ScrollSpy works only on the body tag?

Created by: onethread

I've got an example here: http://jsfiddle.net/03sv47av/

As is, scrollspy will set up, but will not react to scrolling. But if you cut all the attributes from the first div and paste them to the body tag and re-run the example, scrollspy works perfectly.

You'll need to inspect the nav elements with your browser dev tools. When it works, the active classes will be dynamically applied as you scroll.

I've reread the docs about a zillion times now, and I can't seem to pinpoint where I'm going wrong.