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diff --git a/layout/reftests/bugs/424236-9-ref.html b/layout/reftests/bugs/424236-9-ref.html
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index 0000000000..6c3dea9f7b
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+++ b/layout/reftests/bugs/424236-9-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
+        "http://www.w3.org/TR/html4/strict.dtd">
+<html lang="en-US">
+<head>
+        <title>reftest, bug 424236</title>
+        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+        <meta http-equiv="Content-Style-Type" content="text/css">
+        <style type="text/css">
+
+        body { font-size: 16px; }
+        * { -moz-outline-offset: -1px; outline-offset: -1px; }
+        body > span { outline: 1px dotted black; }
+        /* can't compare to border combined with negative margin because of
+           margin collapsing */
+        body > div { display: block; outline: 1px dotted black; width: 10em; }
+        body > div + span + div { width: 5em; }
+
+        </style>
+</head>
+<body>
+
+<div>text</div><span>Some words that must be wider than 10em</span><div>text</div>
+
+</body>
+</html>