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div { transition: 0.6s ease-in-out left; } "left" token is marked as erroneous while the whole property value is correct. Seems to be an infrastructure (GrammarResolver) flaw.
According to grammar definition http://www.w3.org/TR/css3-transitions/#transition you should separate transition properties with comma. I think your example should be div { transition: 0.6s ease-in-out, left; } You can correct me, if I made mistake.