Quote:
Originally Posted by DaleDe
As it should be! you can't know the page size of the device that will be showing the book.
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That's why we'd need some way of working with that.
Compare with horizontal positioning. You can't know the page width either, yet you can specify some text to be left-aligned, right-aligned or centered in a page, regardless of it's true size (within sensible limits).
But this can't be done with vertical layout, because there's no concept of page height (and if you set a <div>'s height to 50%, it's actually half the
width of the page!). The XHTML+CSS model works better with scrollable media than with paged media. While it could be tricky, there's no fundamental reason why vertical layout could not be added to ePUB.