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chromium/third_party/blink/web_tests/external/wpt/css/css-tables/collapsed-border-remove-row-group-ref.html 

<!doctype html>
<meta charset="utf-8">
<title>CSS test reference</title>
<style>
  table {
    border-collapse: collapse;
  }

  td {
    border-bottom: 10px solid;
  }
</style>
<table>
  <thead>
    <tr>
      <td>Something</td>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Body</td>
    </tr>
  </tbody>
</table>