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However you only link TOC to Chapters in real ebooks (and it can be automatic). The two-way links are really only for asides and footnotes because there is no "bottom of page" / footer / header in any real ebook format.
PDFs are electronic, but not ebooks. Fixed layout "ebooks" are simply a less portable version of PDFs and not proper ebooks. Real ebooks flow but are paginated for the window or screen size. Like picking a paper size equal to viewport/window size and doing "print preview" in a browser.
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