Native CSS Variables Closer To Reality
by Chris Coyier
Tab Atkins Jr:
...the time until this starts showing up in nightly builds of Webkit is measurable in months.
...this is one of those things that you'll have to wait a decade for before you can reliably use in the public web.
Nettuts+ also has a good overview and lively discussion.
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*May or may not contain any actual "CSS" or "Tricks".