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@Divingduck: Good point about panose-1, I have special cased it so that the checker does not report it as an unrecognized property.
Unfortunately, the css library calibre uses -- cssutils is not very good for this purpose. The Book Check tool actually just intercepts its log messages and converts them into error entries. Therefore, there is no easy way to ignore some types as errors, as the errors are not really identified in any concrete way. That is why the error messages are also fairly cryptic. Still, I think having the ability to detect errors in CSS is valuable, despite the sub-optimal implementation.
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