Simply by adding a css rule  font-variant: small-caps; and see whether you see them.

Or go to http://www.w3schools.com/CSS/tryit.asp?filename=trycss_font-variant
If you can see them with safari, then it's ok.

I know that in older versions of Safari it didn't work, which was disappointing as it's not an esoteric property.

There are no Borg. All resistance is fertile.