For a mobile app, the apple-mobile-web-app-capable meta tag determines whether the application runs in web mode, with an address bar and navigation bar, or in full screen mode without them.

<meta name="apple-mobile-web-app-capable" content="yes"/>

With content="yes", the application will run in full screen mode, without the address bar at the top and the navigation bar at the bottom. The JavaScript boolean variable window.navigator.standalone will be set to true.

<meta name="apple-mobile-web-app-capable" content="no"/> (default)

With content="no", the application will run in web mode, with an address bar at the top and a navigation area at the bottom. The JavaScript boolean variable window.navigator.standalone will be set to false.