Retina Display Media Query | CSS-Tricks
For including high-res graphics, but only for screens that can make use of them. "Retina" being "2x": @media (-webkit-min-device-pixel-ratio: 2), (min-reso
CSS
Media Queries for iPad, iPad Mini, iPhone
Target an iPad, iPad Mini, iPhone, and other devices specifically with easy to use CSS media queries...
Loading CSS Into WordPress the Right Way - Tuts+ Code Tutorial
Without CSS, you have very limited choices to style your web pages. And without proper CSS inclusion inside WordPress, you can make it extremely hard for your theme's users to customize the theme's...
Understanding CSS z-index
The z-index attribute lets you adjust the order of the layering of objects when rendering content.
3 Things (Almost) No One Knows About CSS
Former SitePoint team member Kevin Yank is back to explain three CSS tidbits that most people get wr...