Stop users from navigating away from a "page" when new document or edit is unsaved

I am looking to configure or add a mechanism to prevent users from navigating away from an edit (or new document) before they click the save button. At a minimum I would like to pop-up a warning to inform the user that they have unsaved content and are they sure they want to lose it.

I would like to do this without having to modify core elements (to maintain ease of future updates) so I am looking for some guidance as to the best approach to achieve this result.

Thanks, Bruce.

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I would start with something akin to (probably simplified at first).

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