When creating a web app manifest for Chrome, you can specify your display as fullscreen, standalone, minimal-ui or browser
What are the differences between fullscreen and standalone and when should I use which? They seem very similar to me.
When you use standalone it looks like a native app. When you use fullscreen there is no system status bar - the app covers whole screen.
What you want most often is standalone. Choose fullscreen if you have a specific use-case, such as gaming.