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diff --git a/layout/reftests/layers/component-alpha-exit-1-ref.html b/layout/reftests/layers/component-alpha-exit-1-ref.html
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+++ b/layout/reftests/layers/component-alpha-exit-1-ref.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>Reference for test transition from component-alpha layer to single-alpha layer</title>
+<script type="text/javascript">
+document.addEventListener("MozReftestInvalidate", function scrollDownAllTheWay () {
+  var scrollbox = document.getElementById("scrollbox");
+  scrollbox.scrollTop = 1000;
+  document.documentElement.className = "";
+}, false);
+</script>
+<style>
+#scrollbox {
+  margin: 20px;
+  width: 300px;
+  height: 400px;
+  overflow-y: hidden;
+  background: -moz-linear-gradient(#FFF, #FFF);
+}
+
+#inner {
+  background-color: #000;
+  padding-bottom: 415px;
+}
+</style>
+
+<div id="scrollbox">
+  <div id="inner">
+    
+  </div>
+</div>