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chromium/third_party/blink/web_tests/external/wpt/svg/render/reftests/change-sync-for-nested-use.html 

<!doctype html>
<html class="reftest-wait">
<title>Change sync for nested use</title>
<link rel="match" href="change-sync-for-nested-use-ref.html">
<svg width="400" height="500" onload="main()">
  <rect id="r1" width="40" height="40" style="fill:red" />
  <rect id="r2" x="50" y="50" width="40" height="40" style="fill:gray" />
  <g id="g1">
    <use id="u1" x="120" href="#r1" />
    <use id="u2" x="120" href="#r2" />
    <rect x="120" y="120" width="50" height="50" style="fill:skyblue" />
  </g>
  <use id="u3" x="120" href="#g1" />
  <use id="u4" y="170" href="#u2" />
  <use id="u5" x="-30" y="220" href="#u2" />
</svg>

<script>
  function main() {
    let r1 = document.getElementById("r1"),
        r2 = document.getElementById("r2");

    requestAnimationFrame(() => requestAnimationFrame(() => {
      r1.style.fill = "navy";
      r2.style.fill = "purple";
      document.documentElement.removeAttribute("class");
    }));
  };
</script>
</html>