ProPublica has released a helpful set of guidelines for creating news apps and thinking about how to design them.
From the guide:
This style guide comprises the typographic and technical best practices used by ProPublica’s News Applications desk. Most of the rules here also apply to our online graphics, a category that has a lot in common with news applications. It’s not meant to be a design spec or a coding style guide, though you should probably have both of those.
Check out the ProPublica News Apps Style Guide on GitHub.
