Onbeforeunload event support on iPad [duplicate]

This question already has answers here: window.onbeforeunload not working on the iPad? (8 answers) 开发者_如何学JAVA Closed 8 years ago.

Is onbeforeunload event supported on iPad Safari ? If no, is there any alternate way to detect window closing on iPad ? Please help.

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This has been discussed previously here, and there are is some anecdotal evidence to say that it does work in some circumstances.