Setup

Start with a block

http://bl.ocks.org/syntagmatic/b6821801c222d4d3bfe0

You can fork a gist from GitHub

https://gist.github.com/syntagmatic/b6821801c222d4d3bfe0

You can clone a gist that's yours

git clone git@github.com:b6821801c222d4d3bfe0.git

or someone else's

git clone git@github.com:b6821801c222d4d3bfe0.git

Tributary is an environment for prototyping d3.

You can use things like d3.json on urls that have CORS support:
http://tributary.io/inlet/6f29a93e077f284b736d

You can also copy-paste data into a "file" in tributary:
http://tributary.io/inlet/9960b7384b42d22edd3f