Maintainable CSS

This guide seems outdated, and written with IE's limitations in mind. Almost no one is using IE anymore.

> We could use a chained selector for state e.g. .module.isDisabled. The problem is that this approach has less browser support.

> Whichever approach you take, be aware of the 31 CSS file limit found in versions of Internet Explorer. Internet Explorer 9, for example, ignores styles stored in the 32nd (or 33rd etc) file.