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chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/repaint-added-backdrop-filter.html 

<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>backdrop-filter: Correctly repaint added backdrop-filter</title>
<link rel="author" href="mailto:[email protected]">
<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
<link rel="match" href="reference/repaint-added-backdrop-filter-ref.html">
<script src="/common/reftest-wait.js"></script>

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

<div id="filter"></div>

<style>
  #filter {
    width: 100px;
    height: 100px;
    backdrop-filter: none;
    will-change: opacity;
  }
</style>

<script>
  function doTest() {
    requestAnimationFrame(function() {
      requestAnimationFrame(function() {
        document.getElementById('filter').style.backdropFilter = 'invert(1)';
        takeScreenshot();
      });
    });
  }
  window.addEventListener('load', doTest, false);
</script>