[Constructor(optional MagnetometerSensorOptions sensorOptions), SecureContext,
  Exposed=Window]
interface Magnetometer : Sensor {
  readonly attribute double? x;
  readonly attribute double? y;
  readonly attribute double? z;
};

enum LocalCoordinateSystem { "device", "screen" };

dictionary MagnetometerSensorOptions : SensorOptions {
  LocalCoordinateSystem referenceFrame = "device";
};

[Constructor(optional MagnetometerSensorOptions sensorOptions), SecureContext,
  Exposed=Window]
interface UncalibratedMagnetometer : Sensor {
  readonly attribute double? x;
  readonly attribute double? y;
  readonly attribute double? z;
  readonly attribute double? xBias;
  readonly attribute double? yBias;
  readonly attribute double? zBias;
};