The Cascade
Briefly

But now that nesting has pretty good support then it's just a whole lot nicer to organize them more like this:...
Then there's of course other pretty popular things that media queries can do, such as enable styles based on the orientation of the device...
Also, as I mentioned yesterday, you can detect JavaScript support with a media query now:...
Another real shocker found deep in the spec is that it's possible to use a media query to style an element based on whether it's overflowing the parent, like this:...
Read at Csscade
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