Safari 26 changes how websites work on iPhone and iPad by making them feel more...

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

Safari 26 changes how websites work on iPhone and iPad by making them feel more like apps. When you add a site to your Home Screen, it now opens without the browser controls, giving you a clean, full-screen experience