iframe1_bug1640766.html

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<!DOCTYPE HTML>

<html>

<head>

<title>Iframe 1 for Bug 1640766</title>

</head>

<body>

<div>Iframe 1</div>

<script type="application/javascript">

if (parent == window) {

  let iframe = document.createElement("iframe");

  iframe.src = "http://example.org/tests/dom/base/test/iframe2_bug1640766.html";

  document.body.appendChild(iframe);

} else {

  window.onload = function() {

    top.opener.postMessage("ready", "*");

};

</script>

</body>

</html>