Door Sensor + Actuator example.

door.webidl

[Constructor(VehicleSensorOptions options), Exposed=(Window,Worker)]
interface VehicleSensor : Sensor {
};

dictionary VehicleSensorOptions : SensorOptions {
  VehicleZone zone;
};

interface VehiclePart : VehicleSensor {
  Promise<void> set(value);
};

interface Door : VehiclePart {
  readonly attribute DoorSensorReading? value;
};

interface DoorSensorReading : SensorReading {
  readonly attribute boolean isLocked;
};

example.js

let door = new VehicleDoor({ zone: "front left" });
door.onchange = e => {
    let status = e.isLocked ? "locked" : "unlocked";
    console.log("Front left door is now " + status);
}

/cc @acrofts84