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

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