Modularizing web applications

Question

I was wondering how big companies tend to modularize components on their page. Facebook is a good example:

There\'s a team working on Search that has it

Answer 1

Some applications use a portal server which is used as a proxy. It sits in front of all these web/application servers. The portal server gets the data/feeds of HTML these servers and then adds a prefix/suffix to the tags making them unique.

In a way you are correct, there is a component which handles such things.