Wanting to serve different size images to different size screens is nothing new but at last the web has a practical solution for responsive images and art direction. Thanks to a lot of hard work by a lot of people, the Responsive Images Community Group has achieved the goal of seeing its API becoming a valuable building block of the web.
The <picture> element and its related srcset and other attributes are already being incorporated in Blink, Gecko and WebKit, have been included in the HTML5 validator and are part of the WHATWG HTML5 spec. A triumph of common sense and cooperation — hurrah!
To celebrate this, I was lucky enough to interview Dr. Stanley Dards, the wise old man of the web, to get his unique insight on the topic.
And here’s a good practical summary of responsive images and how you can use them today.
Daniemon's Blog 