My Photoshop Classroom

Adaptive images are the current hot topic in conversations about adaptive and responsive Web design. Why? Because no one likes any of the solutions thus far. New elements and attributes are being discussed as a solution for what is, for most of us, a big headache: to provide every user with one image optimized for their display size and resolution, without wasting time, memory or bandwidth with a client-side solution.
We have foreground and background images. We have large and small displays. We have regular and high-resolution displays. We have high-bandwidth and low-bandwidth connections. We have portrait and landscape orientations.
Some people waste bandwidth (and memory) by sending high-resolution images to all devices. Others send regular-resolution images to all devices, with the images looking less crisp on high-resolution displays.
What we really want to do is find the holy grail: the one solution that sends the image with the most appropriate size and resolution based on the browser and device making the request that can also be made accessible.
The “clown car” technique is the closest thing we’ve got to a holy grail: leveraging well-supported media queries, the SVG format and the <object> element to serve responsive images with a single request. The solution isn’t perfect yet, but it’s getting close.


Source: http://coding.smashingmagazine.com/2013/06/02/clown-car-technique-solving-for-adaptive-images-in-responsive-web-design/