将文件放置在Web服务器之前进行脱机测试时，这项特性可能非常有用。
This feature can be useful for offline testing before putting the files on the Web server.
其第三个逻辑值(中间逻辑值)用作故障指示信号，或在脱机测试时应用。
The third logic value (the middle value) can be used as a fault indicating signal, or in off-line testing.
利用您收集的屏幕截图，您可以脱机操作缺省呈现集，直到您准备再次通过与主机的连接进行测试为止。
With your collection of screen captures, you can work on the default rendering set offline until you are ready to test again with a live connection to the host.
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