JSFiddle - React, Tailwind, and code Playground

HTML

<div id="hero">
    <div></div>
</div>

CSS

#hero{
    background-color: #f00;
    width: 20px;
    height: 20px;
}

JavaScript

var a=4;
var b=0;

for(a=0;a<10;a++)
{
    b=b+1;
}
console.log("------------");
console.log("de waarde van b = "+ b);