Tom, This info is in the hOCR spec <https://github.com/kba/hocr-spec/blob/master/hocr-spec.md> (as mentioned by the OP), but maybe it's not so clear to understand. I could add this explanation along with a sketch to the FAQs if this is of common interest. I just don't want to be scolded for littering the wiki with possibly redundant information.
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