Definition
WebXR Device API defines XRReferenceSpaceEvent
[SecureContext, Exposed=Window]
interface XRReferenceSpaceEvent : Event {
constructor(DOMString type, XRReferenceSpaceEventInit eventInitDict);
[SameObject] readonly attribute XRReferenceSpace referenceSpace;
[SameObject] readonly attribute XRRigidTransform? transform;
};