diff -r 000000000000 -r 6474c204b198 layout/reftests/css-required/css-required-style-2.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/reftests/css-required/css-required-style-2.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+input, textarea, select, button,
+*:optional {
+  visibility: hidden;
+}
+
+input[required]:required {
+  visibility: visible;
+}
+
+/* Override the default style. */
+:invalid {
+  box-shadow: none;
+}