onUnLoad not working, pls help as I have tried running on different browser but not happen.

Question

JSC

Answer 1

I think you want document.onload not document.onunload
use it
if that does not work then write
document.addEventListener("load",function());
or attach only to element

Answer 2

it is .onunload all lower case

Answer 3

Thanks a lot but not still working, just display the body but no effect of JS when refreshed or closing

Answer 4

it's working with a capital letter
onUnLoad="instruction"