1. @DomName('CSSGroupingRule.insertRule')
  2. @DocsEditable()
  3. @Experimental()
int insertRule(String rule, int index)

Source

@DomName('CSSGroupingRule.insertRule')
@DocsEditable()
@Experimental() // untriaged
int insertRule(String rule, int index) => _blink.BlinkCSSGroupingRule.instance
    .insertRule_Callback_2_(this, rule, index);