Case 4 :
Web Developer defines that back button will be attached to header
This page declared "data-add-back-btn=header" to page
1. check and draw back button to header
<div data-role="page" data-add-back-btn="header">
<div data-role="header" data-position="fixed">
<h1>back button sample</h1>
</div>
<div data-role="content">
</div>
</div>