#import <DOM/Event.idl>

// https://dom.spec.whatwg.org/#interface-customevent
[Exposed=*]
interface CustomEvent : Event {
    constructor(DOMString type, optional CustomEventInit eventInitDict = {});

    readonly attribute any detail;

    undefined initCustomEvent(DOMString type, optional boolean bubbles = false, optional boolean cancelable = false, optional any detail = null); // legacy
};

dictionary CustomEventInit : EventInit {
    any detail = null;
};