JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    Something that should be interesting
    <div class="black">
        Some other thing that should be interesting
    </div>
</div>

CSS

div#container {
    color:#fff;
    line-height:5em;
}

JavaScript

var $black = $('div.black:eq(0)');
alert($('<div>').attr('class', $black.attr('class')).css('line-height') === $black.css('line-height'));