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Re:EPUB 3.3 becomes a W3C recommendation by Bilal_io on Wednesday May 31, 2023 @01:27AM (#36134771)
KDE's okular might be a good choice. I haven't personally used it for epub but I know it supports it.

https://okular.kde.org/

Re:EPUB 3.3 becomes a W3C recommendation by yepguy on Wednesday May 31, 2023 @10:42AM (#36138964)
Okular's epub rendering is awful. Nearly any other option will look better.