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+<!DOCTYPE html>
+<html lang="en">
+<meta charset="utf-8">
+<title>The fixed background should not cause .inner to move to a different layer than .outer</title>
+
+<style>
+
+body {
+ margin: 0;
+ height: 3000px;
+}
+
+.outer {
+ border: 1px solid black;
+ margin: 10px;
+}
+
+.outer > div {
+ margin: 10px;
+}
+
+.fixed-bg {
+ height: 100px;
+ background-image: linear-gradient(lime, lime);
+ background-attachment: fixed;
+}
+
+.inner {
+ border: 1px solid blue;
+ padding: 20px;
+}
+
+</style>
+
+<div class="outer" reftest-assigned-layer="page-background">
+ <!-- .inner and .fixed-bg do not overlap, so .inner should be merged into
+ the same layer as .outer. -->
+ <div class="fixed-bg"></div>
+ <div class="inner" reftest-assigned-layer="page-background"></div>
+</div>