JSFiddle - React, Tailwind, and code Playground
JavaScript
var xmlString = "<?xml version='1.0' ?>\
<root>\
<level1>\
<option>Option1</option>\
<option>Option2</option>\
<option>Option3</option>\
</level1>\
</root>";
var parser = new DOMParser();
var xmlDocument = parser.parseFromString( xmlString, "text/xml" );
var serializer = new XMLSerializer();
var string = serializer.serializeToString( xmlDocument );
alert( string );