Creating multiple child element after editing using RTE

*         <option>4</option>
     *         <option>7</option>
     *       </select>`,
     *     // Bind the 'result' on 'change' listener
     *   event: 'change',
     *   result: (rte, action) => rte.exec('fontSize', action.btn.firstChild.value),
     *   // Callback on any input change (mousedown, keydown, etc..)
     *   update: (rte, action) => {
     *     const value = rte.doc.queryCommandValue(action.name);
     *     if (value != 'false') { // value is a string
     *       action.btn.firstChild.value = value;
     *     }
     *    }
     *   })

this block of code is only supporting font size values between 1 to 7 although is should be generic and should be support all integer values