Case 6 :
Web Developer declared only footer in page
but need to add back button dynamically in header
call page("addBackBtn", target) API
<div data-role="page">
<div data-role="header" data-position="fixed">
<h1>back button sample</h1>
</div>
<div data-role="content">
</div>
<div data-role="footer">
</div>
</div>
<script>
$(".ui-page-active").page( "addBackBtn", "header" );
</script>