<!DOCTYPE html>
<html>
<body>
<iframe srcdoc="<p>Hello world!</p>" src="/demo/demo_iframe_srcdoc.html">
<p>Your browser does not support iframes.</p>
</iframe>
<p><b>注释：</b>所有主流浏览器都支持 srcdoc 属性，除了 Internet Explorer。</p>
</body>
</html>