Yes! A comment box is a component. The tree view you look at comments in are components. Usernames and scores are component. A shared „link“ on the frontpage is

Yes! A comment box is a component. The tree view you look at comments in are components. Usernames and scores are component. A shared „link“ on the frontpage is a component. HN is not rendered on the client side, but its backend uses these „components“ via a templating framework. Components are just templates for the frontend.