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<html><body><p>Click the "Submit" button to submit the form.</p><form onsubmit="myFunction()" action="/action_page.php"> Firstname: <input type="text" name="fname" value="Donald"><br> Lastname: <input type="text" name="lname" value="Duck"><br><br> <input type="submit" value="Submit"></form><script>function myFunction() { alert("The form will be submitted");}</script></body></html>