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diff --git a/layout/reftests/layers/fixed-pos-scrolled-clip-opacity-inside-layerize.html b/layout/reftests/layers/fixed-pos-scrolled-clip-opacity-inside-layerize.html
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index 0000000000..a3a1e67651
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+++ b/layout/reftests/layers/fixed-pos-scrolled-clip-opacity-inside-layerize.html
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+<!DOCTYPE html>
+<html reftest-async-scroll
+      reftest-displayport-x="0" reftest-displayport-y="0"
+      reftest-displayport-w="800" reftest-displayport-h="2000"
+      reftest-async-scroll-x="0" reftest-async-scroll-y="200">
+
+<title>position:fixed with scrolled clip should prerender everything and correctly move the clip</title>
+
+<style>
+
+body {
+  margin: 0;
+  height: 4000px;
+}
+
+.blueBox {
+  margin: 10px;
+  width: 200px;
+  height: 200px;
+  box-sizing: border-box;
+  border: 1px solid blue;
+}
+
+.opacity {
+  opacity: 0.8;
+}
+
+.absoluteClip {
+  position: absolute;
+  top: 300px;
+  left: 100px;
+  width: 200px;
+  height: 200px;
+  clip: rect(auto auto auto auto);
+}
+
+.fixed {
+  position: fixed;
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  background: linear-gradient(lime 300px, black 0);
+}
+
+.absoluteCyanBox {
+  position: absolute;
+  top: 200px;
+  left: 400px;
+  width: 200px;
+  height: 200px;
+  box-sizing: border-box;
+  border: 1px solid cyan;
+}
+
+
+</style>
+
+<div class="blueBox" reftest-assigned-layer="page-background"></div>
+
+<div class="absoluteClip">
+  <div class="opacity">
+    <div class="fixed"></div>
+  </div>
+</div>
+
+<div class="absoluteCyanBox" reftest-assigned-layer="page-background"></div>