interface mixin InvokerElement {
  [CEReactions,Reflect=invoketarget] attribute Element? invokeTargetElement;
  [CEReactions,Reflect,ReflectMissing="auto",ReflectEmpty="auto"] attribute DOMString invokeAction;
};

interface InvokeEvent : Event {
    constructor(DOMString type, optional InvokeEventInit eventInitDict = {});
    readonly attribute Element? invoker;
    readonly attribute DOMString action;
};

dictionary InvokeEventInit : EventInit {
    Element? invoker = null;
    DOMString action = "auto";
};