I know great CSS authors who swear by this book as exactly what it says, their definitive guide to CSS.
Written by the guru of CSS Eric Meyer who knows the specs inside and out, this book has excellent examples showing the way CSS should work from floats to text styles. While targeted at CSS1, its essential for the theory and foundation without a doubt.
Like most all O'Reilly "definitive" books, it has fantastic rule by rule syntax reference.
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