举例来说，你需要在主页面的页眉添加链接，以链接到外部资源。
For example, you need to add some links to external resources to the main web page header.
当浏览器逐渐加载页面时，页眉，导航栏，顶部的标志等都用作对等待页面的用户的视觉反馈。
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.
当浏览器逐渐加载页面时，页眉，导航栏，顶部的标志等都用作对等待页面的用户的视觉反馈。
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.
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