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

[Constructor(optional SensorOptions options), SecureContext, Exposed=Window]
interface LinearAccelerationSensor : Accelerometer {
};

[Constructor(optional SensorOptions options), SecureContext, Exposed=Window]
interface GravitySensor : Accelerometer {
};