Safari 26 on iPhone and iPad makes websites feel more like apps by improving...

https://bizzmarkblog.com/why-does-my-ipad-web-app-feel-different-from-the-same-site-in-safari-tabs/

Safari 26 on iPhone and iPad makes websites feel more like apps by improving how they behave when saved to the Home Screen. When you add a site, it can open in its own window without the usual browser bars, giving you a cleaner, app-like experience