    </tr>
  </thead>
  <tbody>
    <tr>
      <td>0</td>
      <td>example</td>
    </tr>
  </tbody>
</table>
  <script>
    function slowInsert() {
      let tbody = document.querySelector('tbody');
      let startTime = new Date().getTime();
      for (let i =0;i<10;i++){
        let row = document.createElement('tr');
        let id = document.createElement('td');
        id.innerText = i;
        let val = document.createElement('td');
        val.innerText = 'Value #'+i;
        row.appendChild(id);
  