We proxy the jquery object. This lets us use the jQuery that FCC uses in the iframe. Since jQuery sets the context, the main document object or DOM, at script load, we need to create a proxy with the context of the iframe, the document object of the iframe. This was originally set to the body element. But not all challenges require a body element.
This is the entry point for the client code Code that should only run on the client should be put here.
NOTE(berks): For react specific stuff this should be the entry point