Safari 26 on iPhone and iPad improves how websites work when saved to your Home...

https://www.bookmarking-fox.win/safari-26-helps-websites-behave-more-like-apps-on-your-iphone-and-ipad-when

Safari 26 on iPhone and iPad improves how websites work when saved to your Home Screen. With the new ‘Open as Web App’ option, sites launch full-screen without browser bars, making them feel more like standalone apps