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chromium/content/test/data/accessibility/mac/methods/accessibility-column-header-ui-elements.html 

<!--
@SCRIPT:
  table.accessibilityColumnHeaderUIElements
  rowheader.accessibilityColumnHeaderUIElements
  cell.accessibilityColumnHeaderUIElements
  columnheader1.accessibilityColumnHeaderUIElements
  columnheader2.accessibilityColumnHeaderUIElements
-->
<!DOCTYPE html>
<table id="table" border=1>
  <tr>
    <th id="columnheader1">columnheader1</th>
    <th id="columnheader2">columnheader2</th>
  </tr>
  <tr>
    <th id="rowheader">rowheader</th>
    <td id="cell">cell</td>
  </tr>
</table>