Case 3 :
Web Developer declare back btn option and make footer
back button displayed right bottom side of footer
<div data-role="page" data-add-Back-Btn="true">
<div data-role="header" data-position="fixed">
<h1>back button sample</h1>
</div>
<div data-role="content">
</div>
<div data-role="footer" data-position="fixed">
</div>
</div>