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chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/backdrop-filter-plus-opacity.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>backdrop-filter: Correctly apply backdrop-filter with opacity</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-plus-opacity-ref.html">

<p>Expected: A green box.</p>

<div class="greenbox"></div>
<div class="filter"></div>

<style>
.greenbox {
  position: absolute;
  background: green;
  width: 100px;
  height: 100px;
  top: 100px;
  left: 60px;
}
.filter {
  position: absolute;
  width: 200px;
  height: 200px;
  top: 50px;
  left: 10px;
  backdrop-filter: invert(1);
  opacity: 0;
}
</style>