Following along from my recent post about responsive images using pure HTML, this post is about the more server-centric option. It doesn’t answer the art direction question, but it can help reduce the amount of HTML required to implement fully responsive images.
If you are aware of responsive images and the <picture> element, you’ll know that the code required to give the browser enough choices and information in order to have it request the correct image can be somewhat verbose.
This article will cover the other side of the story, allowing the server to help with the decision of which image to show and ultimately greatly reducing the HTML required to achieve responsive images