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You, of course, can continue to use the pseudo-elements, they just might not work. Assuming the Kobo is standards-compliant it will just not render with the pseudo-element css. It should just ignore that coding completely. You can, and should, set your css so that your book still looks acceptable if there is any coding that gets ignored.
If a device doesn't follow the standards then submit a complaint/bug report so they can get it fixed.
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