Safari 26 on iPhone and iPad helps many websites feel more like apps by...

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

Safari 26 on iPhone and iPad helps many websites feel more like apps by improving the Home Screen experience. When you add a site to your Home Screen, you can choose 'Open as Web App' so it launches without the usual browser bars and menus