onerror property
      
      EventHandlerNonNull<Event> ?
      get
      onerror
      
    
    
    
Implementation
EventHandlerNonNull? get onerror => js_util.getProperty(this, 'onerror');
      
      set
      onerror
      (EventHandlerNonNull<Event> ? newValue) 
      
    
    
    
Implementation
set onerror(EventHandlerNonNull? newValue) {
  js_util.setProperty(this, 'onerror', newValue);
}