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http://dev.w3.org/csswg/cssom/#dom-cssstyledeclaration-camel-cased-attribute [[ camel-cased attribute ]] WebKit/Blink support both style.webkitFoo and style.WebkitFoo. In http://webdevdata.org/ data set 2013-09-01 (doesn't include external scripts) I find 63 occurrences of "style\.webkit[A-Z]" and 86 occurrences of "style\.Webkit[A-Z]". Consider specifying this if the property starts with "-webkit-".