> But how do they know users' phone battery level? https://developer.mozilla.org/en-US/docs/Web/API/Navigator/getBattery https://developer.mozilla.org/en-US/do

> But how do they know users' phone battery level? https://developer.mozilla.org/en-US/docs/Web/API/Navigator/getBattery https://developer.mozilla.org/en-US/docs/Web/API/Navigator/g...