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http://dev.w3.org/csswg/cssom/#dom-cssstyledeclaration-setproperty [[ setProperty ]] Be clear about what happens to the order of the declarations when setting a new property or overwriting an old one. e.g. <div style="background-color:lime; color:black"> div.style.background = "papayawhip"; div.style.cssText == ?
This seems to be fixed.