Originally Posted by Jellby
...While "height: 100%" looks perfect for that, it's behaviour is actually undefined, or at least in practice it is. Setting the height of <html> and <body> may do the trick in some cases, but not all. This is the reason why it is not possible to do this in ePub in a portable way.
This is not the ePub section but the Workshop section
For that reason I said that works in KINDLE
and not in ADE. You can set the height of the div/table as you wish and center the text (or other things) inside vertically.
In my attachment below, you can see a vertical centered text inside a block with a height of 200px (of course, you can set the height that you wish and in ems, pts, whatever). So, in KINDLE WORKS
; in ADE doesn't; in others devices, I don't know