JSFiddle - React, Tailwind, and code Playground

HTML

<a class="video">video</a>
<a class="novideo">no video</a>
<a class="video">video</a>
<span class="video">span video</span>

JavaScript

function get(selector) {
    return document.querySelectorAll(selector)
}

(function() {
    var video = get('a.video');
    console.log(video);
    for (var i = 0; i < video.length; i++) {
        video[i].style.color = 'red'
    }
}())