The placeholder selectors in SASS 3.2 are really cool, almost like creating a private keyword for CSS.<p>But I would never use semantic class names, that just seems like a huge waste of time. If I'm building a page, I shouldn't have to touch a SASS file unless I'm actually creating new styles.<p>Technically speaking, a class name should never be something like "download-whitepaper" - IDs are used to uniquely identify things, not classes.