    textarea.focus();
                            textarea.selectionStart = end + 2;
                            break;
                        case 'strike':
                            textarea.setRangeText(`~~${currentValue.slice(start, end)}~~`, start, end);
                            textarea.focus();
                            textarea.selectionStart = end + 4;
                            break;
                        default:
                            break;
                    }
        
      