Below code shows an example to pop up a floating window in HTML:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>jQuery Window CSS Styling Sample</title>
<link rel="stylesheet" href="../../jqwidgets/styles/jqx.base.css" type="text/css" />
<link rel="stylesheet" href="../../jqwidgets/styles/jqx.summer.css" type="text/css" />
<script type="text/javascript" src="../../scripts/jquery-1.8.2.min.js"></script>
<script type="text/javascript" src="../../jqwidgets/jqxcore.js"></script>
<script type="text/javascript" src="../../jqwidgets/jqxwindow.js"></script>
<script type="text/javascript">
$(document).ready(function () {
$("#jqxwindow").jqxWindow({ height: 500, width: 500, theme: 'summer' });
$("#jqxwindow").jqxWindow('setContent', '<iframe src="http://www.jqwidgets.com/" width="100%" height="100%"></iframe>');
});
</script>
</head>
<body>
<div id='jqxwindow'>
<div>
Header</div>
<div id='content'>
</div>
</div>
</body>
</html>
https://www.jqwidgets.com/community/topic/loading-the-content-of-a-windowpopup-into-an-iframe/