…roaden browser support. The included update to README.md explains the changes I'm proposing to the markup pattern (there no changes to elements themselves) to support browsers that formerly did not work, like iOS4, IE browsers versions 6-10, Android browsers 1.x and up. As a result, there aren't any known "unsupported" browsers, in that every browser tested so far at least receives a fallback image - for example, IE6-8 will only see picture source elements that do not use media queries, since it doesn't support them natively (media types are ok though). Fixes #5 and Fixes #8.
…r IE 8 and older browsers with fallback content using any source elements that don't rely on media queries (note: media types are fine though). In order for this to work, the script needs to run from HEAD, like any HTML5 shiv would. Script still works in non-IE browsers if it's not in HEAD.
…and generated the child img element if it's not already present. With this tweak in place, the picture markup pattern supports non-js fallbacks, avoids prefetch, and enjoys all benefits of the proposed picture element functionality. Production ready, perhaps.