JSFiddle - React, Tailwind, and code Playground

HTML

<table>
        <tr>
            <td class="numeric">0</td>
            <td class="numeric">2</td>
            <td class="numeric">3</td>
            <td class="numeric">1</td>
            <td class="numeric">4</td>
            <td class="numeric">5</td>
            <td class="numeric">0</td>
            <td class="numeric">2</td>
            <td class="numeric">3</td>
            <td class="numeric">1</td>
            <td class="numeric">10</td>
            <td class="numeric">5</td>
        </tr>
    </table>

<div id="result"></div>

JavaScript

var items = document.getElementsByClassName('numeric');

var total = 0;

for (i = 0; i < items.length; i++) {
    var num = parseInt(items[i].innerHTML, 10) || 0;
    total += num;   
}

document.getElementById('result').innerHTML = total;