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chromium/content/test/data/accessibility/mac/attributes/ax-owns.html 

<!--
@SCRIPT:
  // Combobox input with active descendant.
  combobox.accessibilityAttributeNames.has(AXOwns)
  combobox.accessibilityAttributeValue(AXOwns)
  // Combobox input with no selection container
  combobox_no_descendant.accessibilityAttributeValue(AXOwns)
  // Div with role combobox (does not support AXOwns).
  div.accessibilityAttributeNames.has(AXOwns)
  // Input without role combobox (does support AXOwns)
  input_not_combobox.accessibilityAttributeNames.has(AXOwns)
-->
<!DOCTYPE html>
<input id="combobox" role="combobox" aria-activedescendant="item">
<ul role="listbox">
  <li id="item" role="option"></li>
</ul>

<input id="combobox_no_descendant" role="combobox" aria-activedescendant="div">
<div id="div"></div>

<div id="div" role="combobox"></div>

<input id="input_not_combobox"></div>