones-battery-life
http://eprint.iacr.org/2015/616.pdf
chris
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