JSFiddle - React, Tailwind, and code Playground

HTML

<div id="feed_stream">
</div>

JavaScript

// Find all posts

var node = document.getElementById("feed_stream");
var posts = node.getElementsByClassName("userContentWrapper");
var post, text;
console.log(posts);
console.log(posts.length);

node.innerHTML += 
    '<div class="userContentWrappe">content 1</div>' +
    '<div class="userContentWrapper">content 2</div>' +
    '<div class="userContentWrapper">content 3</div>' +
    '<div class="userContentWrapper">content 4</div>';

console.log(posts);
console.log(posts.length);