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chromium/third_party/blink/web_tests/external/wpt/css/css-position/position-relative-008.html 

<!DOCTYPE html>
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1227884">
<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
<meta name="assert" content="top: 100% doesn't resolve if the parent doesn't have a height specified.">
<p>Test passes if there is a filled green square.</p>
<table style="border-spacing: 0; background: red;">
  <tbody>
    <tr style="position: relative; top: 100%;">
      <td style="padding: 0;">
        <div style="width: 100px; height: 100px; background: green;"></div>
      </td>
    </tr>
  </tbody>
</table>