<html>
<head>
<meta charset="utf-8">
</head>
<body>
<p>HELLO</p>
<div data-role="collapsible-set" data-content-theme="c" data-inset="true">
<div data-role="collapsible" data-collapsed="true">
<h2>Elem1</h2>
<p>Hello World</p>
</div>
<div data-role="collapsible" data-collapsed="true">
<h2>Elem2</h2>
<p>Hollow World</p>
</div>
</div>
</body>
</html>