JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test_unstyled"></div>
<div id="test_styled" style="background-color: red;" class="something"></div>

JavaScript

var unstyled = document.getElementById('test_unstyled'),
    styled = document.getElementById('test_styled');

console.log('test_unstyled is styled?', !!(unstyled.getAttribute('style') || unstyled.className));
console.log('test_styled is styled?', !!(styled.getAttribute('style') || styled.className));