Safari 26 helps many websites feel more like real apps on your iPhone and iPad....

https://www.bookmark-maker.win/safari-26-makes-websites-on-your-iphone-and-ipad-feel-more-like-native-apps

Safari 26 helps many websites feel more like real apps on your iPhone and iPad. When you add a site to your Home Screen, it can open in a special full-screen mode without the usual browser bars getting in the way