When a user clicks on a closed node, the onClick event of the target node is bubbled up by the browser to the main onClick handler of the widget's controller code.

当用户单击某个关闭的节点时，浏览器会将目标节点的onClick事件(通过气泡)传递给小组件控制器代码的主onclick处理程序。

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Every time a tag is opened or closed, or any time the parser sees some text, it makes callbacks to some user-defined functions with the node or text information.

每次打开或关闭一个标记时，或者每次解析器看到文本时，就用节点或文本的信息回调用户定义的函数。

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The solution ElementTree adopts is to give each node a .tail attribute, which contains all the text after a closing tag but before the next element begins or the parent element is closed. For example

ElementTree 采用的解决方案赋予了每个节点一个 .tail 属性，它包含了位于结束标记之后，下一元素开始或父元素结束之前所有的文本。

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