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<!DOCTYPE html> <html> <body onbeforeprint="myFunction()"> <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 onbeforeprint event is not supported in Safari and Opera.</p> <script> function myFunction() { alert("You are about to print this document!"); } </script> </body> </html>
