If you're also loading other sites, you'll see a list of them: scroll until you find the YouTube page and click on the arrow to show details about what is being loaded.
如果你也打开了其他的网页，你就会看到所有加载网页的列表：拖动滚动条直到找到YouTube网页，单击箭头以查看当前加载项的详细信息。
Gets a value indicating whether the page is being loaded in response to a client postback, or if it is being loaded and accessed for the first time.
中文意思就是说获取一个值，该值指示该页是否正为响应客户端回发而加载，或者它是否正被首次加载和访问。
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