[pnevares]

You were misled by the slide image interrupting the flow of the text:

So, I build this JavaScript framework at Google. It is used by Photos, Sites, Plus, Drive, Play, the search engine, all these sites. Some of them are pretty large, you might have used a few of them.

[Slide]

This Javascript framework is not open source.

[randiantech]

Oh, thanks for the clarification.

[anonytrary]

I found it a tad bit confusing as well, thanks for asking.