A reference to the window that opened this one.
Window thisWindow = window; WindowBase otherWindow = thisWindow.open('http://www.example.com/', 'foo'); print(otherWindow.opener == thisWindow); // 'true'
Source
@DomName('Window.opener') @DocsEditable() WindowBase get opener => _convertNativeToDart_Window(this._get_opener);
Source
set opener(Window value) { JS("void", "#.opener = #", this, value); }