Introducing...

Response JS is a lightweight, jQuery plugin, that gives designers/devs tools for producing performance-optimized, mobile-first responsive websites. It provides easy-to-use action hooks for dynamically swapping code blocks based on screen sizes and semantic methods for progressively serving images/media via HTML5 data attributes. Response's methods are also available as object properties, making them useful tools in OOP-minded custom development.

Full documentation is in the works. (~November) There are a few examples in the source and here.

Latest version: 0.2.7 | min | Github

DEMO: markup @ default // view the JavaScript source to see how this works

Developer: | Twitter | GitHub