JSFiddle - React, Tailwind, and code Playground

HTML

<div id="body">
  <table id="context">
    <tr>
      <td class="td0"><a>target0</a></td>
      <td class="td1"><a>target1</a></td>
      <td class="td1"><a>target1+</a></td>
    </tr>
  </table>
  <table id="non-context">
    <tr>
      <td class="td1"><a>target2</a></td>
    </tr>
  </table>
</div>

JavaScript

var context = $('#context');
var selector = 'table tr .td1 a';
//var result = $(context).find(selector).addBack(selector);

//console.log(result);

var s = $(selector);
//console.log('s:', s);
var res = $(context).find(s).addBack();
console.log( res );