<html>
<head></head>
<body>
<p>This page injects a srcdoc frame with a nested form iframe.
<div id="myDiv"></div>
<script>
var iframeHtml =
'<iframe srcdoc="<iframe src=\'form.html\'><\/iframe>"><\/iframe>';
// Create an iframe srcdoc with nested frame inside the preexisting div.
document.getElementById('myDiv').innerHTML = iframeHtml;
</script>
</body>
</html>