Attempting to load font files (and probably other resources) from static.miraheze.org fails with a message logged to browser consoles.
This apparently is broken in IE, Edge, Firefox, and Chrome, although Paladox said Safari worked.
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://static.miraheze.org/concordancewiki/f/fd/ConcordanceExtended.otf. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).[Learn More]
The "Learn More" links here.
Note that apparently CORS != CSP, and I have no idea what this is.