<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta charset="utf-8">
<title>The ASR for the opacity item is the root scroll frame instead of the subframe.</title>

<style>

.outer {
  /* avoid event regions messing with our demonstration */
  pointer-events: none;
  /* make sure the .outer opacity item has the root scroll frame as its ASR */
  background: rgba(0, 0, 0, 0.1);
}

.opacity {
  opacity: 0.8;
}

.scrollFrameWrapper {
  /* clips off .scrollFrame's scrollbar */
  margin: 100px;
  overflow: hidden;
}

.scrollFrame {
  height: 300px;
  margin-right: -20px;
  padding-right: 20px;
  overflow: hidden;
}

.scrolledContents {
  height: 1000px;
  width: 200px;
  border: 5px solid black;
  pointer-events: auto;
}

</style>

</head><body>

<div class="opacity outer">
  <div class="opacity inner">
    <div class="scrollFrameWrapper">
      <div class="scrollFrame">
        <div class="scrolledContents"></div>
      </div>
    </div>
  </div>
</div>
</body></html>