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Badging for Home Screen Web Apps
Along with the many other features for web apps on iOS and iPadOS 16.4, WebKit now includes support for the W3C’s Badging API.
https://webkit.org/blog/14112/badging-for-home-screen-web-apps

Badging API - Web APIs | MDN
The Badging API gives web developers a method of setting a badge on a document or application, to act as a notification that state has changed without displaying a more distracting notification. A common use case for this would be an application with a messaging feature displaying a badge on the app icon to show that new messages have arrived.
https://developer.mozilla.org/en-US/docs/Web/API/Badging_API


Seonglae Cho