WindowBase opener

Source 

@DomName('Window.opener')
@DocsEditable()
WindowBase get opener => _convertNativeToDart_Window(_blink.BlinkWindow.instance.opener_Getter_(this));
void opener=(Window value)

Source 

@DomName('Window.opener')
@DocsEditable()
set opener(Window value) => _blink.BlinkWindow.instance.opener_Setter_(this, value);