JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://code.jquery.com/jquery-2.1.0-rc1.js"></script>
<!-- Removing this element fixes it -->
<div></div>

<span id="target">
    <div></div>
</span>

JavaScript

var target = $( "#target" );
var div = $( "div" );

// This set contains 2 elements as expected
console.log( "Expected", 2, "Result", div.length );

// This finds 1 element as expected
console.log( "Expected", 1, "Result", target.find( "div" ).length );

// Expected this set to contain 1 element, but it contains 0
console.log( "Expected", 1, "Result", target.find( div ).length );