A perennial gripe of mine is that the Kobo doesn't support monospace out of the box the way the Kindle does. E.g.,
Code:
.monospace {
font-family: monospace;
}
Won't work unless you embed the font in the epub, or install one, Courier I think, and you have to name it a certain way.
So I'm guessing that none of those will work on a Kobo, although I don't know what would happen if you had embeded the font or installed Courier.