anchor.diff:    We can define our own strategy the same way the **PreloadAllModules** modules strategy was provided to our *RouterModule.forRoot* configuration object.
   
     Since we want to take advantage of this, we'll add a custom strategy that _only_ preloads the modules we select. We'll enable the preloading by using the *Route Data*,
  -  which we learned is an object to store arbitrary route data and and [resolve data](#resolve-guard).
  -
  -  We'll add a custom `preload` boolean to our `crisis-center` route data that we'll use with our custom strategy. To see it in action, we'll add to
  +  which, as we learned, is an object to store arbitrary route data and and [resolve data](#resolve-guard).
  +
  +  We'll add a custom `preload` boolean to our `crisis-center` route data that we'll use with our custom strategy. To see it in action, we'll add 
     the `route.path` to the `preloadedModules` array in our custom strategy service. We'll also log a message
     to the console for the preloaded module.
   
  
positive.code:   We've learned how to load modules on-demand, but we can also take advantage of loading feature areas modules in *advance*. The *Router*
    supports **pre-loading** of asynchronous feature areas prior to navigation to their respective URL. Pre-loading allows us to to load our initial route
    quickly, while other feature modules are loaded in the background. Once we navigate to those areas, they will have already been loaded
    as if our they were included in our initial bundle.
  
    Each time a **successful** navigation happens, the *Router* will look through our configuration for lazy loaded feature areas
    and react based on the provided strategy.
  
negative.code:   The *Router* also supports [custom preloading strategies](#custom-preloading) to give us control of what we want to pre-load.
  
    We'll update our *CrisisCenterModule* to be loaded lazily by default and use the `PreloadAllModules` strategy to eagerly
    it up.
  
  <a id="preload-canload"></a>
  .l-sub-section
  