Originally Posted by JSWolf
It doesn't matter that the spec says to ignore stuff. If epubcheck 1.1, 1.2, aND MAYBE 3.0 flags it as an error, then it won't be put up for sale.
So go put in the media queries to do the image selection based on screen size and see if it actually validates in all those versions of epubcheck.
Yup. Media queries pass validation in 1.1, 1.2, and 3.0.