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chromium/content/test/data/accessibility/mac/attributes/ax-dom-class-list.html 

<!--
@SCRIPT:
  class_list.accessibilityAttributeNames.has(AXDOMClassList)
  class_list.accessibilityAttributeValue(AXDOMClassList)
  empty.accessibilityAttributeNames.has(AXDOMClassList)
  empty.accessibilityAttributeValue(AXDOMClassList)
-->
<!DOCTYPE html>
<div id="class_list" class="firstclass secondclass">
<div id="empty"></div>