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Save it in drafts and notify them when they come back.

So Facebook and Twitter should also save drafts of posts you were going to make? What if latency is non-trivial, or connection is lost? Do I also want to send ajax posts for drafts every second to ensure that as little as possible is lost? A lot of this is mitigated by a very simple

  confirm("Are you sure you want to leave?");

Yeah but for all the times when I really do want to leave, now I have to annoyingly click "Yes" in a dialog I didn't expect in the first place.

I like the localStorage solution for drafts much better.

Twitter actually does save drafts in localStorage.

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