code: function(e) {
        var current = this.getFragment();
        if (current === this.fragment && this.iframe) {
          current = this.getFragment(this.getHash(this.iframe));
        }
        if (current === this.fragment) return false;
        if (this.iframe) this.navigate(current);
        this.loadUrl();
      }
docs: Checks the current URL to see if it has changed, and if it has, calls `loadUrl`, normalizing across the hidden iframe.