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<!DOCTYPE html> <html> <body> <p>Press a key on the keyboard in the input field to find out if the CTRL key was pressed or not.</p> <input type="text" onkeydown="isKeyPressed(event)"> <p id="demo"></p> <script> function isKeyPressed(event) { var x = document.getElementById("demo"); if (event.ctrlKey) { x.innerHTML = "The CTRL key was pressed!"; } else { x.innerHTML = "The CTRL key was NOT pressed!"; } } </script> </body> </html>