EduCoder_web training assignment-verify the form

first round

A C D B C

Second level

 <!-- ********* Begin ******* -->
      <input type="password" maxlength="6" required="required" title="请输入不超过6位的密码！"></input>
   <!-- ********* End ********* -->

Third pass

   <!-- ********* Begin ******* -->
     <input type="email" required="required" placeholder="输入格式：xxx@xxx"></input>
   <!-- ********* End ********* -->

Fourth level

 <!-- ********* Begin ******* -->
     <input type="text" required="required" pattern="^[1-9]?[0-9]$"/>

        <!-- ********* End ********* -->

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