Safari 26 changes how websites work on iPhone and iPad by making many of them...

https://source-wiki.win/index.php/What_Does_WebKit_Say_Is_New_in_Safari_26%3F

Safari 26 changes how websites work on iPhone and iPad by making many of them feel like apps. When you add a site to your Home Screen, it now opens as a web app—no browser bars or tabs, just the site itself