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>