JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<OL>
<LI id="firstLI">Thing One</LI>
<LI id="secondLI">Thing Two</LI>
</OL>

CSS

OL {
    list-style-type: decimal;
}

JavaScript

function setStyle(oElement, sKey, sValue) {
    oElement.style.cssText += ('; ' + sKey + ': ' + sValue + ';');
}

var LI = document.getElementById('firstLI');
setStyle(LI, 'list-style-position', 'outside');
setStyle(LI, 'list-style-position', 'outside');