1. DomName('SVGTextContentElement.selectSubString')
  2. DocsEditable()
void selectSubString(int offset, int length)

Source 

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