anchor.diff:  
     There are limitations. For example, you cannot make an XHR call from within a `fakeAsync`.
   
  -a#tick
  -a#tick-first-look
  +#tick
  +#tick-first-look
   :marked
     ## The _tick_ function
     Compare the third and fourth tests. Notice that `fixture.whenStable` is gone, replaced by `tick()`.
  
positive.code: 
  .l-hr
  
  a#routed-component
  :marked
    # Test a routed component
  
  
negative.code: a(href="#top").to-top Back to top
  
  .l-hr
  #atp-intro
  :marked
    # The Angular Testing Platform (ATP)
  
  