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chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/backdrop-filter-paint-order.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>backdrop-filter: Only filter objects painted before</title>
<link rel="author" href="mailto:[email protected]">
<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
<link rel="match"  href="backdrop-filter-paint-order-ref.html">

<div>
  <p>Expected: A pure white box with a blue border, surrounded by green.<br>
  No green should be observed within the white box.<br>
  No dark/black should be observed within the white box either.</p>
</div>

<div class="filterbox"></div>
<div class="greenbox top"></div>
<div class="greenbox right"></div>
<div class="greenbox bottom"></div>
<style>
.filterbox {
  position: absolute;
  width: 100px;
  height: 100px;
  top: 150px;
  left: 0px;
  border: 1px solid blue;
  backdrop-filter: blur(20px);
}
.greenbox {
  position:absolute;
  width: 150px;
  height: 50px;
  background: green;
}
.top {
  top:100px;
  left: 10px;
}
.right {
  top:130px;
  left: 102px;
  width: 58px;
  height: 150px;
}
.bottom {
  top:252px;
  left: 10px;
}
</style>