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I am wondering how Stack Overflow keeps track of edits. Does anyone know how it is done? I am talking about the characters added, etc.

I think Stack Overflow uses this Javascript diff algorithm:

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migrated from Oct 15 '11 at 19:50

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That plugin does not track diffs. That plugin displays diffs. This is a bit different from tracking diffs. – BalusC Oct 15 '11 at 21:44
@Chichiray but couldn't it just then be the script used to compare files differentiated by some kind of naming scheme. Would think a git/svn implementation would be too much, don't you? – tim peterson Mar 6 '13 at 3:01

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