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

https://www.phone-bookmarks.win/safari-26-on-iphone-and-ipad-helps-websites-feel-more-like-apps-by-improving

Safari 26 brings a smoother, more app-like feel to websites on iPhone and iPad. When you add a site to your Home Screen, it now launches more like a native app without the usual browser bars cluttering the screen