One things that is missing from html is a "jar" like format so that an entire document can be contained in a single file (without data: hacks). It seems that a

One things that is missing from html is a "jar" like format so that an entire document can be contained in a single file (without data: hacks). It seems that all we need is an extension, I propose ".htz" and a mime type, say "application/x-html-bundle". Browser's would just download it and open the containing "index.html" (at the top level or inside a unique top level directory) and open other assets relative to that.