docs: function () {
  
              var iframe, document = Aria.$window.document;
  
              iframe = document.createElement('iframe');
  
              iframe.setAttribute('id', this.IFRAME_ID);
              iframe.style.display = 'none';
  
              document.body.appendChild(iframe);
  
              this._iframe = iframe;
              this.polledIframeHashString = this._currentHashString;
  
              this._addIframeHistoryEntry(this._currentHashString);
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