Thanks @TiddlyTweeter. Yes, it seems the original hosting service, rawgit, has been deprecated. That’s you’re only seeing the raw html code. I should move it to github pages. Like I said, I need to update it.
This plugin helped to guide new users into using TiddlyWiki when Maarfapad was still a thing. Although it did help onboard new users, I’ve learned since then that the feature rich UI of TiddlyWiki requires a more fine-grained introductory approach as far as app tutorials are concerned.
It also helps to highlight the problem of product onboarding: it’s a big problem we as app developers face. There are many solutions out there to solve this problem.