When you take the responsive web design route, part of the deal is fluid grids. That is, container elements set in percentage widths. Just one example: an <article> that holds a blog post might be 320px wide on a small screen device and 690px wide on some large screen. Text can be resized and will flow nicely to fill a container. That’s not too hard. But media – images, video players, and audio players – demand a bit more attention (e.g. a video that sticks off the edge of the screen == bad). This post is to round up the methods of handling that.