On Feb. 6th, I published a proposal for a simplified <picture>
design, in order to make the element accessible to end-users. After mailing list dicussion, the community was asked for a unified solution that doesn't sacrifice any functionality or performance present in original design.
Without breaking compatibility or usability of the current <picture>
design, I believe the that we can also support a simplified, declarative model that focuses on use case 3.1, and is easier for end-users and content management systems to suppport. I introduced the unified proposal on Feb. 27th 2013 via the public-html-comments mailing list, and also notified respimg.
In lieu of duplicating all content from [my original proposal](https://gist.github.com/n