It's fairly common to see someone referring to an edit or deleted comment, but without the original item they're referring to, there's no context.
Is there a way to view the edit history of a question and/or answer? Or see a deleted comment? I would assume either feature would require a certain amount of rep, so if these features exist, how much is needed?
Also, if this feature doesn't exist, is it something we can add, like a History tab?