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chromium/third_party/blink/web_tests/external/wpt/css/css-tables/chrome-rowspan-bug.html 

<!doctype html>
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<title>caption</title>
<meta name="flags" content="ahem">
<link rel="author" title="Aleks Totic" href="[email protected]" />
<link rel="help" href="https://crbug.com/1180592"/>
<style>
  main table {
    border-spacing: 0;
  }
  main table td {
    border: 1px solid black;
    padding: 0;
    width: 50px;
    height: 25px;
  }
</style>

<main>
  <table>
    <tbody>
      <tr>
        <td></td>
        <td id="target" rowspan=5></td>
        <td></td>
        <td></td>
      </tr>
      <tr>
        <td rowspan=5></td>
        <td rowspan=5></td>
        <td></td>
      </tr>
      <tr>
        <td></td>
      </tr>
    </tbody>
  </table>
</main>

<script>
  test(_ => {
    assert_equals(document.body.querySelector("#target").offsetHeight, 81);
  }, "table tracks correct use of rowspan");
</script>