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http://lists.w3.org/Archives/Public/www-style/2010Oct/0542.html
CSS meeting at TPAC 2011 Resolution: - 'none' is not allowed in a list. - 'all' is allowed, but will be used in place of everything in the list before it. For example: transition-property: width, all, height; transition-duration: 1s, 2s, 3s; Ends up as every property including width -> 2s height -> 3s
Said resolution is documented in http://lists.w3.org/Archives/Public/www-style/2011Nov/0709.html
Fixed in: http://lists.w3.org/Archives/Public/public-css-commits/2012Feb/0141.html per that resolution.