<!DOCTYPE html>
<html>
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>&lt;div&gt; with role checkbox; required state or property "aria-checked" value of "undefined"</title>
   </head>
   <body>
      <div id="test" tabindex="0" role="checkbox" aria-checked="undefined">Placeholder content</div>
      <div id="obj1">obj1</div>
      <div id="obj2">obj2</div>
   </body>
</html>