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The perspective-origin syntax in the spec is old.
*** Bug 15680 has been marked as a duplicate of this bug. ***
Fixed: http://dvcs.w3.org/hg/csswg/rev/8dde67db27a8 Interestingly, Chrome seems to parse perspective-origin as an unlimited-length list, of which all but the first two values are ignored. Other browsers (Firefox/IE) match the new spec wording, and in particular don't support CSS3 background-position syntax.