<!DOCTYPE html>
<html>
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>&lt;div&gt; with role treeitem; inherited supported state or property "aria-checked" value
         of "mixed"
      </title>
   </head>
   <body>
      <div role="tree">
         <div id="test" role="treeitem" aria-checked="mixed">Placeholder content</div>
      </div>
   </body>
</html>