How to add zoom to turn.js

To use the new zoom feature of turn.js you need to insert the flipbook in a zoom viewport.

HTML

<div id="zoom-viewport">
   <div id="flipbook">
       <div>Page 1</div>
       <div>Page 2</div>
       <div>Page 3</div>
       <div>Page 4</div>
       <div>Page 5</div>
       <div>Page 6</div>
   </div>
</div>