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

https://wiki-neon.win/index.php/How_Does_Safari_Handle_Payments_Inside_a_Website_Without_an_App%3F

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