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diff --git a/layout/base/tests/bug966992-1-ref.html b/layout/base/tests/bug966992-1-ref.html
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+++ b/layout/base/tests/bug966992-1-ref.html
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+<!DOCTYPE HTML>
+<html><head>
+    <meta charset="utf-8">
+    <title>Testcases for overflow-clip-box:content-box</title>
+    <style type="text/css">
+        html,body {
+            color:black; background-color:white; font:16px monospace; padding:0; margin:7px;
+        }
+.block {
+  border:1px solid grey; height:50px; width:200px; padding:20px;
+  overflow:auto; overflow-clip-box:padding-box;
+}
+.rel { position:relative; }
+.mask1 { position:absolute; width:20px; background:white; top:0; bottom:0; right:0; }
+mask {
+  display:block;
+  position:absolute;
+  left: -1px;
+  bottom: -1px;
+  height: 25px;
+  width: 80%;
+  background:black;
+}
+    </style>
+</head>
+<body>
+
+<div style="position:relative;">
+<div contenteditable=true spellcheck=false tabindex=0 id=x class="rel block">XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX<span style="padding-right:20px">X</span><div class=mask1></div></div>
+<mask></mask>
+</div>
+
+<script>
+var x = document.getElementById('x');
+x.focus();
+window.getSelection().collapse(x,0);
+</script>
+
+</body>
+</html>