ADE and calibre viewer almost certainly use a default in the region of 1.2em for paragraph line-height. This is a very sensible value to use and ensures that letters with "descenders", (g p q y), don't bump into tall letters on the next line. 1.0em is definitely NOT the default for line-height on all readers.
Do use 1.2em, or 1.1em or even 1.0em, (though this one really is a bit tight), or simply leave it to default as the OP suggested, (and you'll get something in the region of 1.2em on ADE based readers.)
Last edited by Agama; 05-07-2013 at 07:38 AM.
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