JSFiddle - React, Tailwind, and code Playground

HTML

<div id="hiddenSecrets">
    <p id="valueOne"></p>
    <p id="valueTwo"></p>
</div>

CSS

#valueOne:after {
    content: "2048";
}

JavaScript

var str = window.getComputedStyle($('#valueOne')[0], ':after').getPropertyValue('content');
alert(str);
$('#hiddenSecrets').hide();