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Version: Nov. 2011 Editor Draft. From: http://lists.w3.org/Archives/Public/www-style/2011Nov/0714.html Error accumulation vs. performance in cases where there is a cyclic dependency between the position/size of the exclusion and the surrounding content it affects. (For example, when the exclusion is centered or otherwise referencing the bottom edge, actually getting the position right would require multiple-pass layout. The current spec limits it to two passes, which will give wrong results in many cases.)
From Rossen: There is really nothing to talk about here. IOW, if anyone comes up with a better proposal that fixes the problem we
The issue was discussed and resolved as closed during 11/2012 TPAC in Lyon, France. http://logs.csswg.org/irc.w3.org/css/?date=2012-10-28