HTML onbeforeunload Event Attribute
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HTML onbeforeunload Event Attribute
The onbeforeunload event attribute triggers when the document is about to be unloaded.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body onbeforeunload="return myFunction()">
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<script>
function myFunction(){
// Default value, you cannot change.
return "Changes you made may not be saved.";
}
</script>
</body>
</html>
Attribute Value
| Value | Explanation |
|---|---|
| script | Script runs when the document is about to be unloaded. |
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