password_form_in_crosssite_iframe.html

<html>
<body id="inParent">

<script>
  function sendMessage(msg) {
    return new Promise(resolve => {
      window.addEventListener(
          "message",
          (event) => resolve(event.data),
          {once: true});
      document.getElementById("iframe").contentWindow.postMessage(msg,"*");
    });
  }

  function create_iframe(src) {
    var ifrm = document.createElement("IFRAME");
    ifrm.setAttribute("id", "iframe");
    ifrm.setAttribute("name", "iframe");
    ifrm.setAttribute("src", src);
    document.body.appendChild(ifrm);
  }
</script>

</body>
</html>

chromium/chrome/test/data/password/password_form_in_crosssite_iframe.html