fieldset必须是一种形式吗？

<form>
 <fieldset>
   <legend>个人信息</legend>
   <label for="name">姓名：</label>
   <input type="text" id="name" name="name"><br>

   <label for="email">电子邮件：</label>
   <input type="email" id="email" name="email">
  </fieldset>

 <fieldset>
   <legend>选择你的兴趣爱好</legend>
   <input type="checkbox" id="hobby1" name="hobby1" value="Music">
   <label for="hobby1">音乐</label><br>

   <input type="checkbox" id="hobby2" name="hobby2" value="Sports">
   <label for="hobby2">体育</label>
  </fieldset>

 <input type="submit" value="提交">
</form>