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diff --git a/layout/reftests/reftest-sanity/reftest-assigned-layer-fail-4.html b/layout/reftests/reftest-sanity/reftest-assigned-layer-fail-4.html
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+++ b/layout/reftests/reftest-sanity/reftest-assigned-layer-fail-4.html
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+<!DOCTYPE html>
+<html lang="en">
+<meta charset="utf-8">
+<title>This test will fail because the some-other-layer gets merged into the page background layer</title>
+
+<style>
+
+.content {
+ box-sizing: border-box;
+ width: 200px;
+ height: 200px;
+ border: 1px solid black;
+ margin: 10px;
+}
+
+.relative {
+ position: relative;
+}
+
+.fixed {
+ position: fixed;
+ top: 140px;
+ left: 140px;
+}
+
+.low-z {
+ z-index: 1;
+}
+
+.mid-z {
+ z-index: 2;
+}
+
+.high-z {
+ z-index: 3;
+}
+
+.opaque-background {
+ background-color: white;
+}
+
+body {
+ height: 4000px;
+}
+
+</style>
+
+<div class="content relative low-z" reftest-assigned-layer="page-background"></div>
+
+<div class="fixed opaque-background content mid-z" reftest-assigned-layer="fixed-layer"></div>
+
+<div class="content relative low-z" reftest-assigned-layer="some-other-layer"></div>