Where can I find documentation on "StyleHints"?

Questions
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1

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?

Thanks.

2

What is the context for this, that is, where is "StyleHints" used?

3

It can be seen in the Option Inspector: Formatting Options->PrivateFontOptions, for example.

4

See the quote in this answer:

https://mathematica.stackexchange.com/a/171237/5478

and maybe you can find something useful in https://mathematica.stackexchange.com/search?q=stylehints