echoing-nester.html | Explore in Territory

<body>
  <script>
    window.addEventListener('message', m => {
      window.parent.postMessage(m.data, '*');
    });

    var u = new URL(window.location.href);
    var origin = u.searchParams.has('origin') ? u.searchParams.get('origin') : window.origin;
    var file = u.searchParams.has('file') ? u.searchParams.get('file') : 'passwordcredential-get.html';

    var url = origin + "/credentialmanagement/resources/" + file;
    var i = document.createElement('iframe');
    i.src = url;
    document.body.appendChild(i);
  </script>
</body>

chromium/third_party/blink/web_tests/http/tests/credentialmanagement/resources/echoing-nester.html