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chromium/third_party/blink/web_tests/external/wpt/svg/painting/scripted/marker-element-added.html 

<!doctype html>
<html class="reftest-wait">
<title>&lt;marker> element added after first paint</title>
<script src="/common/reftest-wait.js"></script>
<script src="/common/rendering-utils.js"></script>
<link rel="match" href="../../struct/reftests/reference/green-100x100.html">
<svg>
  <path d="M0,0h100" marker-start="url(#m)"/>
</svg>
<script>
  function createSvgElement(name, attrData) {
    const svgNs = 'http://www.w3.org/2000/svg';
    const element = document.createElementNS(svgNs, name);
    attrData.forEach(([name, value]) => element.setAttribute(name, value));
    return element;
  }
  waitForAtLeastOneFrame().then(() => {
    const svgNs = 'http://www.w3.org/2000/svg';
    const markerElement = createSvgElement('marker', [
      ['id', 'm'], ['orient', '0'], ['overflow', 'visible']
    ]);
    markerElement.appendChild(createSvgElement('rect', [
      ['width', '100'], ['height', '100'], ['fill', 'green']
    ]));
    const svg = document.querySelector('svg');
    svg.insertBefore(markerElement, svg.firstElementChild);
    takeScreenshot();
  });
</script>