JSFiddle - React, Tailwind, and code Playground

by Karl Hui

HTML

<h1>This is a simple header</h1>

CSS

h1{
    font-size:15px;
    color:#00f;
    text-decoration:underline;
    -webkit-transition-duration:0.2s;
}

JavaScript

function add(a, b) {
    return a + b;
}

function yellAtMe(thingtoyell) {
    return "The thing you've said is: " + thingtoyell +
        " This is what is looks like if you yell: " + 
        thingtoyell.toUpperCase();
}

document.querySelector("h1").textContent = (yellAtMe("fooooo"));