Nice! Looking at the code, it seems that it's a very old version of OpenSeadragon, back when it was just called Seadragon. It's still looking good, so perhaps t

Nice! Looking at the code, it seems that it's a very old version of OpenSeadragon, back when it was just called Seadragon. It's still looking good, so perhaps they've been adding their own extensions to it. Thanks for pointing to it!