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chromium/content/test/data/accessibility/win/ia2/iaccessibletable/iaccessibletable-selected-columns.html 

<!--
@SCRIPT:
  grid.QueryInterface(IAccessibleTable).selectedColumns
-->
<!DOCTYPE html>
<table role="grid" id="grid">
  <tr>
    <td aria-selected="true">cell</td>
  </tr>
</table>