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+<!DOCTYPE html>
+<html lang="en" reftest-async-scroll>
+<meta charset="utf-8">
+<title>Scrollboxes with uniform backgrounds should pull that color into their contents, even if these contents are wider than the uniform area behind the scrollbox</title>
+<!--
+  Very similar to pull-background-displayport-2.html, but with a .scrolled element that is
+  wider than the scrollbox.
+-->
+
+<style>
+
+div {
+  min-height: 50px;
+  box-model: border-box;
+}
+
+.first, .second {
+  border: 1px solid blue;
+  margin: 50px 0;
+}
+
+.border {
+  border: 1px solid black;
+}
+
+.scrollable {
+  height: 150px;
+  overflow: auto;
+}
+
+.scrollarea {
+  width: 5000px;
+  border: none;
+  padding: 10px 0 20px;
+  height: auto;
+}
+
+.scrolled {
+  margin-left: 220px;
+  width: 2000px;
+  height: 100px;
+  border-color: red;
+}
+
+.opacity {
+  opacity: 0.9;
+}
+
+body {
+  margin: 0;
+  padding: 0 100px;
+  height: 3000px;
+}
+
+</style>
+
+<div class="first" reftest-assigned-layer="page-background">
+  <!--
+    This is just a regular box, it should end up in the page background layer.
+  -->
+</div>
+
+<div class="opacity border">
+  <div class="scrollable"
+       reftest-displayport-x="0" reftest-displayport-y="0"
+       reftest-displayport-w="2000" reftest-displayport-h="200">
+    <div class="scrollarea">
+      <div class="scrolled border reftest-opaque-layer">
+        <!--
+          The background of .scrollable is uniform and opaque,
+          .scrolled should be able to pull up that background color and become
+          opaque itself.
+        -->
+      </div>
+    </div>
+  </div>
+</div>
+
+<div class="second" reftest-assigned-layer="page-background">
+  <!--
+    This should share a layer with .first and the page background.
+  -->
+</div>
+
+<script>
+
+var scrollable = document.querySelector(".scrollable");
+
+// Make .scrollable start out with active scrolling.
+scrollable.scrollLeft = 0;
+scrollable.scrollLeft = 20;
+
+</script>
+