用户浏览网页时，首先观察网页的左上部和上层部分，之后再往下阅读，浏览右边的内容。
Users initially look at the top left and upper portion of the page before moving down and to the right.
取得最上层的要求这个网页效能测试中最后一个接收到的回应。
Gets the last response that was received for a top-level request in this Web performance test.
取得最上层的要求这个网页效能测试中最后一个接收到的回应。
Gets the last response that was received for a top-level request in this Web performance test.
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