These files contain a Compass-based CSS3/HTML5 scaffolding. The markup and styling contained within may be used as a bootstrap for a variety of web projects, ranging from simple, static websites to full-fledged web applications built with frameworks like Django, Wicket and Rails.
Clean, readable, semantic markup is the basis of any good web project, be it simple or complex. In addition to providing a rock-solid, cross-browser-compatible basis for your project, you should be able to open the source code for any page in this scaffolding and comprehend it as easily as you do the final HTML rendering.
The past few years have seen an explosion of new ways by which people access and interact with the web. This scaffolding uses the principles of responsive web design to provide a fast, friendly user experience to a variety of devices, from phones to tablets to desktop computers. To see it in action on this page, try resizing your browser window.
The pace of innovation on the web is staggering, with new tools and methodologies changing the landscape so frequently it's hard to keep track. This scaffolding strives to incorporate the latest innovations and best-practices for markup, styling and behavior, like those suggested in 320 and up.