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73416ba
(Get the code!)
As requested, a sample epub3 attached here. There is only one link, located in the first paragraph. Clicking on the link should show footnote dialog as described. Oh yes, CJK font is also needed, which is not included in e-book (file size may become unnecessarily huge). I'm using Noto Serif CJK JP [1] in image attachments, but any fonts supporting Japanese would do.
[1] https:/