title: Why does this throw an exception in IE 11
body: <p>Why does the following  code throw an 'Unspecified error' (on the <code>appendChild</code> line) in Internet Explorer 11 which I click the button?</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head&gt;
      &lt;script&gt;
          function go() {
            var popUp = window.open('about:blank');
            popUp.document.body.appendChild(document.createElement('div'));
          }
      &lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;button onclick="go()"&gt;Click Me&lt;/button&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>