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Thank you for the link. I shall attempt to call the marks ticks in future.
Attached is a tidier version of the example file I played around with. There are 11 entries in the TOC across heading levels 1 - 4.
Almost every section in the file has 60 single line paragraphs so you'd hope for ticks evenly spaced along the progress bar. However, as you can see in the attached image there are only 5 irregularly spaced ticks. (Since taking the photo I changed the stylesheet to put page breaks ahead of most headings but that doesn't change much.)
Towards the start of the epub there are two short use cases described where not having a tick becomes a hindrance. (Text books with chapters and sections; fiction anthologies with stories divided into chapters.)
However, I also discovered a few minutes ago that the absence of the tick is related to navigation to next/prev chapters. Multi swipe gestures in this epub only travel to the navPoints which have ticks associated with them.
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