dom/indexedDB/test/third_party_iframe1.html

<!--
  Any copyright is dedicated to the Public Domain.
  http://creativecommons.org/publicdomain/zero/1.0/
-->
<html>
<head>
  <title>Indexed Database Test</title>

  <script type="text/javascript;version=1.7">
    function messageListener(event) {
      let message = eval(event.data);

      if (message.source == "parent") {
        document.getElementById("iframe2").src = message.href;
      }
      else if (message.source == "iframe") {
        parent.postMessage(event.data, "*");
      }
    }
  </script>

</head>

<body onload="window.addEventListener('message', messageListener, false);">
  <iframe id="iframe2"></iframe>
</body>

</html>