anchor.diff:    .content
       h1 IIFEs in the wild: jQuery Plugins
       p
  -      | Seal your code in a new scope, alias the global
  +      | Seal your code in a new scope, alias the global 
         em jQuery
  -      | function as
  +      |  function as 
         em $
         | :
       pre.
  
positive.code:     h1 Create private variables
      p
        | The revealing module pattern (
        em 'num'
        | is private):
      pre.
        var number = (function(){
  
negative.code:     h1 Why pass 'i' to the for-loop IIFE?
      p
        | Javascript has lexical (function) scope, so
        em i 
        | is shared by all functions created in this loop.
      p
        | The IIFE locks in
        em i 
        | 's value, otherwise we get this:
      pre.
          for (var i = 1; i <= 3; i++) {  
  