Hi John,
Yuwen Wang

I recommend viewing source on the New York Times visualization. The D3 code is not minified and relatively simple to understand. The key file is index.js (scroll past the data to see the key code): https://static01.nyt.com/newsgraphics/2012/09/04/convention-speeches/ac823b240e99920e91945dbec49f35b268c09c38/index.js

Email me if you need help: john@johncoogan.com

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