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diff --git a/layout/reftests/w3c-css/received/css-namespaces-3/prefix-002.xml b/layout/reftests/w3c-css/received/css-namespaces-3/prefix-002.xml
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+++ b/layout/reftests/w3c-css/received/css-namespaces-3/prefix-002.xml
@@ -0,0 +1,17 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+ <head>
+  <link rel="author" title="Anne van Kesteren" href="http://annevankesteren.nl/"/>
+  <link rel="author" title="Opera Software ASA" href="http://opera.com/"/>
+  <link rel="help" href="http://www.w3.org/TR/css-namespaces-3/#prefixes"/>
+  <link rel="match" href="reftest/ref-lime-1.xml"/>
+  <title>CSS Namespaces Test Suite: empty string prefix (Explicit element namespace)</title>
+  <style>
+   @namespace foo "";
+   t { background:red }
+   foo|t { background:lime }
+  </style>
+ </head>
+ <body>
+  <p><t xmlns="">This sentence should have a green background.</t></p>
+ </body>
+</html>