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http://lists.w3.org/Archives/Public/www-style/2010Oct/0550.html
It seems we're generally agreed that lists longer than transition-property should be truncated. Can the spec be updated to reflect this? In my testing, IE/Firefox/Opera all behave this way, and only WebKit repeats to match the length of the longest list.
http://dvcs.w3.org/hg/csswg/rev/48e571e1ced0