After years of developing CSS layouts and reading web design blogs and CSS books, I still can't believe I come across things that I don't know about super-common CSS properties. Maybe it's just me; maybe I'm just a creature of habit and fail to look closely at things I'm really used to seeing, and I forget that there's more to CSS than what I've personally discovered and learned so far.Well, while reading Christian Heilmann's chapter in the Smashing Book 2, I noticed he used the following code snippet when showing some CSS (edited for brevity):

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