XRReferenceSpaceEventInit.referenceSpace

The XRReferenceSpaceEventInit property referenceSpace is used to establish the value of a newly-constructed XRReferenceSpaceEvent object when calling the XRReferenceSpaceEvent() constructor.

let eventInitDict = {
  referenceSpace: xrReferenceSpace,
  transform: xrRigidTransform
});

An XRReferenceSpace indicating the source of the event.

This simple snippet calls the constructor to create a new reference space event of type reset.

let refSpaceEvent = new XRReferenceSpaceEvent("reset", {
      referenceSpace: myRefSpace,
      transform: myTransform
});