Test case details

Preparation Code

<div id=container>     <div id=header>1. header</div>     <div id=content>3. content</div>     <div id=thumbnails>2. thumbnails</div> </div> <script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

Test cases

Test #1

$('#header').after($('#thumbnails'));

Test #2

$('#thumbnails').insertAfter($('#header'));