Add a child to the child list. NOTE: This presumes the child did not previously have a parent. Making that assumption makes this a less expensive operation -- but requires that if you *do* want to reparent a node, you use removeChild() first to remove it from its previous context. Failing to do so will damage the tree.
@param newChild Child to be added to child list
@return Child just added to the child list
@throws DOMException
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