JSFiddle - React, Tailwind, and code Playground

by MrTest

HTML

<table>
    <tr>
         <td>&nbsp;+&nbsp;</td>
         <td> 1 </td>
         <td> 3 </td>
         <td> 6 </td>
         <td> 7 </td>
    </tr>
</table>

CSS

.url { background-color: #ccc;}
table { width: 80%; margin: 10px auto;}
table td {border: 1px solid #ccc; text-align: center;}

JavaScript

$('table tr td:contains(" + ")').each( function(){
        $(this).addClass('url');
});