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<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
</head>
<body>
  <iframe id="nestframe"></iframe>
<script>
  let nestframe = document.getElementById("nestframe");

  window.addEventListener("message", (event) => {
    parent.postMessage(event.data, "*");

    // Only create second iframe once
    if(event.data.type === "https") {
      return;
    }

    nestframe.contentDocument.body.innerHTML = `
        <iframe id="frametwo"
          src=\"https://example.com\"
          onload=\"parent.postMessage({status:'loaded', type: 'https'}, '*')\"
          onerror=\"parent.postMessage({status:'blocked', type: 'https'}, '*')\"
        ></iframe>`;
  });

  nestframe.onload = (event) => {
    nestframe.contentDocument.body.innerHTML = `
      <iframe id="frameone"
        src=\"http://example.com\"
        onload=\"parent.postMessage({status:'loaded', type: 'http'}, '*')\"
        onerror=\"parent.postMessage({status:'blocked', type: 'http'}, '*')\"
      ></iframe>`;
  }

  nestframe.src = "about:blank";
</script>
</body>
</html>