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