在执行此操作的同时，挑选窗体背景。

In doing so, pick the background for your form.

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默认情况下，如果窗体不包含操作属性，浏览器将会回发。

Browsers, by default, will postback if the form doesn't contain an action attribute.

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当启动待测试应用程序后，我模拟用户操作应用程序窗体。

After I've launched the application under test, I simulate a user manipulating the application form.

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