Safari 26 on iPhone and iPad helps websites act more like apps by improving how...

https://smart-wiki.win/index.php/What_Does_%E2%80%9CBrowser-First%E2%80%9D_Actually_Mean_for_a_Mobile_Service%3F

Safari 26 on iPhone and iPad helps websites act more like apps by improving how they work from the Home Screen. When you add a site to your Home Screen and choose 'Open as Web App,' the site launches without the usual browser bars and tabs