Function getLeafNode

docs/lib/react.js:16873–16878

* Given any node return the first leaf node without children. * * @param {DOMElement|DOMTextNode} node * @return {DOMElement|DOMTextNode}

(node)

 */

function getLeafNode(node) {
  while (node && node.firstChild) {
    node = node.firstChild;
  }
  return node;
}

/**
 * Get the next sibling within a container. This will walk up the