I assume that "the CSS looks correct" means that there is an entry for small caps, using the prescribed syntax for small capitals; and that this is used inside the generated ePUb?
Support for CSS varies enormously among various devices and software, from nothing-at-all to the extremely advanced CSS3.0 of the iPad's iBook. So, "check and confirm "what? There is nothing we can say about this particular problem because you failed to say on what device you have this problem. Even so, other devices may or may not have the same problem -- depending on their level of CSS support.
Doesn’t display correctly WHERE?
@Jongware/Bob, thanks for your responses, I checked the ePub output using 'Adobe Digital Editions', and getting the same issue in 'Calibre', but in 'Sigil', it looks fine.
In CSS it has been declared like below:
font-variant : small-caps;
Here 'SmallCaps' is the character style applied for the 'small caps' contents.
Quite frankly, ADE is the last place I’d check an epub. There is no substitute for putting the epub on the device and testing it there.
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And if that device does not show small caps, to one to send your complaints to is the manufacturer, since in this case it seems InDesign does export properly.[*]
But you did the right thing, first checking if the expected CSS attribute indeed appear in the exported file. There are lots of text attributes that are *not* supported in CSS, and thus will not ever end up there.
[*] (Ah -- and it would seem your first complaint should go to Adobe Re: their own ADE. )
Thanks Bob, then the ePub is already correct like showing correctly in other viewers.