I just thought I'd mention it more obviously, in case it was missed in the other recent thread about the Cyreal page reporting 50x problems, but at least as a backup I've uploaded the latest source files that were previously impallari.com/testing
to my personal website. I plan on keeping my site running for a while, so feel free to use this and do let me know if my site ever gives you errors. I'm happy if it can be useful to anyone! I know I will at least use it.https://www.musictypefoundry.com/text-font-testing/
If you are wondering why I added "text-" to the name, it should be kind of obvious since my type design targets the music notation market. So, I just wanted to be clear that this page is for testing TEXT fonts and not MUSIC fonts. The technology isn't quite there for live testing on the web, but maybe someday.