1. DomName('Selection.setBaseAndExtent')
  2. DocsEditable()
  3. Experimental()
void setBaseAndExtent(Node baseNode, int baseOffset, Node extentNode, int extentOffset)

Source 

@DomName('Selection.setBaseAndExtent')
@DocsEditable()
@Experimental() // non-standard
void setBaseAndExtent(Node baseNode, int baseOffset, Node extentNode, int extentOffset) => _blink.BlinkSelection.instance.setBaseAndExtent_Callback_4_(this, baseNode, baseOffset, extentNode, extentOffset);