Yes you can. See this page for example: https://gildas-lormeau.github.io/ https://gildas-lormeau.github.io/ (check the source code of the page if you're curious

Yes you can. See this page for example: https://gildas-lormeau.github.io/ https://gildas-lormeau.github.io/ (check the source code of the page if you're curious). It was saved with SingleFileZ and is served via a HTTP server. Note that you don't need any extension to view it in modern browsers. On paper, you could even store an entire website in a SingleFileZ file. It just need to be implemented...