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<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>