/* Closures and Scoping */

!function(window) {
  var body = window.getElementsByTagName('body')[0];

  console.log(body);
}(document);

/*
Q: What would you expect the value of body to be?

A: Body will be the actual body. Although getElementsByTagName is not a valid window
   document, we have changed the value of window to be document based on the closure.
*/