It matches any single element in the document tree.
它匹配在文档树中的任意一个元素。
As Figure 5 illustrates, taken together, the events describe the document tree to the application.
如图5所示，这些事件共同向应用程序描述了文档树。
As Figure 5 illustrates, taken together, the events describe the document tree to the application.
如图5所示，这些事件共同向应用程序描述了文档树。
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