Breakouts of the WebVR specification for embedding

webvr.Navigator.webidl

partial interface Navigator
{
  Promise<sequence<VRDevice>> getVRDevices();
}

webvr.tieHDMToSensors.js

var gHMD, gPositionSensor;

navigator.getVRDevices().then(function(devices) {
  for (var i = 0; i < devices.length; ++i) {
    if (devices[i] instanceof HMDVRDevice) {
      gHMD = devices[i];
      break;
    }
  }

  if (gHMD) {
    for (var i = 0; i < devices.length; ++i) {
      if (devices[i] instanceof PositionSensorVRDevice && devices[i].hardwareUnitId === gHMD.hardwareUnitId) {
        gPositionSensor = devices[i];
        break;
      }
    }
  }
});