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

https://wiki-wire.win/index.php/What_Does_Installability_Mean_for_Web_Apps_on_iOS_26%3F

Safari 26 helps websites feel more like native apps on iPhone and iPad by improving how they work when added to your Home Screen. When you open a site with the new "Open as Web App" option, it runs without browser bars or tabs cluttering the screen