In this article, I’ll dive into some of the most common practices for building responsive site layouts and experiences. I’ll describe the emerging and available techniques for site layouts that flexibly resize based on screen real estate (referred to as “fluid grids”) so as to ensure that users get complete experiences across whatever screen size they are using. Additionally, I’ll show how to present rich media, especially images, and how developers can ensure that visitors on small-screen devices do not incur additional bandwidth costs for high-quality media.