Eric Meyer: CSS Beyond the Browser: Going to Print. Learn what this does and why it’s useful:
#content a[href^="/"]:after { content: ” (http://www.alistapart.com” attr(href) “) “; }
Eric Meyer is the author of several CSS books and the maintainer of CSS/edge, where I learned several tricks that I use in my advanced stylesheets. While current browsers are catching up to support CSS-1 and CSS-2, he is one of the people working on CSS-3, of which that code listed above is an example. Wild.
