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chromium/content/test/data/accessibility/mac/attributes/ax-aria-column-index.html 

<!--
@SCRIPT:
  tableCellAuto.accessibilityAttributeNames.has(AXARIAColumnIndex)
  tableCellAuto.accessibilityAttributeValue(AXARIAColumnIndex)
  tableCell.accessibilityAttributeNames.has(AXARIAColumnIndex)
  tableCell.accessibilityAttributeValue(AXARIAColumnIndex)
  div.accessibilityAttributeNames.has(AXARIAColumnIndex)
  div.accessibilityAttributeValue(AXARIAColumnIndex)
-->
<!DOCTYPE html>
<div role="table">
  <div role="row">
    <span id="tableCellAuto" role="cell">column 1</span>
  </div>
</div>
<div role="table">
  <div role="row">
    <span id="tableCell" role="cell" aria-colindex="2">column 2</span>
  </div>
</div>
<div id="div" aria-colindex="3" ></div>