xxxxxxxxxx<html><head><meta charset="utf-8"> <title>W3Cschool(w3cschool.cn)</title> </head><body><form action="/statics/demosource/demo-form.php" method="get"> 用户名: <input type="text" name="usr_name"> 加密: <keygen name="security"> <input type="submit"></form><p><strong>注意:</strong> Internet Explorer 不支持 keygen 标签。</p></body></html>