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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 their contents have a visible region that extends beyond the scrollbox clip, even through an opacity container layer</title>
+
+<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: 100px;
+ 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="opacity 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>
+