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The removeProperty function of the CSSStyleDeclaration interface is defined to return a DOMString, but what that string is supposed to be is not described. As resolved during the 2012-07-18 telecon, it should return the same things as getPropertyValue. link to the telecon's minutes: http://lists.w3.org/Archives/Public/www-style/2012Jul/0442.html
*** This bug has been marked as a duplicate of bug 16345 ***