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<!DOCTYPE html> <html> <head> <script> function writeMessage() { document.forms[0].mySecondInput.value = document.forms[0].myInput.value; } </script> </head> <body> <p>The onkeyup event occurs when the a keyboard key is on it's way UP.</p> <form> Enter your name: <input type="text" name="myInput" onkeyup="writeMessage()" size="20"> <input type="text" name="mySecondInput" size="20"> </form> </body> </html>