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Reported by Arron Eicholz 8.3.1 talks about adjoining margins, how they collapse and what the exceptions to collapsing are, before defining which margins are adjoining. This is slightly confusing because it's not clear in what way the exceptions are exceptional until you know which margins would normally be the ones collapsing. Conversation begins: http://lists.w3.org/Archives/Public/www-style/2012Feb/1153.html Bug description: http://lists.w3.org/Archives/Public/www-style/2012Feb/1349.html (middle section of post)