code: function createNode(nodeName, isSvg) {
      var node = isSvg ? document.createElementNS('http://www.w3.org/2000/svg', nodeName) : document.createElement(nodeName);
      node.normalizedNodeName = nodeName;
      return node;
    }
docs: Create an element with the given nodeName.
  @param {String} nodeName
  @param {Boolean} [isSvg=false]	If `true`, creates an element within the SVG namespace.
  @return {Element} node