JSFiddle - React, Tailwind, and code Playground

HTML

<table id="table1">
  <tr>
    <td>CPF</td>
    <td>12345678900</td>
  </tr>
  <tr>
    <td>CPF</td>
    <td>12345678900</td>
  </tr>
</table>

JavaScript

function formatarCPF()
{
  var table = document.getElementById("table1");
  var td = table.getElementsByTagName("td");
  for(var i = 0; i < td.length; i++)
  {
    console.log(td[i].innerText);
    if (td[i].innerText != "CPF")
    {
        td[i].textContent = 
        	td[i].textContent.replace(/(\d{3})(\d{3})(\d{3})(\d{2})/g,"\$1.\$2.\$3\-\$4");
    }
  }
}

formatarCPF();