_contentTemplate() {
    if (this.selectedElement) {
      const labelNodes = Array.from(this.selectedElement.childNodes);
      if (labelNodes.length > 0) {
        return labelNodes.map(node => node.cloneNode(true));
      }
      return this.selectedElement.textContent;
    }
    return this._noSelectionTemplate();
  }
@protected
@returns {TemplateResult|Node[]|string|null}