code: function() {
          if(!DT._elColumnDragTarget) {
              // Attach Column drag target element as first child of body
              var elColumnDragTarget = document.createElement('div');
              elColumnDragTarget.className = DT.CLASS_COLTARGET;
              elColumnDragTarget.style.display = "none";
              document.body.insertBefore(elColumnDragTarget, document.body.firstChild);
  
              // Internal tracker of Column drag target
              DT._elColumnDragTarget = elColumnDragTarget;
              
          }
          return DT._elColumnDragTarget;
      }
docs: Creates HTML markup for shared Column drag target.
  
  @method DataTable._initColumnDragTargetEl
  @return {HTMLElement} Reference to Column drag target.
  @private
  @static