VALDATION IN JAVASCRIPT
 <!DOCTYPE html> <html> </html>  <head>     <title>         Simple HTML webpage with CSS style     </title> <script> function validation() { var name=document.form["regform"]["name"]; if(name.value==null||name.value=="") {  alert("name cant be blank");  return false; } </script>       <!-- Stylesheet of web page -->     <style>         body {             text-align: center;         }           h1 {             color: green;         }     </style> </head>   <body>     <h1><form name="regform" onsubmit="return validation()" method="post"> name:<input type="text" name="name"> <input type="submit"> </form></h1>     ...