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chromium/third_party/blink/web_tests/external/wpt/css/css-masking/clip-path/clip-path-svg-invalidate.html 

<!doctype html>
<html class="reftest-wait">
<title>Clip Path: invalidate composited clip-path via SVG</title>
<link rel="author" title="Chris Harrelson" href="mailto:[email protected]">
<link rel="help" href="http://www.w3.org/TR/css-masking-1/#clipping-paths">
<link rel="help" href="http://www.w3.org/TR/css-masking-1/#the-clip-path">
<link rel="match" href="clip-path-svg-invalidate-ref.html">
<script src="/common/reftest-wait.js"></script>

<style>
  body {
    margin: 0;
  }
  div {
    height: 500px;
    background: black;
    clip-path: url(#clip);
    will-change: transform;
  }
  svg {
    width: 0;
    height: 0;
  }
</style>

<div></div>

<svg viewBox="0 0 1 1">
  <clipPath id="clip" clipPathUnits="objectBoundingBox">
    <polygon points="0,0 0.5,0.5 1,0" />
  </clipPath>
</svg>

<script>
  const polygon = document.querySelector("polygon");
  const points = "0,0 0.5,1 1,0";
  requestAnimationFrame(() => requestAnimationFrame(() => {
      polygon.setAttribute("points", points);
      takeScreenshot();
  }));
</script>