JSFiddle - React, Tailwind, and code Playground

by Dan Daniel

HTML

<div class="div1"></div>
<div class="div1"></div>
<div class="div2"></div>
<div class="div1"></div>
<button onclick="runTest()">Run!</button>

CSS

div {width:100px;height:10px;border:2px solid #CCC;}

JavaScript

function runTest() {
    b = document.getElementsByClassName('div1');
    for (i = 0; i < b.length; i++) {
        b[i].style.backgroundColor = "red";
    }
}