How can one prevent accidental closure of a Lightbox/Milkbox window in PHP scripts?

To prevent accidental closure of a Lightbox/Milkbox window in PHP scripts, you can use JavaScript to detect when the user tries to close the window and prompt them with a confirmation message before allowing the closure. 

<script type="text/javascript">
    window.onbeforeunload = function() {
        return "Are you sure you want to leave this page?";
    };
</script>

Keywords

Lightbox Milkbox prevent accidental closure PHP scripts

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