CallsMoveToContent and tests if the current content node is a start tag or empty element tag.

测试当前内容节点是否是开始标记。

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Remember, the DOM will create well-formed HTML, meaning that the element is currently empty, with both a starting and ending tag.

要记住，DOM会创建结构良好的HTML，就是说这个目前为空的元素包括起始和结束标签。

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Moreover, an element that has no content is represented by an empty child list, but a self-closed tag is represented by None. Listing 2 shows this structure in action.

而一个没有内容的元素由一个空的子列表表示，但是一个自封闭的标记由None表示。

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