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chromium/third_party/blink/web_tests/external/wpt/css/selectors/invalidation/part-pseudo.html 

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <title>CSS Selectors Invalidation: ::part()</title>
  <link rel="author" title="Steinar H. Gunderson" href="mailto:[email protected]">
  <link rel="help" href="https://drafts.csswg.org/css-shadow-parts/">
  <link rel="match" href="part-pseudo-ref.html">
  <style id="sheet">#host::part(green) { color: red; }</style>
  </head>
<body>
  <div id="host">
    <template shadowrootmode="open">
      <div>
        <div part="green">Should be green</div>
      </div>
    </template>
  </div>
  <script>
    document.body.offsetTop;
    sheet.innerText = "#host::part(green) { color: green; }";
  </script>
</body>