JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td> hidden </td>
        <td> hidden </td>
    </tr>
    <tr>
        <td class="shown"> shown </td>
        <td> hidden </td>
    </tr>
    <tr>
        <td> hidden </td>
        <td> hidden </td>
    </tr>
</table>

JavaScript

var tds = document.getElementsByTagName("td");

for ( var i = 0, size = tds.length; i < size; i++ ) {
    if (  !hasClass( tds[i], "shown" ) ) {
        tds[i].style.display = "none";
    }
}

function hasClass(element, cls) {
    return (' ' + element.className + ' ').indexOf(' ' + cls + ' ') > -1;
}