Responsive Web Design or RWD, has come a long way since it was first introduced in 2010, and you would think that by now, given the popularity of the subject, all things have been sorted out and all questions have been answered. Not quite.  RWD is a moving target that continues to evolve, but for the most part the majority of the techniques used to accomplish the goal of an adaptable website are unquestionable except one, images.