The Autonym font is not designed to display arbitrary text in all scripts.
For example it won't display arbitrary text in Chinese, or does not have correct coverage for displaying IPA transcriptions, and not even toponyms like country names (unless a few of them are needed later in the ULS if it has to include a regional selector for locales, instead of just a language selector: my opinion is that you'll select first the language using the Autonym font, but selection of regions will be fully translated with the rest of the interface, using a better font designed for that language with a more complete coverage of its native script).
The Autonym font also does not need coverage of most symbols, punctuations and digits (unless those characters needed for displaying some language names, including with disambiguation in parentheses).
However it should work to display at least all the language names listed in the ULS (or now proposed to be used in all wikis in language navigation bars, example at the bottom of Meta-Wiki main page). This means that its developement shoud monitor the evolution of the list of languages supported by Wikimedia (this font is not required to display all the many possible native language names in their script, until they get some some support in a Wikimedia site). This means that this font is only meant for usage in Wikimedia sites, or in sites that don't need more language names than Wikimedia.
Problems:
- the font does not work when rendering some languages (supported by Wikimedia sites) in their native scripts (severe issue, we only see square boxes).
Demos (using<bdi class="autonym" lang="my">{{#language:my}}</bdi>
):- Church Slavic (
cu
)- словѣньскъ / ⰔⰎⰑⰂⰡⰐⰠⰔⰍⰟ
- Sichuan Yi (
ii
)- ꆇꉙ
- Burmese (
my
)- မြန်မာဘာသာ (may render however in some wiki sites that provide some font fallbacks)
- Church Slavic (
- the font is poorly hinted for Georgian and some Indic language names in their native scripts, which are difficult to read:
- Georgian (
ka
)- ქართული
- Sinhala (
si
)- සිංහල
- Georgian (