1. @DomName('SVGTextContentElement.selectSubString')
  2. @DocsEditable()
void selectSubString(int charnum, int nchars)

Source 

@DomName('SVGTextContentElement.selectSubString')
@DocsEditable()
void selectSubString(int charnum, int nchars) =>
    _blink.BlinkSVGTextContentElement.instance
        .selectSubString_Callback_2_(this, charnum, nchars);