原始元素：外观及观感，概念，数据
这意味着文档顺序以及包含空格的原始元素内容将被保留。
This means that the document order is preserved as well as the original element content with whitespace.
将原始元素拷贝到一个脱离文档的节点中，修改副本，然后覆盖原始元素。
Copy the original element into an off-document node, modify the copy, and then replace the original element once you're done.
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