title: PDF not show in div or iframe if download manager installed
body: <pre><code>&lt;iframe src="mydoc.pdf" width="600px" height="800px"&gt;&lt;/iframe&gt;
  
  
  &lt;div&gt;
  &lt;iframe src="mydoc.pdf" width="600px" height="800px"&gt;&lt;/iframe&gt;
  &lt;/div
  </code></pre>
  
  <p>above code not working if idm installed.</p>