Why Google search client side code is soo big?

I Just prees ctrl+shift+I took look at googel client side code and i was stunned. The Code has total 8824 line(after applying Pretty Printing). Screenshot

Google front end inculde a textbox,a search button,Google's icon, an app dropdown and some more links like Privacy, Terms etc.

Adding all these wouldn't make 8824 lines(as far as my experiece),even if add some hidden technology like Ajax to sync search prediction, handeling Account Log-in details etc.

Than what does all other code do?