[gmw]

epub supports a pageList definition to allow publishers to describe page references explicitly (see that Safari Books Online link in my prior post), but no one uses it (that I know of, or if they do use it, no reader implements it).

ADE implements support for a page-map definition for the same purpose, but I've never come across a book that uses it. Without that page-map definition ADE will revert to an algorithm (as described in my previous post) that gives a fixed page count regardless of font and screen sizes. Obviously it will be rare that these arbitrary "page" references match what is actually displayed on the screen, but it is close enough (typically the same page number might display for a few screen refreshes), and consistent enough, to be useful.