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chromium/third_party/blink/web_tests/external/wpt/css/css-tables/tentative/paint/collapsed-border-large-cell.html 

<!DOCTYPE html>
<title>Collapsed borders of large cells</title>
<link rel="author" title="Aleks Totic" href="[email protected]" />
<link rel="help" href="https://www.w3.org/TR/css-tables-3/#drawing-backgrounds-and-borders" />
<link rel="match" href="collapsed-border-large-cell-ref.html" />
<meta name="assert" content="Collapsed borders of large cells can collapse a single edge.">
<style>
main * {
  box-sizing: border-box;
}
main table {
  border-collapse: collapse;
}
main td {
  padding:0px;
  width: 50px;
  height:50px;
  border: 2px solid black;
}
</style>
<main>
  <table>
    <colgroup style="border:6px solid blue;background:rgba(0,0,255,0.5);"></colgroup>
    <tr>
      <td rowspan=4></td>
      <td></td>
      <td></td>
      <td></td>
    </tr>
    <tr>
      <td rowspan=2 colspan=2 style="border:4px solid green; background: rgba(0,255,0, 0.5);"></td>
      <td style="border: 6px solid yellow;background:rgba(255,255, 0, 0.5)"></td>
    </tr>
      <td></td>
    <tr>
      <td colspan=3 style="border:6px solid orange;background:rgba(255,165,0,0.5)"></td>
    </tr>
  </table>
</main>