I think that there is a fundamental problem here: many (major) players think about eBooks as "small web sites in a container". Hence, they have proposed web technologies (XHTML and HTML5) as the technological core of the EPUB format.
And I think this way of reasoning is simply wrong, and it generates very bad habits, like people not using the tags properly, i.e. not marking semantically the content of the eBooks, but just "drawing" them in the same way CSS are abused for web sites.
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