<!DOCTYPE html>
<html>
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>&lt;div&gt; with role tablist; supported state or property "aria-level" value of "1"</title>
   </head>
   <body>
      <div id="test" role="tablist" aria-level="1">
         <div id="obj1" role="tab">obj1</div>
         <div role="tablist" aria-level="2">
            <div id="obj2" role="tab">obj2</div>
         </div>
      </div> 
   </body>
</html>