title: Full screen popup from iframe (featherlight)
body: <p>This is a very specific problem.
  There is a website (I have no access to this site) with a few iframes in it, one of these iframes is linking to a site I have access to. </p>
  
  <p>My iframe should contain a link to another iframe and open it as popup when the link is clicked. This is already working. I use <a href="https://noelboss.github.io/featherlight/" rel="nofollow noreferrer">featherlight.js</a> for this. </p>
  
  <p>The <strong>problem</strong> now is that when I click the link on the site I have no access to, <strong>the popup size is limited to the size of the iframe</strong>.</p>
  
  <hr>
  
  <p>Example for clarification</p>
  
  <p>Code on my site, let's call it <code>example.com</code></p>
  
  <pre><code>&lt;a id="popup" href="anotherlink" data-featherlight="iframe"&gt;Open popup&lt;/a&gt;
  &lt;script&gt;
      $("#popup").featherlight();
  &lt;/script&gt;
  </code></pre>
  
  <p>And the code on the site I have no access to looks like:</p>
  
  <pre><code>&lt;iframe src="example.com"&gt;&lt;/iframe&gt;
  </code></pre>