Adding Brion since I think he has done a lot with this (feel free to correct me!)
Example of error: http://www.pidgi.net/wiki/File_talk:Mario_Kart_TV_logo_(alt)_-_Mario_Kart_8.svg The code speaks for itself. srcset=" 1.5x, 2x" Nothing is being generated for these, leaving the image as a broken link in browsers that support the property and fit the criteria.
Version: unspecified
Severity: normal