Hidden Controls in HTML Forms

In HTML hidden form controls are used to hide data inside the page which later on can be pushed to the server. This control hides inside the code and does not appear on the actual page. For example, following hidden form is being used to keep current page number. When a user will click next page then the value of hidden control will be sent to the web server and there it will decide which page will be displayed next based on the passed current page.
<!DOCTYPE html>
   <title>Hidden Form Control</title>
      <form action="login_page.php" method="post">
         <p>This is page 100</p>
         <input type = "hidden" name = "pagename" value = "100" />
         <input type = "submit" name = "submit" value = "Submit" />
         <input type = "reset" name = "reset"  value = "Reset" />
The output of above code will be :

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