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diff --git a/layout/reftests/async-scrolling/offscreen-prerendered-active-opacity.html b/layout/reftests/async-scrolling/offscreen-prerendered-active-opacity.html
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+++ b/layout/reftests/async-scrolling/offscreen-prerendered-active-opacity.html
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+<!DOCTYPE html>
+<html reftest-async-scroll>
+<meta charset="utf-8">
+<title>Active opacity should be rendered if it's inside the display port, even if it's currently offscreen</title>
+
+<style>
+
+.scrollbox {
+ border: 1px solid black;
+ width: 200px;
+ height: 200px;
+ overflow: scroll;
+ scrollbar-width: none;
+}
+
+.scrolledContent {
+ height: 1000px;
+}
+
+.opacity {
+ will-change: opacity;
+ opacity: 0.5;
+ margin-top: 250px;
+ width: 100px;
+ height: 100px;
+ box-sizing: border-box;
+ border: 1px solid blue;
+}
+
+
+</style>
+
+<div class="scrollbox"
+ reftest-displayport-x="0" reftest-displayport-y="0"
+ reftest-displayport-w="200" reftest-displayport-h="1000"
+ reftest-async-scroll-x="0" reftest-async-scroll-y="150">
+ <div class="scrolledContent">
+ <div class="opacity"></div>
+ </div>
+</div>