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

https://www.kilobookmarks.win/with-safari-26-on-iphone-and-ipad-many-websites-now-feel-much-more-like-apps

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 in a clean, distraction-free window without browser bars