docs: public void setOutputStyle(final String outputStyle) {
          if (outputStyle == null && this.outputStyle == null) {
              return;
          } else if (outputStyle == null) {
              removeChild(this.outputStyle);
              this.outputStyle = null;
          } else if (this.outputStyle == null) {
              this.outputStyle = new KeyValueNode<String>(CSConstants.OUTPUT_STYLE_TITLE, outputStyle);
              appendChild(this.outputStyle, false);
          } else {
              this.outputStyle.setValue(outputStyle);
          }
      }