There was a recent discussion of using negative margins to get more use of screen real estate on Kindles. When trying that I modified a public domain EPUB to use negative margins and found that in the calibre viewer it does not let me switch pages when an HTML file boundary is reached.
Also, if I jump ahead using the scroll bar and then page backward to a chapter boundary I receive the following error:
Quote:
calibre, version 5.2.0
ERROR: Unhandled error: Uncaught TypeError: Cannot read property 'cols_left' of null
Error at userscript:viewer.js:21946:41
Traceback (most recent call last):
at ScrollResizeBugWatcher.check_for_resize_bug (userscript:viewer.js:21724:29)
at ScrollResizeBugWatcher.redo_scroll (userscript:viewer.js:21739:22)
at ScrollResizeBugWatcher.scroll_to_previous_position [as last_command] (userscript:viewer.js:21946:41)
TypeError: Cannot read property 'cols_left' of null
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This is calibre 5.2.0 64-bit under Windows 10.
This might be a different problem from the OP. If so I apologize for derailing.