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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>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_onbeforeprint by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:04:14 GMT -->
</html>
​
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