Is there any way of passing additional data via custom events?

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Yes, you can use a MessageEvent or a CustomEvent.

Example usage:

//Listen for the event
window.addEventListener("MyEventType", function(evt) {
    alert(evt.detail);
}, false);

//Dispatch an event
var evt = new CustomEvent("MyEventType", {detail: "Any Object Here"});
window.dispatchEvent(evt);

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