anchor.diff:  
           .small-code
             :html
  -            <script src="http://promisejs.org/polyfills/promise-done-1.0.0.js"></script>
  +            <script src="https://www.promisejs.org/polyfills/promise-done-1.0.0.js"></script>
       h2#then Transformation / Chaining
   
       p.
  
positive.code:       The good news is that they're extremely easy to polyfill (#[a(href="/polyfills/promise-" + versions.promise + ".js") link]):
      .small-code(href="/polyfills/promise-" + versions.promise + ".js")
        :html
          <script src="http://promisejs.org/polyfills/promise-#{versions.promise}.js"></script>
      
      p.
        None of the browsers currently support #[code Promise.prototype.done]
  
negative.code: 
      .small-code
        :html
          <script src="https://www.promisejs.org/polyfills/promise-done-1.0.0.js"></script>
  
      h3 Node.js
      
  