1. DomName('SVGNumberList.replaceItem')
  2. DocsEditable()
Number replaceItem(Number newItem, int index)

Source 

@DomName('SVGNumberList.replaceItem')
@DocsEditable()
Number replaceItem(Number newItem, int index) => _blink.BlinkSVGNumberList.instance.replaceItem_Callback_2_(this, newItem, index);