Safari 26 brings a smoother, app-like feel to many websites on iPhone and iPad....

https://www.pawn-bookmarks.win/safari-26-changes-how-websites-work-on-iphone-and-ipad-by-making-many-of-them

Safari 26 brings a smoother, app-like feel to many websites on iPhone and iPad. When you add a site to your Home Screen, it now opens without the browser’s usual bars and controls—just like a real app