diff -r 000000000000 -r 6474c204b198 layout/reftests/css-ui-valid/output/style.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/reftests/css-ui-valid/output/style.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,22 @@
+/* Override default style */
+output {
+  color: black;
+}
+
+output.notvalid {
+  color: green;
+}
+output.notvalid:-moz-ui-valid {
+  color: red;
+}
+
+output.valid {
+  color: red;
+}
+output.valid:-moz-ui-valid {
+  color: green;
+}
+
+output.ref {
+  color: green;
+}