Why might this Battery Status API code not work in some modern browsers?
if ('getBattery' in navigator) {
navigator.getBattery().then(battery => {
updateBatteryStatus(battery);
battery.addEventListener('levelchange', () => {
updateBatteryStatus(battery);
});
battery.addEventListener('chargingchange', () => {
updateBatteryStatus(battery);
});
});
} else {
console.log('Battery Status API not supported');
}
function updateBatteryStatus(battery) {
console.log(`Battery level: ${battery.level * 100}%`);
console.log(`Battery charging: ${battery.charging ? 'Yes' : 'No'}`);
console.log(`Battery charging time: ${battery.chargingTime} seconds`);
console.log(`Battery discharging time: ${battery.dischargingTime} seconds`);
}
This Battery Status API code might not work because it's been deprecated in many browsers: 1) The Battery Status API (navigator.getBattery()) was initially introduced to allow websites to adapt to battery conditions, 2) Researchers demonstrated that it could be used for fingerprinting users and tracking without permission, 3) Due to these privacy concerns, Firefox and other browsers have removed or restricted the API, 4) Chrome still supports it but requires a secure context (HTTPS), 5) The code correctly includes feature detection with 'getBattery' in navigator, which helps handle browsers without support, 6) The API provides detailed information that could be valuable for power-sensitive applications, 7) Alternative approaches include using more generic power-saving indicators like navigator.connection.saveData, 8) This illustrates how browser APIs can be restricted or removed when privacy implications are discovered.