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9.5 (Floats) says: # 5. The outer top of a floating box may not be higher than the outer # top of any block or floated box generated by an element earlier # in the source document. s/block or floated/floated or in-flow block/ since we need to exclude abspos boxes. (It could be argued that abspos boxes are not block-level, which would remove the need to make the above change, but that would require us to make that statement explicit somewhere.) Bug description: http://lists.w3.org/Archives/Public/www-style/2011Mar/0650.html (final sentence of post)