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How does StackOverflow do its question revision history?

Someone corrected my post. I found the representation of both versions helpful.

What is the name of the concept? What does Stack Overflow use for it?

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migrated from stackoverflow.com Mar 19 '11 at 3:25

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marked as duplicate by ChrisF, Martijn Pieters, Pops, jonsca, Brad Mace Sep 25 '12 at 14:25

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up vote 2 down vote accepted

According to Jeff's 2009 blog post, he uses this algorithm and this implementation.

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