This method is like _.clone except that it accepts customizer which is invoked to produce the cloned value. If customizer returns undefined cloning is handled by the method instead. The customizer is invoked with up to five arguments; (value [, index|key, object, stack]).

function customizer(value) {
  if (_.isElement(value)) {
    return value.cloneNode(false);
  }
}

var el = _.clone(document.body, customizer);

console.log(el === document.body);
// => false
console.log(el.nodeName);
// => BODY
console.log(el.childNodes.length);
// => 0