@DNSB, @kovidgoyal
Thank you for your replies.
What-is-visible-on-screen may be arbitrary, but what is within a single web page - compare the browser case - and is there nothing comparable in Calibre to a single web page? I thought there was, which is why, initially, I wrote of a 'page' displayed by Calibre. But I began to doubt that there were pages in Calibre, so I moved to speaking of what was visible on the screen. Yet, do eBooks not have pages?
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