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