[KevinH]

Okay, I checked the Images Reports code and the count value in that Report is only for direct usage by html files not css files. I will expand that count to include direct usage in css files as well in the Images report.

Deleting Unused Media does not use the Reports values in any way. As long as your css includes a proper url() in its property value, it should be handled properly by delete unused media.

Either way a test case would help.