JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Register</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-5">
<link rel="stylesheet" type="text/css" href="style1.css" />
<link rel="stylesheet" type="text/css" href="forms.css" />

 <script src="http://code.jquery.com/jquery-latest.js"></script>
  <script type="text/javascript" src="http://dev.jquery.com/view/trunk/plugins/validate/jquery.validate.js"></script>

    <script type="text/javascript">
    $(document).ready(function() {
      $("#registerform").validate({
        rules: {
          username: "required",
          firstname: "required", 
          email: {// compound rule
          required: true,
          passwd: true,
          email: true,
        },
        },
        
      });
    });
  </script>

<style type="text/css">

label { width: 10em; float: left; }
label.error { float: none; color: red; padding-left: .5em; vertical-align: top; }
p { clear: both; }
.submit { margin-left: 12em; }
em { font-weight: bold; padding-right: 1em; vertical-align: top; }
</style>
 </head>

<body>

Please register below
<p />
                <form action=" " id="registerform" method="POST">


        <table cellspacing="9">
         <tr><td><b>Username:</b></td><td><input type="text" name="username"  size="30"></td></tr>
         <tr><td><b>First name:</b></td><td><input type="text" name="firstname"  size="30"/></td></tr>
         <tr><td><b>Surname:</b>   </td><td><input type="text" name="lastname" size="30"/></td></tr>
         <tr><td><b>Email  : </b>  </td><td><input type="text" name="email" size="30"/></td></td></tr>
         <tr><td><b>Password :</b> </td><td><input type="password" name="passwd" size="30"/></td></tr>

         <tr><td><b>Telephpone:</b></td><td><input type="text" name="telephone" size="30"/></td></td></tr>
         <tr><td><b>House No:</b></td><td><input type="text" name="ad1"...