Safari 26 brings a fresh feel to many websites on your iPhone and iPad by...

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

Safari 26 brings a fresh feel to many websites on your iPhone and iPad by making them act more like apps. When you save a site to your Home Screen, it opens without the usual browser bars, giving you a cleaner view