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I'm willing to change it. It is hard-coded in the program, and was changed from 3 to 2.1 since it seemed 'closer' to EPUB 2. But as you have pointed out, EPUB 2's CSS isn't any specific version that is validated by the validator. If I recall, when I tested 2 I received other errors which were pretty annoying. Having it error on @font-face is a pain. I don't think dropping it to 2 will be good.
I'm thinking of putting it back to 3, and if it 'misses' some things because they are only valid in EPUB 3, well, that may be less people affected than if it stays 2.1. In any case, its only meant as quick check.
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