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+<!DOCTYPE html>
+<html lang="en" reftest-async-scroll>
+<meta charset="utf-8">
+<title>Perspective scrolling</title>
+<style>
+html {
+ height: 100%;
+ overflow: hidden;
+}
+
+body {
+ overflow: auto;
+ height: 100%;
+ scrollbar-width: none;
+ margin: 0;
+}
+
+.scene {
+ position: relative;
+ width: 200px;
+ height: 200px;
+ perspective: 100px;
+ transform-style: preserve-3d;
+}
+
+.face {
+ position: absolute;
+ width: 200px;
+ height: 200px;
+ top: 0;
+ left: 0;
+}
+
+.front {
+ background-color: lime;
+}
+
+/*
+ * This one should never be visible, and should be always
+ * behind the front face.
+ */
+.back {
+ width: 400px;
+ height: 400px;
+ top: -100px;
+ left: -100px;
+ transform: translateZ(-100px);
+ background-color: red;
+}
+</style>
+
+<body 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">
+<div style="height: 200px"></div>
+<div class="scene">
+ <div class="face front"></div>
+ <div class="face back"></div>
+</div>
+<div style="height: 5000px"></div>