text: define(function(require) {
  
      var BaseDomHelper = require('acceptance/helper/dom/base-dom-helper');
  
      var PreviewDomHelper = BaseDomHelper.extend({
  
          $preview_js: '#pdfjs-viewer',
  
          $preview_embedded: 'embed[type="application/pdf"]'
      });
  
      return PreviewDomHelper;
  });