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window.customEvent()

Pushes support back to IE9.

/**
 * CustomEvent() polyfill
 * https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent/CustomEvent#Polyfill
 */
(function () {

	if (typeof window.CustomEvent === "function") return false;

	function CustomEvent(event, params) {
		params = params || { bubbles: false, cancelable: false, detail: undefined };
		var evt = document.createEvent('CustomEvent');
		evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);
		return evt;
	}

	CustomEvent.prototype = window.Event.prototype;

	window.CustomEvent = CustomEvent;
})();