tinymce.full.js
function () {
        var self = this;

        if (self[0] && self[0].parentNode) {
          return domManipulate(self, arguments, function (node) {
            this.parentNode.insertBefore(node, this);
          });
        }

        return self;
      }
function () {
        var self = this;

        if (self[0] && self[0].parentNode) {
          return domManipulate(self, arguments, function (node) {
            this.parentNode.insertBefore(node, this);
          });
        }

        return self;
      }
function ( ) { var self = this ; if ( self [ 0 ] && self [ 0 ] . parentNode ) { return domManipulate ( self , arguments , function ( node ) { this . parentNode . insertBefore ( node , this ) ; } ) ; } return self ; }
Adds the specified elements before current set nodes.

@method before
@param {String/Element/Array/tinymce.dom.DomQuery} content Content to add before to each element in set.
@return {tinymce.dom.DomQuery} Current set.
Adds the specified elements before current set nodes .