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This could be caused by any of the following:
1. A bug in which older versions of iBooks barf on SVG <text> elements that contain multiple <tspan> elements.
2. A font whose metrics are incorrect, resulting in a zero computed line height.
3. Incorrect CSS that specifies a zero line height.
Or it could probably be caused by any number of other things. It would help to know:
1. The reader you're using (and possibly the version)
2. A trimmed-down snippet of HTML and CSS that reproduces the problem
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