Clicking this bookmarklet on a browser tab will cause the above alert to display when you try to close it. Handy if you have work you really don't want to lose.
Last active
November 28, 2018 04:41
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Save benknight/13595bdd49a6b87c6d24 to your computer and use it in GitHub Desktop.
Before Unload Bookmarklet
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| javascript:window.addEventListener%28%22beforeunload%22%2C%20function%20%28e%29%20%7B%20var%20confirmationMessage%20%3D%20%22o/%22%3B%20%28e%20%7C%7C%20window.event%29.returnValue%20%3D%20confirmationMessage%3B%20return%20confirmationMessage%3B%20%7D%29%3B |
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How to use this? Where i need to paste the code?