Prince does not seem to do any mathml linebreaking, is this because I need to specify some kind of css property or is it simply not yet implemented?
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MathML Line-breaking
Right, we don't automatically break MathML expressions over multiple lines yet, it would probably be a helpful feature to have when rendering complex equations.
MathML has been a lower implementation priority than other features; in fact at some point support for MathJax may make it unnecessary.