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Apple broke web apps in iOS 17 beta and hasn't fixed them
(www.theregister.com)
This is a most excellent place for technology news and articles.
No, a web app, otherwise known as a Progressive Web App or PWA, are just shortcuts on your home screen that open a fullscreen instance of Safari to the originally provided URL. The article explicitly talks about apps that don’t follow Apple guidelines, which means they wouldn’t be able to get a TestFlight, nor into the App Store.