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Reported by Anton Prowse 9.4.1 says: # In a block formatting context, each box's left outer edge touches # the left edge of the containing block (for right-to-left # formatting, right edges touch). s/box's/in-flow box's/ since floats participate in a block formatting context and yet they don't always touch the edges of their containing block. [Whether abspos elements participate is less clear.] See: http://lists.w3.org/Archives/Public/www-style/2011Jan/0087.html (Issue 7)