You are correct. You don't have to use the shadow DOM, when you create a new Custom Element. The shadow DOM provides two things: - style encapsulation (as wel

You are correct. You don't have to use the shadow DOM, when you create a new Custom Element. The shadow DOM provides two things: - style encapsulation (as well as `id` attributes) - ability to use `<slot>` for templating You should use it if you require one of the above or both.