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Originally Posted by WillAdams

Let me know when you can do an ePub w/ the animations and other special features of http://motionmountain.net/

Perhaps these animations are embedded flash objects and now flash support is dropping from browsers engines (aka epub renderer), but there are other better ways for supporting animation here with all that html5 and javascript stuffs but not yet fully supported. so from my angle your question boils down to absence of good epub reader.