Reason for question:
issue of images bleeding off the page in publication
no guarantee that @scale_fit = yes will restrict the height of the container element (therefore height of image)
how does Publication Manager determine where to enter page breaks into a publication?
This is not determined by Publication Manager, this is determined by the publishing stylesheets that are used. The DITA-OT (open toolkit) is used to publish to the different output formats like PDF. You can find more information about the publishing in LiveContent in the documentation: http://docs.sdl.com/LiveContent/content/en-US/SDL%20LiveContent%20full%20documentation-v143/GUID-204A9AE6-8790-496B-9C41-D67C0E0D95FD
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