apache/cordova-plugin-file — pull request #55 by loufranco (2014-06-25 00:50:41+00:00)
Title: CB-6532 iOS: a cdvfile:// to a CSS file doesn't work in a link tag

The issue is that there's a bug in UTTypeCopyPreferredTagWithClass, It returns nil mimetype for css (sometimes -- it appears that it happens when there is no network). There is already a workaround for other files -- the JIRA case indicates that this might be true for fonts as well.