You really might want to look into what the DOM is and how it works.

When HTML reaches the browser, all the markup is parsed, and the browser creates a Document Object Model (https://developer.mozilla.org/en-US/docs/Web/API/Document_Ob...). That object model is an extremely robust API that's loaded with tons of functionality, not the least of which is working with events (https://developer.mozilla.org/en-US/docs/Web/API/Document_Ob...).

The browser itself brings so much functionality that you can do stuff like check the status of the battery; create, save, and access files; get someone's precise lattitude and longitude; and _create and subscribe to streams_.

I'm not sure what you mean by, "html does not allow for event handling," ... but if HTML exists in a browser at all, there's plenty of event handling to go around.

Modern frontend frameworks wouldn't exist without JS events, not the other way around. You can absolutely do this with vanilla HTML+JS.

https://developer.mozilla.org/en-US/docs/Web/API/Event