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

https://www.fastbookmarks.win/safari-26-on-iphone-and-ipad-helps-websites-feel-more-like-real-apps-when-you

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