<html>
<body>
<iframe id="myframe" src="http://ziqiangxuetang.com" longdesc="w3s.txt">
<p>Your browser does not support iframes.</p>
</iframe>
<p>The URL of the long description is:
<script>
document.write(document.getElementById("myframe").longDesc);
</script>
</p><p>
</p></body>
</html>