The Responsive Images Community Group has been proposed:
Our goal is a markup-based means of delivering alternate image sources based on device capabilities, to prevent wasted bandwidth and optimize display for both screen and print.
You are invited to support the creation of this group. Once the group has a total of five supporters, W3C launch the group and people can join to begin work.
In order to join the group, you will need a W3C account.
If you believe that there is an issue with this group that requires the attention of the W3C staff, please send us email on email@example.com
W3C Community Development Team