title: Transparent iframe over another iframe
body: <p>What I'm trying to achieve is an iframe positioned over another iframe containing a PDF document - the first iframe should be transparent, and it should cover the iframe with PDF. I need this specifically for IE (9+).</p>
  
  <p>The code I've tried so far:</p>
  
  <pre><code>&lt;html&gt;
  &lt;head&gt;
  &lt;style&gt;
  &lt;/style&gt;
  
  &lt;/head&gt;
  &lt;body&gt;
  
  &lt;iframe src="iframeContent.html" frameborder="0" style="width: 1000px; height: 1000px; position: fixed; left:0px; top: 0px; background:transparent" allowTransparency="true"&gt;&lt;/iframe&gt;
  
  &lt;iframe src='http://www.pdf995.com/samples/pdf.pdf' width="100%" height="300px" id="PDF" name="PDF"&gt;&lt;/iframe&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>iframeContent.html:</p>
  
  <pre><code>&lt;html&gt;
  &lt;style type="text/css"&gt;
  
  &lt;/style&gt;
  
  &lt;body style="background: transparent"&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>However, the above doesn't work - the iframe is not transparent. Does anyone know how to solve this? As I said in the comments below, the solution posted below doesn't work with Adobe reader DC installed (if it works at all).</p>