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diff --git a/layout/reftests/z-index/overlayscrollbar-sorting-1.html b/layout/reftests/z-index/overlayscrollbar-sorting-1.html
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+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Test that overlay scrollbars are on top of positioned content</title>
+
+<style>
+
+#outer {
+  width: 200px;
+  height: 200px;
+  overflow: auto;
+}
+
+#content {
+  height: 400px;
+  background: cyan;
+  position: relative;
+  z-index: 1;
+}
+
+</style>
+
+<div id="outer"><div id="content"></div></div>