Quote:
Originally Posted by theducks
Larger side margins were because of the edge of the paper or signature (bound edge) and tolerances (Yes, I have had print books that had bad printing pages). Most devices have Bezels, so all the side margin needed is to allow for overscan allowance (~5px seems to do the trick).
And who are they kidding with line spacing > 1.4 for the main work 
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And then there is always the practical: how would you hold the book with no margins?
As far as overscan, I thought with LCD and eink displays there is no overscan; overscan was an analog thing?