I'm the guy who made this presentation. I see a lot of complaints about the two-dimensional layout of slides, so let me say that this was made for a talk, and I

I'm the guy who made this presentation. I see a lot of complaints about the two-dimensional layout of slides, so let me say that this was made for a talk, and I put it online so that my audience could play with it when I gave my talk. Also, during my talk, I did lots of real-time demos on that empty playground page and highlighted a bunch of technical details that are not on the slides. Therefore I agree with those who find it confusing that this is definitely not the best reading material for learning d3, but like @bengillies said, it served my purpose as the presenter. If you are interested in learning d3, there are a bunch of tutorials on the GitHub wiki: https://github.com/mbostock/d3/wiki/Tutorials https://github.com/mbostock/d3/wiki/Tutorials, and I like this one in particular: http://mbostock.github.com/d3/tutorial/circle.html http://mbostock.github.com/d3/tutorial/circle.html. Not comprehensive, but very clear on what it covers. Let me also recommend this talk for d3 starters: http://vimeo.com/35005701 http://vimeo.com/35005701. It starts with very basic stuffs (JSON), and has lots of live demos. I kinda learned from it when making this presentation.