// https://w3c.github.io/mediacapture-main/#dictdef-mediastreamtrackeventinit
dictionary MediaStreamTrackEventInit : EventInit {
    required MediaStreamTrack track;
};

// https://w3c.github.io/mediacapture-main/#mediastreamtrackevent
[Exposed=Window]
interface MediaStreamTrackEvent : Event {
    constructor(DOMString type, MediaStreamTrackEventInit eventInitDict);
    [SameObject] readonly attribute MediaStreamTrack track;
};
