Safari 26 changes how websites work on iPhone and iPad by letting you open...

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

Safari 26 changes how websites work on iPhone and iPad by letting you open sites with an 'Open as Web App' option. When you add these sites to your Home Screen, they launch full screen without browser bars, making them feel more like real apps