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<!DOCTYPE html> <html> <body> <p>Press the "O" key on the keyboard in the input field to alert some text.</p> <input type="text" size="40" onkeypress="myFunction(event)"> <p id="demo"></p> <script> function myFunction(event) { var x = event.charCode || event.keyCode; if (x == 111 || x == 79) { // o is 111, O is 79 alert("You pressed the 'O' key!"); } } </script> </body> </html>