JSFiddle - React, Tailwind, and code Playground

HTML

<table class="tb" contenteditable="true">
    <tr>
        <td>Valor 1</td>
        <td>Valor 2</td>
    </tr>
    <tr>
        <td>Valor 3</td>
        <td>Valor 4</td>
    </tr>
</table>
<button id="reler">re-ler</button>

CSS

<table class="tb"> <tr><td>Valor 1</td><td>Valor 2</td></tr> <tr><td>Valor 3</td><td>Valor 4</td></tr> </table>

JavaScript

document.getElementById('reler').onclick = function () {
    var html = document.body.innerHTML;
    alert(html);
}