This enumerates the window to find types that inherit from EventTarget.

FilterEventTargets.js

		var eventTargetObjects = Object.getOwnPropertyNames(window).filter(function prop(name) {
			// This block of code identifies constructors with high confidence using casing, enumerability and prototype property presence
			return (name[0] === name[0].toUpperCase() && !this.propertyIsEnumerable(name) && this[name].prototype !== undefined);
		}, window).filter(function prop(name) {
			// This block of code determines if a constructor is like an EventTarget
			var currentPrototype = this[name].prototype;
			while (currentPrototype !== null) {
				if (currentPrototype === EventTarget.prototype) {
					return true;
				}
				currentPrototype = Object.getPrototypeOf(currentPrototype);
			}
			return false;
		}, window);