#import // https://www.w3.org/TR/web-animations-1/#animationplaybackevent [Exposed=Window] interface AnimationPlaybackEvent : Event { constructor(DOMString type, optional AnimationPlaybackEventInit eventInitDict = {}); readonly attribute double? currentTime; readonly attribute double? timelineTime; }; // https://www.w3.org/TR/web-animations-1/#dictdef-animationplaybackeventinit dictionary AnimationPlaybackEventInit : EventInit { double? currentTime = null; double? timelineTime = null; };