nested_iframe.html

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<!DOCTYPE html>

<html>

<head>

  <meta charset="utf-8">

  <title>Form Autofill With Remote IFrame Demo Page</title>

</head>

<body>

  <script>

    const params = new URLSearchParams(window.location.search);

    const iframeSrc = params.get("iframe");

    if (iframeSrc) {

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

      iframe.src = iframeSrc;

      document.body.appendChild(iframe);

    } else {

      document.body.textContent = "Missing iframe query parameter.";

  </script>

</body>

</html>