clone method Null safety

Implementation

@JSName('cloneNode')
/**
 * Returns a copy of this node.
 *
 * If [deep] is `true`, then all of this node's children and descendents are
 * copied as well. If [deep] is `false`, then only this node is copied.
 *
 * ## Other resources
 *
 * * [Node.cloneNode](https://developer.mozilla.org/en-US/docs/Web/API/Node.cloneNode)
 *   from MDN.
 */
Node clone(bool? deep) native;