Email Validation under Form validation in Javascript

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<!DOCTYPE html>
<html lang="en" id="hello">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title> Email Validation under Form validation in Javascript</title>
  <link rel="stylesheet" href="latesttest.css">
</head>
<body>
      <form onsubmit=" return validation()">

          EMAIL ID <input id="user" type="email" placeholder="EMAIL ID" required><br><br>
          PASSWORD <input id="pass" type="password" placeholder="PASSWORD"><br><br>
          <button type="submit">SUBMIT</button>

      </form>
<script>

function validation()
{
  var v = document.getElementById("user").value; 
  var a = v.indexOf("@");
  var b = v.lastIndexOf(".");
  var c = v.indexOf(".")-v.indexOf("@") ;
  
  alert("VALUE OF A: " + a + "value of B : " +  b + "value of c : " + c)-2;
  
  if( a<1 || b<2 || c<=2 )
    return false;
  
  else
  return true;
}


</script>
</div>
</body>
</html> 
 
 
 

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