dictionary CookieChangeEventInit : EventInit {
    CookieList changed;
    CookieList deleted;
};

// https://cookiestore.spec.whatwg.org/#cookiechangeevent
[Exposed=Window, SecureContext]
interface CookieChangeEvent : Event {
    constructor(DOMString type, optional CookieChangeEventInit eventInitDict = {});
    [SameObject, CachedAttribute] readonly attribute FrozenArray<CookieListItem> changed;
    [SameObject, CachedAttribute] readonly attribute FrozenArray<CookieListItem> deleted;
};