…d. It's now too difficult to make the selection a separate mixin because it's buried in the base styles mixin. Adding in a chromeframe file that is never called with a warning in case people were including that file directly. Chromeframe has moved to the _main.scss file to more closely match the updated layout of Boilerplate version 4.0.
…tuff since that's the one thing that boilerplate does that is super annoying.