Thanks, but this is a server-side thing and has nothing to do with client-side DOM manipulation?! Sure, you can put stuff on the server and do HTTP over the wire. It's oftentimes the better solution. But there are apps/tools that are rightfully an SPA (like tldraw or excalidraw for example) and can run local-first and offline in a browser. You build the entire app in JS and you'd need a bit more than vanilla Web components for that if you want to avoid client-side state explosion.

Look at the file path I specified. That file runs only in the browser.