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The API is only supported in Chromium browsers [0]. It was removed from Firefox and Safari. https://developer.mozilla.org/en-US/docs/Web/API/Battery_Status_API

• zimpenfish 3y ago
  Somewhat disappointed in macOS for giving the information to Chrome. I'd figure that to be the kind of sensor you need a special entitlement to read (but it may well be tricky to enforce.)
  • internetter 3y ago
    Some browsers activate a low power mode when your battery reaches a certain threshold
    • zimpenfish 3y ago
      That should probably come from the OS as a power management event ("low power mode: on") rather than the browser being able to read the battery state directly and making its own decisions, surely.
      • internetter 3y ago
        Probably, yeah