Why some jsfiddle examples work without having external url

I have noticed that on some jsfiddle.net examples there are no external links, but it still works.

But when I create my jsfiddle sample it won't work without external url packages.

For example jsfiddle.net/afm7rhsw/ link has angularjs working on it, but there is no any external package to it.

Couldn't figure out, please help.

Thanks

Solution

You can select common libraries to use with your fiddle via the drop down in the JavaScript section. See attached image for reference.