The cloneNode() method of the Node interface returns a duplicate of the node on which this method was called. Its parameter controls if the subtree contained in a node is also cloned or not.

Cloning a node copies all of its attributes and their values, including intrinsic (inline) listeners. It does not copy event listeners added using addEventListener() or those assigned to element properties (e.g., node.onclick = someFunction). Additionally, for a <canvas> element, the painted image is not copied.

To clone a node to insert into a different document, use Document.importNode() instead.

deep Optional

If true, then the node and its whole subtree, including text that may be in child Text nodes, is also copied.

If false, only the node will be cloned. The subtree, including any text that the node contains, is not cloned.

Note that deep has no effect on void elements, such as the <img> and <input> elements.

The new Node cloned. The cloned node has no parent and is not part of the document, until it is added to another node that is part of the document, using Node.appendChild() or a similar method.