#test1 {
  background-image: cross-fade(60% image(red), image(blue));
}
#ref1 {
  background-color: #906;
}

#test2 {
  background-image: cross-fade( image(red) 60%, image(blue));
}
#ref2 {
  background-color: #906;
}

#test3 {
  background-image: cross-fade( image(red) 60%, 40% image(blue));
}
#ref3 {
  background-color: #906;
}

#test4 {
  background-image: cross-fade( image(red) 60%, 40% image(blue), image(lime));
}
#ref4 {
  background-color: #906;
}

#test5 {
  background-image: cross-fade(image(lime), image(red) 60%, image(blue) 40%, image(lime));
}
#ref5 {
  background-color: #906;
}

#test6 {
  background-image: cross-fade(90% image(red), 60% image(blue));
}
#ref6 {
  background-color: #906;
}

#test7 {
  background-image: cross-fade(40% image(red), 20% image(blue));
}
#ref7 {
  background-color: #A059;
}

#test8 {
  background-image: cross-fade( image(red), image(blue), image(lime));
}
#ref8 {
  background-color: #555;
}

#test9 {
  background-image: cross-fade( image(red) 100%, 100% image(blue), image(lime) 100%);
}
#ref9 {
  background-color: #555;
}

#test10 {
  background-image: cross-fade(40% image(lime), image(red) 40%, image(blue) 40%, image(lime));
}
#ref10 {
  background-color: #555;
}

#test11 {
  background-image: cross-fade(image(red));
}
#ref11 {
  background-color: #F00;
}

#test12 {
  background-image: cross-fade(image(red) 0%);
}
#ref12 {
  background-color: #0000;
}

#test13 {
  background-image: cross-fade(image(red), image(lime), image(blue), image(white), image(black));
}
#ref13 {
  background-color: #666;
}