backdrop-filter-reference-filter-mutated.html

<!doctype html>
<html class="reftest-wait">
<title>backdrop-filter: A reference filter is mutated</title>
<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
<link rel="match" href="reference/green-100x100.html">
<script src="/common/reftest-wait.js"></script>
<script src="/common/rendering-utils.js"></script>
<div style="width: 100px; height: 100px; backdrop-filter: url(#f)"></div>
<svg height="0">
  <defs>
    <filter id="f">
      <feFlood id="flood" flood-color="red"/>
    </filter>
  </defs>
</svg>
<script>
  waitForAtLeastOneFrame().then(() => {
    const flood = document.getElementById('flood');
    flood.setAttribute('flood-color', 'green');
    takeScreenshot();
  });
</script>

chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/backdrop-filter-reference-filter-mutated.html