Responsively deigned websites typically use the picture element to provide a set of images the browser can choose from based on variables such as screen size and orientation. But these "fallback" images are usually all downloaded, even though only one is actually used. It's possible to code sites in ways that avoid that problem, although the fixes are too verbose for regular usage, writes David Newton. A long-term solution that changes how these elements are handled in necessary, he writes.

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