I managed to break that link somehow and can no longer edit it, here's the correct one: https://developer.mozilla.org/en-US/docs/DOM/window.onbeforeunload https

I managed to break that link somehow and can no longer edit it, here's the correct one: https://developer.mozilla.org/en-US/docs/DOM/window.onbeforeunload https://developer.mozilla.org/en-US/docs/DOM/window.onbefore...