The older HTML equivalent would be to package it in a *.mhtml where the various parts are mime-encoded, like a multipart email would. It's only been around for

The older HTML equivalent would be to package it in a *.mhtml where the various parts are mime-encoded, like a multipart email would. It's only been around for decades. Creating it was saving a webpage in IE. Mozilla/Firefox never supported it, though, even though they already had the necessary code for doing email… possibly because they had inherited the Netscape mail codebase which was a bit difficult to reuse.