JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container" id="0">
  <div id="1">
    <div class="container" id="2">
      <div>
        <div class="container" id="3"></div>
      </div>
    </div>
    <div id="4">
      <div class="container" id="5"></div>
    </div>
  </div>
</div>

JavaScript

$items = $('#0').find('.container').filter(function(index) {
    return !$(this).parents(':not(#0)').hasClass('container');
});

$items.each(function(ind, el) {
    alert(this.id);
});