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<!DOCTYPE html> <html> <body> <p>Enter data and submit the form.</p> <form id="myForm" action="post.php"> First name: <input type="text" name="fname"><br> Last name: <input type="text" name="lname"><br><br> <input type="button" id="btn" onclick="submitForm()" value="Submit form"> </form> <script> function submitForm() { document.getElementById(“myForm").submit(); document.getElementById("btn").disabled = true; } </script> </body> </html>