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re: Sure you want to leave?—browser beforeunload event VIEW POST

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re: Yes, please annoy a user who wants to leave...
 

This feature exists on the web whether I write about it or not! :)

Hopefully this post has given some examples of when beforeunload is appropriate to use, and detailed a technical approach so that folks don't just generate warnings all the time. And you might also save your users' data—if a network request is still pending while a page is being closed, beforeunload can be useful to ensure that it does complete successfully.

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