Yes, it works fine on ePubs. I’ve been using it for years. The question is whether or not your
device supports the css…
Spoiler:
This is what I use:
Code:
p.first::first-line {font-variant:small-caps}
<p class="first">This is the first paragraph in the chapter.</p>
The Kobo uses different rendering software depending if it is loaded as a kepub vs. an ePub. That’s why you may be seeing a difference.
I’m not a kobo user - maybe someone else has a better answer - but can you update the software/firmware on the kobo??