1. @DomName('Window.open')
  2. @DocsEditable()
WindowBase open(String url, String target, [ String features ])

Source 

@DomName('Window.open')
@DocsEditable()
WindowBase open(String url, String target, [String features]) =>
    _convertNativeToDart_Window(_blink.BlinkWindow.instance
        .open_Callback_3_(this, url, target, features));