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Didn't Google Docs used to have this "playback" feature built in? I clearly remember there being a slider at the top of the page that you could scrub back and forth through a document's revision history.

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I think you've got it confused with some implementations of EtherPad. At least I know I've seen it there, but I don't recall seeing it in Google Docs.

No, I've never used EtherPad before. It's probably Google Wave I'm thinking of.

I remember that from Google Wave at least.

That's probably what I'm thinking of. I could've sworn this was in Google Docs as well, though.

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