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Override HTML5 validation

To ignore HTML validation, you can remove the attribute on button click using JavaScript.

Uer removeAttribute() to remove an attribute from each of the matched elements.

<!DOCTYPE html>
<html>
   <body>
      <form>
         First Name: <input type = "text" id = "fname" value = "Amit" required>
         <input type = "radio" onclick = "dislay('fname')"><br>
      </form>
      <script>
         function display(id) {
            document.getElementById(id).value = document.getElementById(id).removeAttribute('required');
         }
      </script>
   </body>
</html>