In simple terms it's a web application (HTML, CSS, and JS) but does not run in the browser, Instead, it runs in a host application ( Super application )
Mini apps are small web applications commonly (2-4 MB) well this what is mentioned in web.dev but he forgot something to note is that a good mini app is ( 25 - 50 KB ) and in this repository, we will discuss how to reach this level of optimization with images, JS, CSS, and font optimizations.