Thank you, Anak, for your advice! They are mainly based, you say it yourself, on pseudo-elements. I have given up to work with them for a long time, as there are many devices that have problems with them. And as my books are mostly aimed to be uploaded here, I try to avoid disturbances. But, for the use of my own, I shall try it.
By the way: My own books are transformed into Kepubs by j.goguen's extended driver.
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