window.externalThe window.external.AddSearchProvider() and window.external.IsSearchProviderInstalled() do nothing. Historically, they added external search providers to the browser.limitedhttps://html.spec.whatwg.org/multipage/obsolete.html#externalhttps://developer.mozilla.org/docs/Web/API/Externalapi.Externalapi.External.AddSearchProviderapi.External.IsSearchProviderInstalledhttps://nowyoucanuse.com/features--external.html