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()"> <a href="https://wikimass.com/js">Learn Javascript</a> <script> function myFunction(){ // Default value, you cannot change. return "Changes you made may not be saved."; } </script> </body> </html>

Attribute Value

ValueExplanation
scriptScript runs when the document is about to be unloaded.

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