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<!DOCTYPE html> <html> <body> <form action="demo_form.asp" method="get"> E-mail: <input type="email" name="userid"><br> <button id="myBtn" type="submit" formnovalidate>Submit</button> </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("myBtn").formNoValidate = false; document.getElementById("demo").innerHTML = "The formnovalidate attribute in the submit button is no longer present, and the form-data will now be validated on submission."; } </script> </body> </html>