In traditional web applications, all the page changes are associated with a full-page reload, which fetches all of the referenced resources and data and renders the entire page onto the screen. However, requirements for web applications have evolved over time.

Single-page applications (SPAs) that we build with Angular simulate desktop user experiences. This often involves incremental loading of the resources and data required by the application, and no full-page reloads after the initial page load. Often, the different pages or views in SPAs are represented by different templates, which are loaded asynchronously and rendered on a specific position on the screen. Later, when the template with all the required resources is loaded and the route is changed, the logic attached to the selected page is invoked and populates the template with data. If the user clicks on...