Mobi favours very much the "leave it to the reader" approach. Generally speaking, in a Mobi book, depending on the particular implementation of the reading software one is using, the user can select the type face, the font size, whether the text is left or fully justified, the margin size, etc.
In Sony's BBeB book format, on the other hand, all those decisions are made by the book creator, and the reader has little or no control over the display, other than to alter the font size.
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