// https://drafts.csswg.org/web-animations-2/#animationplaybackevent
[Exposed=Window]
interface AnimationPlaybackEvent : Event {
    constructor(DOMString type, optional AnimationPlaybackEventInit eventInitDict = {});
    readonly attribute CSSNumberish? currentTime;
    readonly attribute CSSNumberish? timelineTime;
};

// https://drafts.csswg.org/web-animations-2/#dictdef-animationplaybackeventinit
dictionary AnimationPlaybackEventInit : EventInit {
    CSSNumberish? currentTime = null;
    CSSNumberish? timelineTime = null;
};