sandbox-mandatory-flags-iframe.sub.html

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<!DOCTYPE html>

<title>Iframe content to load a fenced frame and report a value to the server</title>

<script src="utils.js"></script>

<body>

<script>

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

  fencedframe.config = new FencedFrameConfig(

      generateURL("sandbox-mandatory-flags-inner.sub.html?key={{GET[key]}}" +

          "&value={{GET[value]}}", []));

  document.body.appendChild(fencedframe);

</script>

</body>