title: Object doesn't support this action IE9 with CustomEvent Initialization
body: <p>I am getting the following error in IE9:</p>
  <blockquote>
  <p>&quot;Object doesn't support this action&quot;.</p>
  </blockquote>
  <p>There are various question about this, but mine is specifically for the following code:</p>
  <pre><code> var myEvent = new CustomEvent(&quot;additem&quot;);
  </code></pre>
  <p>From my understanding, <code>CustomEvent</code> is supported in IE9 as a DOM manipulation command. This works fine in Chrome without any exception.</p>
  <p>Anyone has this problem and know how to solve it? Thanks.</p>