<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<!DOCTYPE html>
<html>
<head>
<style>.lw { font-size: 60px; }</style>
</head>
<body>
<!-- Start your code here -->
<p class='lw'>Hello Weaver!</p>
<button onclick='changeParentBody()'>Change Parent Body</button>
<!-- End your code here -->
<script>
function changeParentBody() {
window.parent.document.body.innerHTML = '<h1> Content </h1><p>html test code </p>';
}
</script>
</body>
</html>
