File: load-into-the-iframe.html

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
  </head>
  <body>
    <iframe sandbox="allow-scripts"></iframe>
    <script>
      let frame = document.querySelector("iframe");
      let sandbox = new URL(location.href).searchParams.get("sandbox");
      if (sandbox) {
        frame.sandbox = sandbox;
      }
      // We're the popup (i.e. a top frame).  Load into the iframe the page
      // trying to modifying the top frame and transmit the result to our
      // opener.
      onmessage = function(e) {
        opener.postMessage(e.data, "*")
      }
      frame.src = "iframe-that-performs-top-navigation-on-popup.html";
    </script>
  </body>
</html>