diff -r 000000000000 -r 6474c204b198 editor/reftests/xul/placeholder-reset.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/editor/reftests/xul/placeholder-reset.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+@namespace url('http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul');
+@namespace html url('http://www.w3.org/1999/xhtml');
+
+/* We need to have a non-transparent placeholder so we can test it. */
+html|input::-moz-placeholder {
+  opacity: 1.0;
+  color: graytext;
+}
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