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http://lists.w3.org/Archives/Public/www-style/2011Apr/0344.html
*** Bug 17738 has been marked as a duplicate of this bug. ***
Also http://lists.w3.org/Archives/Public/www-style/2013Jan/0113.html
Most recently http://lists.w3.org/Archives/Public/www-style/2013Aug/0271.html
And more http://lists.w3.org/Archives/Public/www-style/2014May/0387.html
dbaron addressed this: "Note that order is also important within each animation definition for distinguishing <single-animation-name> values from other keywords. When parsing, keywords that are valid for properties other than animation-name whose values were not found earlier in the shorthand must be accepted for those properties rather than for animation-name."