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* The book illustrations are usually black on transparent. In a dark theme, they are black on black, therefore invisible. Most readers invert them to be white-on-transparent (or black), so they still are contrast and visible.
* The footnote markers are small hyperlinks which lead to the text of the footnote elsewhere, usually in the end of the book. There is no button to go back to the previous position, and no usual keyboard shortcuts work.
* The book was an FB2 file about 4000 pages long.
* FB2 files with 3 level headers show only the first two.
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