Responsive images have come a long way in the past few years, including browser support for new HTML elements and attributes that we can use right now. As WordPress designers and developers, it’s hard to know how and when to make the best use of the new markup patterns in our themes and plugins. As a member of the Responsive Images Community Group, and a lead developer on the RICG Responsive Images Plugin effort I’ve learned a bunch of the nitty gritty so you don’t have to.