source">
      <h2>Source</h2>
      <pre><code class="prettyprint lang-dart">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);
}</code></pre>
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