#import // https://www.w3.org/TR/css-animations-1/#animationevent [Exposed=Window] interface AnimationEvent : Event { constructor(CSSOMString type, optional AnimationEventInit animationEventInitDict = {}); readonly attribute CSSOMString animationName; readonly attribute double elapsedTime; readonly attribute CSSOMString pseudoElement; }; // https://www.w3.org/TR/css-animations-1/#dictdef-animationeventinit dictionary AnimationEventInit : EventInit { CSSOMString animationName = ""; double elapsedTime = 0.0; CSSOMString pseudoElement = ""; };