51help TIY
码：
<!DOCTYPE HTML> <html> <body> <form action="http://www.51help.tk/example/html5/demo_form.asp" method="get" id="secureform"> Username: <input type="text" name="usr_name" /> Encryption: <keygen name="security" /> <input type="submit" /> </form> </body> </html>
查看结果: