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

https://rapid-wiki.win/index.php/What_Changed_in_Safari_26_for_Add_to_Home_Screen_Websites

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 usual browser chrome, making it look and act more like a native app