AddElem elements in the current position or after the last one brother a new element,
InsertElem elements in the current position or the first brother before inserting an element,
Invoke the behind of the current node, or the parent element content at the end of a new node,
InsertNode in front of the current node, or the parent element content at the beginning of a new node,
, pay attention to distinguish between the elements and nodes, element is just a special kind of node,)
Now add element is not in the final is on top, how to add in the current position before or after,
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