diff -r 000000000000 -r 6474c204b198 layout/reftests/w3c-css/submitted/variables/support/external-variable-reference.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/reftests/w3c-css/submitted/variables/support/external-variable-reference.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+:root {
+  --a: green;
+}
+p {
+  color: var(--a);
+}