Very good. I was wondering why nobody did something like that before. At least this was my conclusion from my google searches few months ago. From a design perspective, I don't like storing state in the DOM itself, I would have find much more flexible to have the state in a json as a single source of truth and use reactive patterns such as state change => ui change and not hiting the DOM directly. That sounds like big framework things, but it saved me from acute headaches in a personal similar framework I did for self-contained apps. It was not HTML but I thought I would apply the same logic if I had to do it for html apps too.