CSSVariablesDeclaration

DOMString getVariableValue(
    in DOMString variableName); 

DOMString item(
    in unsigned long index); 

DOMString removeVariable(
    in DOMString variableName) raises(DOMException); 

void setVariable(
    in DOMString variableName, 
    in DOMString value) raises(DOMException); 

attribute DOMString cssText; 

readonly attribute unsigned long length; 

readonly attribute CSSRule parentRule;