在HTTP请求过程中，该对象会从浏览器或客户端设备中获取信息，以便让您的应用程序知道浏览器或客户端设备提供的支持类型和级别。
This object gets information from the browser or client device during an HTTP request, telling your application the type and level of support the browser or client device offers.
最新的浏览器提供两种功能：以可见或交互的方式对UI在客户端的行为进行更多控制；以更干净和更具可扩展性的方式来实现这些控制。
The latest browsers afford you two things: more control over how the UI behaves on the client side (both visually and interactively) as well as cleaner, more extensible ways to implement it.
客户端访问可能受黑客运作的站点，其中的图片链接或其他激活的HTML强迫浏览器访问该链接。
The client visits a site, perhaps operated by the attacker, where a link to an image or otherwise-active HTML forces the browser to access the link.
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