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Result Size: 625 x 565
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<!DOCTYPE html>
<html>
<body>
​
<p>This example uses the HTML DOM to assign an "onbeforeprint" event to a body element.</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 onbeforeprint event is not supported in Safari and Opera. </p>
<script>
document.getElementsByTagName("BODY")[0].onbeforeprint = function() {myFunction()};
​
function myFunction() {
  alert("You are about to print this document!");
}
</script>
​
</body>
​
</html>
​
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