border-collapse-dynamic-section.html

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-tables-3/">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<table style="border-collapse: collapse; width: 100px; background: red;">
  <tbody>
    <tr id="target" style="height: 50px; display: none;">
      <td style="border: solid green 25px; background: green; padding: 0;"></td>
    </tr>
  </tbody>
  <tbody>
    <tr style="height: 25px;">
      <td style="border: solid green 25px; padding: 0;"></td>
    </tr>
  </tbody>
</table>
<script>
document.body.offsetTop;
document.getElementById('target').style.display = '';
</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-tables/border-collapse-dynamic-section.html