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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>
<form action="demo_form.php">
Username: <input type="text" name="usrname" maxlength="10"><br>
<input type="submit" value="提交">
</form>
</body>
</html>