File: 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>