I've seen quite a few epubs extracted from KF8 using KindleUnpack that are strewn with media queries which quite a few epub renderers disregard which can do odd things to the displayed pages. A calibre KF8 to epub conversion seems to get rid of the media queries but the replacement code is often a mess. I've also seen that in a few KFX conversions but since KFX is a pseudo-compiled format, it's hard to say what the original code looked like.
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