diff -r 000000000000 -r 6474c204b198 layout/reftests/css-default/submit-button/default-submit-button-style.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/reftests/css-default/submit-button/default-submit-button-style.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,2 @@
+button { visibility: hidden; }
+button:default { visibility: visible; }