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chromium/third_party/blink/web_tests/external/wpt/css/css-display/display-contents-details-001-ref.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test Reference</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:[email protected]">
<details>
  <div>
    <summary>summary</summary>
    details
  </div>
</details>