You can always uses a MITM proxy that presents an unencrypted view of the web. As long as you keep to HTML+CSS, that should be enough. Some simple js also, but

You can always uses a MITM proxy that presents an unencrypted view of the web. As long as you keep to HTML+CSS, that should be enough. Some simple js also, but you can't generate https URLs on the client side. Which, for retrocomputing, is probably fine. You wouldn't want to expose these "retro" machines to the Internet anyways.