<form>
<fieldset>
<legend>个人信息采集:</legend>
请输入你的用户名:<br>
<input type="text" name="username">
<br>
请输入你的性别:<br>
<input type="text" name="sex">
<input type="submit" value="提交">
</fieldset>
</form>
<br/>
<form>
<input type="radio" name="sex" value="girl" checked>girl
<br>
<input type="radio" name="sex" value="boy">boy
</form>