Sorry about the confusion I caused. The diversion into epub topics was to find out why an epub works on the screen and how it could be applied to xhtml. But it looks like the epub reader is told what size the screen is, and it confines whatever it displays to that screen area.
The html browser seems to vary the size of the screen along with the size of the text. I haven't yet found a way to convince it NOT to vary the size of the screen.
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