The Gmail frontend is written in javascript using the closure library. http://code.google.com/closure/ http://code.google.com/closure/ You can look at the (co

The Gmail frontend is written in javascript using the closure library. http://code.google.com/closure/ http://code.google.com/closure/ You can look at the (compiled version) of the code by looking at the scripts tab of the chrome web inspecter. They're there :)