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Reported by fantasai The border edge of a collapsed-borders table cell is not defined. Conversation begins: Bug description: http://lists.w3.org/Archives/Public/www-style/2012Mar/0590.html
Simon Sapin suggests defining it to be the padding edge + half of the collapsed border of each side. Proposal: http://lists.w3.org/Archives/Public/www-style/2012Mar/0670.html