int addRule(
String selector,
String style,
[int index]
)

Not documented.

Source

int addRule(String selector, String style, [int index]) {
  if (index != null) {
    return _blink.BlinkCSSStyleSheet.instance.addRule_Callback_3_(unwrap_jso(this), selector, style, index);
  }
  return _blink.BlinkCSSStyleSheet.instance.addRule_Callback_2_(unwrap_jso(this), selector, style);
}