I've done some searching but I can't seem to find any documentation on "StyleHints". I'm using 11.3 on OS X High Sierra and there doesn't seem to be any built-in documentation. A search on this site also didn't turn up much. Is there any formal documentation? Has anyone posted a tutorial somewhere?
What is the context for this, that is, where is "StyleHints" used?
It can be seen in the Option Inspector: Formatting Options->PrivateFontOptions, for example.
See the quote in this answer:
and maybe you can find something useful in https://mathematica.stackexchange.com/search?q=stylehints