Without looking at the source, I would say it is using the History API introduced in HTML5. Here is a nice article describing it: http://diveintohtml5.info/his

Without looking at the source, I would say it is using the History API introduced in HTML5. Here is a nice article describing it: http://diveintohtml5.info/history.html http://diveintohtml5.info/history.html A simple example with source can be found here: http://html5demos.com/history http://html5demos.com/history