This is just the beginning of a writer's guide for the MDC. If you have questions about usage and style that aren't covered there, I recommend referring to the Economist style guide or, failing that, the Chicago Manual of Style.
We will be expanding the guide over time, so if you do have specific questions that aren't covered by the writer's guide, please send them to the MDC mailing list or project lead so we know what should be added.
Page name and heading capitalization
Page names and section headings should use sentence style capitalization (only capitalize the first word and any proper nouns) rather than headline style capitalization: