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<!DOCTYPE html> <html> <body> <p>This example uses the addEventListener() method to attach a "beforeprint" event to the window object.</p> <h1>Try to print this document</h1> <p><b>Tip:</b> Keyboard shortcuts, such as Ctrl+P sets the page to print.</p> <p><b>Note:</b> The beforeprint event is only supported in Internet Explorer and Firefox. </p> <script> window.addEventListener("beforeprint", myFunction); function myFunction() { alert("You are about to print this document!"); } </script> </body> </html>