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Mailing list comment from Rob: http://lists.w3.org/Archives/Public/www-style/2012Feb/0069.html
Comment from David Hyatt on the mailing list: http://lists.w3.org/Archives/Public/www-style/2012Feb/0070.html
Additional mailing list links: Vincent proposes we should not create stacking contexts by default: http://lists.w3.org/Archives/Public/www-style/2012Jan/1317.html Anton says no default stacking context, to be consistent with the rest of CSS: http://lists.w3.org/Archives/Public/www-style/2012Feb/0157.html Alex proposes to keep the default stacking contexts http://lists.w3.org/Archives/Public/www-style/2012Feb/0561.html
CSSWG resolved to keep stacking context language: http://log.csswg.org/irc.w3.org/css/?date=2012-10-29