JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div id="a"><div id="b">b</div></div>
    <div id="c"><div id="d">d</div></div>
    <p></p>
</div>

JavaScript

var result ='';
result += "'#container > *:eq(1)' returns: " + $("#container > *:eq(1)").attr('id');
result +="<br>";
result += "'#container > * :eq(1)' returns: " + $("#container > * :eq(1)").attr('id');
$('p').html(result);