anchor.diff:  
   @View(template: '''
   <p>Clock: <i>{{ counter }}</i></p>
  -<p>Start at: 
  +<p>Break duration: <i>{{ durationBreak }}</i></p>
  +<p>Duration of pomodoro: 
   <input #userstartat>
  -<button (click)="setStartTime(userstartat.value)">set time</button>
  +<button (click)="setStartTime(userstartat.value)">set</button>
  +</p>
  +<p>Duration of break: 
  +<input #durationbreak>
  +<button (click)="setDurationBreak(durationbreak.value)">set</button>
   </p>
   <button (click)="start()">Start</button>
   <button (click)="stop()">Stop</button>
  
positive.code:   }
  
    void setStartTime(string at){
      print(at);
      var value = int.parse(at, onError: (source) => null);
      if (value != null){
        startAt = value*60;
      }
    }
  
  }
negative.code: ''')
  
  class Clock{
  
    int startAt;
    String durationBreak;
    String counter;
    Stopwatch watch = new Stopwatch();
    Timer timer;
  
    Clock(){
      startAt = (25*60);
      durationBreak = prettyPrintTime(5);
      counter= prettyPrintTime(25);
    }
    
    void start() {
      watch.start();
  