You can make a link in an iframe open in its parent window, if you set target="_parent".

posted on 16.12.2020

<!-- Parent File-->
<iframe src="https://codepen.io/matuzo/debug/YzGVXGV" frameborder="0"></iframe>

<!-- Embedded file -->
<ul>
  <li>
    <a href="https://a11yproject.com">no target</a>
  </li>  
  <li>
    <a href="https://a11yproject.com" target="_blank">target="_blank"</a>
  </li>
  <li>
    <a href="https://a11yproject.com" target="_parent">target="_parent"</a>
  </li>
</ul>