I often accidentally close my Chrome browser and have to reopen and reload all the tabs that I'd been working on. Since Chrome does not a have built in confirm before closing mechanism, I wrote a simple page to ask for confirmation before closing. I leave that page open among my other tabs.
<!DOCTYPE html>
<html>
<body>
<p>This page is to prevent accidental closing of Chrome.</p>
<script language="JavaScript">
window.onbeforeunload = function () {
return "Are you sure?";
};
</script>
</body>
</html>
Recently I updated my Chrome browser from version 56 to 60. Now the code doesn't seem to work as it no longer asks for confirmation before closing. I tried many different variations from the internet but none seem to work.
Note: I am very new to web development.