Range: insertNode() method

The Range.insertNode() method inserts a node at the start of the Range.

The new node is inserted at the start boundary point of the Range. If the new node is to be added to a text Node, that Node is split at the insertion point, and the insertion occurs between the two text nodes.

If the new node is a document fragment, the children of the document fragment are inserted instead.

insertNode(newNode)

range = document.createRange();
newNode = document.createElement("p");
newNode.appendChild(document.createTextNode("New Node Inserted Here"));
range.selectNode(document.getElementsByTagName("div").item(0));
range.insertNode(newNode);