Chrestomathy

CAT opens like an app, with its own icon on your home screen.

In Safari:

1. Tap the Share button (⬆︎ in a square).
2. Choose Add to Home Screen.

On iPhone/iPad this works from Safari only.

Open your browser menu (⋮ or …) and choose Install app or Add to Home screen.

On a computer, Chrome and Edge show an install icon at the right end of the address bar.