<!DOCTYPE html>
<html>
<body>
<form action="demo_form.asp" method="get">
E-mail: <input type="email" name="userid"><br>
<input type="submit" id="mySubmit" value="Submit" formnovalidate>
</form>
<p>Click the "Try it" button to specify that the form-data above should be validated on submission.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
document.getElementById("mySubmit").formNoValidate = false;
document.getElementById("demo").innerHTML = "The formnovalidate attribute in the input element with type='submit' is no longer present, and the form-data will now be validated on submission.";
}
</script>
</body>
</html>