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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/view-transition-name-is-backdrop-filter-root.html 

<!DOCTYPE html>
<html>
<title>View transitions: view-transition-name non-none value is a backdrop filter root</title>
<link rel="help" href="https://www.w3.org/TR/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">
<link rel="match" href="view-transition-name-is-backdrop-filter-root-ref.html">

<style>
.background {
  background: cyan;
  width: 200px;
  height: 200px;
}
.shared {
  background: blue;
  position: relative;
  left: 50px;
  top: 50px;
  width: 100px;
  height: 100px;
  view-transition-name: shared;
}
.filter {
  backdrop-filter: invert(1);
  position: relative;
  left: -50px;
  top: 30px;
  width: 200px;
  height: 40px;
}
</style>

<div class=background>
  <div class=shared>
    <div class=filter></div>
  </div>
</div>