JSFiddle - React, Tailwind, and code Playground

HTML

<div id="theDiv" style="background-color: red; text-align: center;height: 20px; width: 20px;">
    
</div>

JavaScript

var theDiv = document.getElementById("theDiv");

alert(theDiv.style["background-color"]);
alert(theDiv.style["backgroundColor"]);
alert(theDiv.style["text-align"]);
alert(theDiv.style["textAlign"]);

var obj = {};
obj['a-b'] = 2;
alert(obj.aB);
alert(obj['a-b']);