Interesting. I did something like this a few years back, sample output:<p><a href="http://uguu-archive.appspot.com/misaka/replay.html" rel="nofollow">http://uguu-archive.appspot.com/misaka/replay.html</a><p><a href="http://ioccc.org/2013/misaka/spoiler.html" rel="nofollow">http://ioccc.org/2013/misaka/spoiler.html</a> (mirror, in case if I ran out of quota)<p>I would be curious in some implementation details for this project, particularly how the intermediate deltas are stored.