There you go.
But either way, Flightcrew probably shouldn't be giving it the old "This resource is present in the OPF <manifest>, but it's not reachable (it's unused)
" yada-yada. If having manifested resources that are only referenced via CSS (not in any xhtml) is valid under any circumstances at all
, it (Flightcrew) should probably understand that such resources are
, in fact, being used.