Test the parsing of the image-set functions. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". Too many url parameters : image-set(url(#a #b) PASS cssRule is "" Too many url parameters : -webkit-image-set(url(#a #b) PASS cssRule is "" No x : image-set(url('#a') 1 PASS cssRule is "" No x : -webkit-image-set(url('#a') 1 PASS cssRule is "" No comma : image-set(url('#a') 1x url('#b') 2x PASS cssRule is "" No comma : -webkit-image-set(url('#a') 1x url('#b') 2x PASS cssRule is "" Too many scale factor parameters : image-set(url('#a') 1x 2x PASS cssRule is "" Too many scale factor parameters : -webkit-image-set(url('#a') 1x 2x PASS cssRule is "" PASS successfullyParsed is true TEST COMPLETE