1. DomName('Range.setStartBefore')
  2. DocsEditable()
void setStartBefore(Node refNode)

Source 

@DomName('Range.setStartBefore')
@DocsEditable()
void setStartBefore(Node refNode) => _blink.BlinkRange.instance.setStartBefore_Callback_1_(unwrap_jso(this), unwrap_jso(refNode));