duration property
      
      dynamic
      get
      duration
      
    
    
    
Implementation
/* double | NaN */ dynamic get duration =>
      js_util.getProperty(this, 'duration');
      
      set
      duration
      (dynamic newValue) 
      
    
    
    
Implementation
set duration(/* double | NaN */ dynamic newValue) {
  js_util.setProperty(this, 'duration', newValue);
}