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					Originally Posted by  AlexBell
					 
				 
				No, I don't think that's true - or at least 
.spaceabove { margin-top: 1.0em; } 
.spacebelow { margin-bottom: 1.0em; } 
both work well in a test HTML/CSS file converted to Mobipocket by Calibre. 
			
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 That's what I mean, it is recognized by Calibre, but the Mobipocket itself does not have it, Calibre adds the margin-bottom to the margin-top of the following element and puts this in a "height" attribute, which is what Mobipocket uses.
I'm talking about the Mobipocket format, not the Creator or other converters.