CSSStyleSheet

long addRule(
    in DOMString selector, 
    in DOMString style, 
    in unsigned long index) raises(DOMException); 

void deleteRule(
    in unsigned long index) raises(DOMException); 

unsigned long insertRule(
    in DOMString rule, 
    in unsigned long index) raises(DOMException); 

void removeRule(
    in unsigned long index) raises(DOMException); 

readonly attribute CSSRuleList cssRules; 

readonly attribute CSSRule ownerRule; 

readonly attribute CSSRuleList rules;