Codebase Browser
chromium
Go to App

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

<!--
@SCRIPT:
  table.accessibilityAttributeNames.has(AXColumnHeaderUIElements)
  table.accessibilityAttributeValue(AXColumnHeaderUIElements)
  cell.accessibilityAttributeNames.has(AXColumnHeaderUIElements)
  cell.accessibilityAttributeValue(AXColumnHeaderUIElements)
  columnheader.accessibilityAttributeNames.has(AXColumnHeaderUIElements)
  columnheader.accessibilityAttributeValue(AXColumnHeaderUIElements)
-->
<!DOCTYPE html>
<table id="table" border=1>
  <tr>
    <th id="columnheader">columnheader</th>
  </tr>
  <tr>
    <td id="cell">cell</td>
  </tr>
</table>