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chromium/content/test/data/accessibility/mac/attributes/ax-highest-editable-ancestor.html 

<!--
@SCRIPT:
  editable.accessibilityAttributeValue(AXHighestEditableAncestor)
  editable.accessibilityAttributeNames.has(AXHighestEditableAncestor)
  not_applicable.accessibilityAttributeValue(AXHighestEditableAncestor)
  not_applicable.accessibilityAttributeNames.has(AXHighestEditableAncestor)
  p.accessibilityAttributeValue(AXHighestEditableAncestor)
  p.accessibilityAttributeNames.has(AXHighestEditableAncestor)
  document.accessibilityAttributeNames.has(AXHighestEditableAncestor)
  document.accessibilityAttributeValue(AXHighestEditableAncestor)
-->
<!DOCTYPE html>
<textarea id="editable"></textarea>
<div id="not_applicable"></div>
<div contenteditable>
  <div contenteditable>
    <p id="p">Paragraph</p>
  <div>
</div>