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Swap two nodes

The function below swaps two given nodes, nodeA and nodeB:

const swap = function(nodeA, nodeB) {
    const parentA = nodeA.parentNode;
    const siblingA = nodeA.nextSibling === nodeB ? nodeA : nodeA.nextSibling;

    // Move `nodeA` to before the `nodeB`
    nodeB.parentNode.insertBefore(nodeA, nodeB);

    // Move `nodeB` to before the sibling of `nodeA`
    parentA.insertBefore(nodeB, siblingA);
};

Might be useful