anchor.diff:    p.
       Add the following code to the bottom of <code>web/main.dart</code>:
   
  -  pre.prettyprint
  -    code.
  -      main() {
  -        // Temporarily needed.
  -        reflector.reflectionCapabilities = new ReflectionCapabilities();
  -
  -        bootstrap(AppComponent);
  -      }
  -
  -  // [PENDING: add line numbers once we can specify where they start]
  +  code-example(language="dart" format="linenums:15").
  +    main() {
  +      reflector.reflectionCapabilities = new ReflectionCapabilities();
  +      bootstrap(AppComponent);
  +    }
   
     p.
       This code adds a <code>main()</code> function
  
positive.code:   h2#section-angular-run-app 6. Build and run your app
  
    p.
      You have several options for running your app.
      The quickest and easiest, for now,
      is to open your project in <b>Dart Editor</b>,
      right-click <b>web/index.html</b>,
      and choose <b>Open in Dartium</b>.
      This starts a web server
      and opens your app in an experimental browser that contains the Dart VM.
  
    // TODO: screenshot? embedded app?
  
    p.
      Another option is to build and serve the app using <code>pub serve</code>,
      and then run it by visiting <b>http://localhost:8080</b> in a browser.
      Generating the JavaScript takes a few seconds when you first visit the page,
      and the generated JavaScript is currently large.
      The generated JavaScript will be smaller once
      Angular's transformer becomes available.
  
    // [PENDING: Update when transformer is working!]
  
  // WHAT'S NEXT... ##########################
  .l-main-section
    h2#section-transpile Great job! Next step...
  
    p.
      We plan to add a developer guide soon.
      Until then, check out <a href="resources.html">Angular Resources</a>.
      To learn more about Dart, go to
      <a href="https://www.dartlang.org">dartlang.org</a>.
  
negative.code:     The argument to <code>bootstrap()</code> is the name of the component class
      you defined above.
  
    //- Explain why setting reflector.reflectionCapabilities is necessary.
  
  
  // STEP 5 - Declare the HTML ##########################
  