docs: function initialize ( target, originalOptions ) {
  
          if ( !target.nodeName ) {
              throw new Error('noUiSlider.create requires a single element.');
          }
  
          if (originalOptions.tooltips === undefined) {
              originalOptions.tooltips = true;
          }
  
          // Test the options and create the slider environment;
          var options = testOptions( originalOptions, target );
          var api = closure( target, options, originalOptions );
  
          target.noUiSlider = api;
  
          return api;
      }