JSFiddle - React, Tailwind, and code Playground

JavaScript

var stylesheetXml =
    '<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform">' +
        '<xsl:template match="/">' +
            '<div>' +
                '<xsl:value-of select=\'translate("Simple sting line"," ","_")\'/>' +
            '</div>' +
        '</xsl:template>' +
    '</xsl:stylesheet>';

var stylesheet = (new window.DOMParser()).parseFromString(stylesheetXml, "text/xml");

var xsltProcessor = new XSLTProcessor();
xsltProcessor.importStylesheet(stylesheet);

var empty = (new window.DOMParser()).parseFromString("", "text/xml");
var output = xsltProcessor.transformToDocument(empty);
var outputXml = (new XMLSerializer()).serializeToString(output)

document.write(outputXml);