Tim Kadlec shares his experiences developing a recent client website using a CMS and including support for responsive images. The beauty of this approach comes in providing content editors the ability to include responsive images inline without the need to think about which size version goes where or how the new syntax works.
It’s something which I think is lacking in most CMS (currently) although if you check out the plugin section there is a WordPress plugin that is doing great things.
At long last, it appears we have our much-needed markup solution for responsive images thanks to srcset, sizes and picture. Implementation is already happening in Chrome & Opera (Blink) and Firefox (Gecko). Soon, the Blink implementation will be ported to WebKit. This is fantastic news—we’ve needed this for so long!An excerpt from Don't Wait on Responsive Images