JSFiddle - React, Tailwind, and code Playground

HTML

<div id="block" style="border: 5px solid black; text-align: right; moo">test</div>

JavaScript

var obj = document.getElementById('block');

alert(getStyleStr(obj));

function getStyleStr(node) {
    return typeof(node.getAttribute('style')) !== 'string' ? node.style.cssText : node.getAttribute('style');
}