Today’s web consumer is a cross-device browser and buyer. One of the more widely adopted solutions to the cross-device (some say mobile) site challenge is Responsive Web Design (RWD), an approach that aims to provide an optimal viewing experience across a wide range of devices. RWD is mostly about client-side solutions to adapt page layouts using fluid, proportion-based grids and flexible images. But there are issues stemming from using desktop technologies for mobile use cases, and a lack of standards and tools that an emerging approach entails. RWD is not simply about layout and design, but also behavior, and whether your site behaves well or poorly depends as much on the content the visitor sees as much as what isn't. This talk will cover the cross-device challenge, how RWD helps and where it presents problems, and some examples of ways to work around these challenges.