anchor.diff:  The example library includes a single [classname]#MyComponent# component,
   defined in [filename]#mylibrary.js#.
   
  -
  +[source,javascript]
   ----
   // Define the namespace
   var mylibrary = mylibrary || {};
  
positive.code: When used in an HTML page, the library would be included with the following
  definition:
  
  
  ----
  <script type="text/javascript"
          src="mylibrary.js"></script>
  
negative.code: A JavaScript component extends the [classname]#AbstractJavaScriptComponent#,
  which handles the shared state and RPC for the component.
  
  [source,java]
  ----
  package com.vaadin.book.examples.client.js;
  
  