JSFiddle - React, Tailwind, and code Playground

HTML

<!doctype html>
<html>
<head>
    <meta charset="gbk" />
    <title></title>
</head>
<body>
    <div id="test" style="position: absolute;">
    </div>
    <script src="http://code.jquery.com/jquery-1.5b1.js"></script>
    <script>
        var doc=$('#test');
        alert(doc.offsetParent()[0]===document.body);
    </script>
</body>
</html>