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diff --git a/layout/reftests/bugs/514917-1.html b/layout/reftests/bugs/514917-1.html
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+++ b/layout/reftests/bugs/514917-1.html
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+<!DOCTYPE HTML>
+<title>Testcase, bug 514917</title>
+<style type="text/css">
+
+body > div {
+  overflow: auto; /* to detect too much overflow, which is the bug here */
+  width: 200px;
+  height: 200px;
+}
+
+body > div > div {
+  width: 100px;
+  height: 100px;
+  box-shadow: blue 50px 50px;
+}
+
+body > div > div > div {
+  width: 160px;
+  height: 160px;
+  border: medium solid;
+}
+
+</style>
+<body>
+<div><div><div></div></div></div>
+</body>