Safari 26 helps websites feel more like apps when you use them on iPhone and...

https://wiki-book.win/index.php/How_Do_Service_Workers_Help_if_Safari_Already_Opens_Sites_as_Web_Apps%3F

Safari 26 helps websites feel more like apps when you use them on iPhone and iPad. When you add a site to your Home Screen, it can now open in a cleaner, app-like view without the usual browser bars