@David Hund: we just used git for version control. The style guide changed continually and the markup as well, but we didn’t actually name different versions of an HTML document.
@Dave Olsen: Thanks for the question. So for Editorially we just had the one guide and it was the one that changed as we changed the app. We iterated very quickly on the application since it was a start up in beta, so code went out daily to production. With that type of quick iteration, we just let the style guide be in sync as much as possible with the application. Does that make sense? Also, I created the guide after the application was already live, so it was built from the live CSS. Up until this article was published, our guide was not a public document, so it really was just for the team to keep tabs on what was in the application and use as a reference.