为调用应用程序提供了特定于应用程序的信息，比如状态码和出错页面。
Application-specific information, like status codes and error pages, are provided for the calling application.
为了支持书签和直接定向功能，我们建议每个URL都包含导航状态信息，至少包括所请求页面上的所有Portlet的全部呈现参数。
To enable bookmarking and direct address, we recommend that each URL contain the navigational state information, including all render parameters of all portlets on (at least) the requested page.
WAI - ARIA充当AT和Web用户界面之间的协议，这为Web页面用户界面带来了更加丰富的信息，比如角色和状态。
WAI-ARIA ACTS like a contract between the ATs and the Web user interface, which brings more rich information such as roles and states to the Web page user interface.
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