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endumiuz / endumiuz.github.io Public

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confirm_close.html

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endumiuz.github.io

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confirm_close.html

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23 lines (16 loc) · 323 Bytes

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<!DOCTYPE html>

<html lang=en>

<head>

<title>Close this tab</title>

</head>

<body>

<button type="button">1. Click this button</button>

<p>2. Close this tab and watch the warning box come up!</p>

<p>3. Click "Stay on page"</p>

<script>

window.onbeforeunload = function() {

return "foo";

};

</script>

</body>

</html>

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