Web APIs (navigator, geolocation, history)

To detect battery-saving mode, you would use navigator.connection: 1) The Network Information API, accessed via navigator.connection or navigator.mozConnection or navigator.webkitConnection, provides information about the device's connection, 2) The saveData property indicates whether the user has requested a reduced data usage mode, which often correlates with power-saving modes, 3) This is typically enabled in battery-saving modes on mobile devices, 4) While there's no direct API for detecting all power-saving modes across all platforms, the saveData attribute is the closest standardized indicator, 5) This API also provides other useful information like connection type (wifi, cellular, etc.) and effective bandwidth estimates, 6) Support varies across browsers, so feature detection is necessary before using it, 7) The Battery Status API (navigator.getBattery()) was once proposed for this purpose but has been deprecated in many browsers due to privacy concerns, 8) Adapting content based on these signals enables building more power-efficient web applications.