Definition
WebXR Device API defines XRVisibilityMaskChangeEvent
[SecureContext, Exposed=Window]
interface XRVisibilityMaskChangeEvent : Event {
constructor(DOMString type, XRVisibilityMaskChangeEventInit eventInitDict);
[SameObject] readonly attribute XRSession session;
readonly attribute XREye eye;
readonly attribute unsigned long index;
[SameObject] readonly attribute Float32Array vertices;
[SameObject] readonly attribute Uint32Array indices;
};