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Like it, but for stuff like this there is should be always some kind of live demo. A lot of devs underestimate the power of 'quick presentation'

He did have some live demos at the bottom of the page. He probably should've put them near the top, but that's being nitpicky: http://htmlpreview.github.io/?https://github.com/dannyko/viz...

Also the repo has other examples to play with.

This example doesn't appear to work at all in firefox 47