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chromium/content/test/data/accessibility/html/colgroup.html 

<!--
@AURALINUX-ALLOW:table-cell-index*
@BLINK-ALLOW:*ColumnCount*
@BLINK-ALLOW:*ColumnIndex*
@MAC-ALLOW:AXColumnIndexRange=*
@MAC-ALLOW:AXIndex=*
@MAC-ALLOW:AXRowIndexRange=*
@WIN-ALLOW:column_*
@WIN-ALLOW:row_*
@WIN-ALLOW:table*
-->
<!DOCTYPE html>
<html>
<body>

<table border=1>
  <colgroup>
    <col span="1" style="background-color:red">
    <col style="background-color:yellow">
  </colgroup>
  <tr>
    <th>Single</th>
    <th>Pair</th>
  </tr>
  <tr>
    <td>A</td>
    <td>AA</td>
  </tr>
</table>

</body>
</html>