Safari 26 brings a smoother app-like feel to many websites on your iPhone and...

https://wiki-square.win/index.php/Safari_26_Web_App_vs_Regular_Bookmark:_What_Is_the_Difference%3F

Safari 26 brings a smoother app-like feel to many websites on your iPhone and iPad. When you add a site to your Home Screen, it can now open without the usual browser bars, giving you more screen space and less distraction