vaadin 7 sampler flip effect

Hi everyone, vaadin 7 sampler is not open source but does anyone know how to get the nice flip effect while navigating between tabs description and source visible here
Name of used is library or CSS ?!

It’s done with just CSS, using animation with transform properties. The animation is started by changing some style elements in the source code container. To make it look like a book, the source code is actually cloned to appear in two elements, with the other (animated one) showing the left side and the other showing the right side. There’s negative margins, absolute positioning, clipping (overflow: none), and so on. You can use Firebug or built-in browser inspector to examine the elements and CSS.

Thank you for the tips, i will use firebug as you suggest it to get more details about the used CSS