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We continue on A List Apart’s four-part “From URL to Interactive” series with Greg Whitworth, a member of the W3C CSS Working Group and the CSS Houdini Task Force. He'll walk through how CSS is parsed, how values are computed, and what the "cascade" in style sheets actually means. Then we'll discuss layout, painting, and composition. Brace yourselves, we're about to drive through a one of our most scenic and winding parts of our journey.