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diff --git a/layout/reftests/bugs/376532-1-ref.html b/layout/reftests/bugs/376532-1-ref.html
new file mode 100644
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+++ b/layout/reftests/bugs/376532-1-ref.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<!-- Reftest for bug 376532: should show single missing glyph box for non-BMP
+     characters (not surrogates)
+     Test 1 uses a narrow paragraph with overflow-x: hidden so that if two
+     missing glyph boxes are displayed only one will be visible
+-->
+<html>
+ <head>
+  <meta http-equiv="content-type" content="text/html; charset=utf-8">
+ </head>
+  <style type="text/css">
+p {   
+  font-size: 36pt;
+}
+  </style>
+ <body>
+  <p>&#xddb0d;</p>
+ </body>
+</html>