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Originally Posted by MGlitch
Page numbers - tell you precisely where you are in a book
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Faux pages don't tell you this. They present a multiple of some count of characters from some arbitrary position. And the accuracy is questionable. For example, faux page 32 in an ebook with only text and faux page 32 in an ebook with 16 full page illustrations up to that point won't line up.
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Percentages - tell you how far in a book you are in a book.
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Progress tells you the same information that faux page does if you were to divide the current faux page by the total number of faux pages and then divide by 100. Percentage can with sufficient precision provide the same information that faux page provides while also conveying a reasonable approximation of how much of the book is left in a single number or a position on a slider.
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Nothing at all - ebooks don't have pages, the inclusion of page numbers is a call back to physical books.
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In fact, some of Adobe's own reference material on ADE says as much. ADE pages are a convenience for typesetters and publishers to give them a rough guide to how many screens full of text an ebook on an ebook reader is. It's marketing. A book won't sell well if customers perceive it as being "too big".
If you need actual pages then you should use an image-based format like DjVu or a page definition language format like PDF which offer consistent 1:1 corespondance with their respective print editions and other devices.
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And in most casual use cases when reading you do not need to see either the page number, nor how far in you are. Having the info available in a pop up is thus best, especially with the inclusion of the progress bar giving you an easy to see rough estimate
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This is a different but related topic. It's where information should be displayed rather than what information is to be displayed.