JSFiddle - React, Tailwind, and code Playground

HTML

<div id="sample" yteketet> test</div>

CSS

#sample{
    width: 10px;
    height: 10px;

    foo: bar;

    background: invalidText;
}

JavaScript

var element = document.getElementById('sample');

console.log(element.style.foo);
console.log(window.getComputedStyle(element, null).foo);

console.log(element.style.background);
console.log(window.getComputedStyle(element, null).background);