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diff --git a/layout/base/tests/bug966992-3.html b/layout/base/tests/bug966992-3.html
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+++ b/layout/base/tests/bug966992-3.html
@@ -0,0 +1,26 @@
+<!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;
+        }
+    div {
+      width: 100px; padding-right:50px; overflow-clip-box:content-box;
+      overflow:hidden;
+    }
+    </style>
+</head>
+<body>
+
+<div contenteditable=true spellcheck=false tabindex=0 id=x class="block">XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX</div>
+
+<script>
+var x = document.getElementById('x');
+x.focus();
+x.scrollLeft=100000
+window.getSelection().collapse(x,1);
+</script>
+</body>
+</html>