Hi Neil, sorry for the late response. I think the "font fallback" is a general concept in web development. For example, I can set multiple font types to an application, like font type A and font type B, then a symbol is not included in type A, the application will render it using type B, this is the "font fallback" I mentioned. If type B doesn't include it as well, then fallback to platform's font. Just sometimes the platform matched font is not the one user preferred, so the application level font...
Font fallback support