Steps to replicate the issue (include links if applicable):
- \ca is a whitelisted command in chemistry mode
What happens?:
The following error is shown
Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. TeX parse error: Undefined control sequence \ca"): {\displaystyle {\ce {\ca{x}}}}
https://www.mediawiki.org/w/index.php?title=User:Physikerwelt/sandbox/ca&oldid=5625515
What should have happened instead?:
It should show an error message that the command ca is not supported
Software version (skip for WMF-hosted wikis like Wikipedia):
Other information (browser name/version, screenshots, etc.):
