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);