Like Native Apps, The PWA Badge API allows installed web apps to set an application-wide badge on the app icon.

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The App Badge API allows installed web apps to set an application-wide badge, shown in an operating-system-specific place associated with the application (such as the shelf or home screen). Badges tend to be more user-friendly than notifications and can be updated with a much higher frequency since they don't interrupt the user. And, because they don't interrupt the user, they don't need the user's permission. Keep in mind that to display the Badge count, Your PWA application should be installed on your device. Possible use cases Examples of sites that may use this Library include: Chat, email, and social apps, to signal that new messages have arrived, or to show the number of unread items. Productivity apps, signal that a long-running background task (such as rendering an image or video) has been completed. Games, to signal that a player action is required (e.g., in Chess, when it is the player's turn).