ladybird/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.idl

interface CSSStyleSheet : StyleSheet {
    // readonly attribute CSSRule? ownerRule;
    // [SameObject] readonly attribute CSSRuleList cssRules;
    // unsigned long insertRule(CSSOMString rule, optional unsigned long index = 0);
    // undefined deleteRule(unsigned long index);
};