应用程序在左侧有默认的导航侧栏，在顶部有菜单和标头。
The application has a default navigation sidebar on the left and a menu and header on the top.
浏览器加载页逐步标头，该徽标，在该的顶部栏导航时等所有作为为正在等待页的用户的视觉反馈。
When the browser loads the page progressively the header, the navigation bar, the logo at the top, etc. all serve as visual feedback for the user who is waiting for the page.
还会注意到，搭建非常原始：它没有图片、没有 Ajax、没有公共标头或侧栏，也没有任何现代 Web 页面中常见的修饰。
You'll also notice that the scaffolding is very primitive: it has no graphics, no Ajax, no common headers or sidebars, and none of the embellishments you've come to expect from modern Web pages.
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