Object doesn't support this action IE9 with CustomEvent Initialization

Question

I am getting the following error in IE9:

\"Object doesn\'t support this action\".

There are various question about this, but mine is specifically for the followi

Answer 1

The following polyfill would not replacce native CustomEvent(),
Partial source from: MDN CustomEvent():

(function () {

  if (typeof CustomEvent === 'function') { return; }

  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;
})();