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chromium/content/test/data/accessibility/aria/aria-listbox-aria-selected.html 

<!--
@MAC-ALLOW:AXFocusable
@MAC-ALLOW:AXTitle
@MAC-ALLOW:AXOrientation
@MAC-ALLOW:AXSelected=*
@MAC-ALLOW:AXSelectedChildren=*
@MAC-ALLOW:AXVisibleChildren
@WIN-ALLOW:ia2_hypertext=*
-->
<html>
<body>
<div role="listbox" aria-multiselectable="true" aria-activedescendant="it1">
  <div id="it1" role="option">Item 1</div>
  <div id="it2" role="option">Item 2</div>
  <div id="it3" aria-selected="false" role="option">Item 3</div>
  <div id="it4" aria-selected="true" role="option">Item 4</div>
  <div id="it5" aria-selected="true" role="option">Item 5</div>
</div>
</body>
</html>