Of all the web pages I have from 20+ years ago for things like directories of files or collections of documents, the ones that are broken now are the ones with assets split out. Their folders get clobbered or separated from their index files and everything broke during some data migration to a new hard drive or whatever. The ones with the css or js inline still largely work. Images usually aren't base64 encoded but these don't have many images anyway. I've always thought I should reconsider doing simple, single file applications more for things I want to archive into the distant future.