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The user interface consists of a “Start” page, index.html, that allows us to navigate to data management UI pages, one for each object type. In our example, this includes books.html and publishers.html. Each of these data management UI pages contains five sections. There’s a “Manage” section with a menu for choosing a CRUD use case. There’s also a section for each CRUD use case, like “Retrieve” all books, “Create” book, “Update” book, and “Delete” book. Only one of them is displayed at any time if the CSS property display:none is ...