JSFiddle - React, Tailwind, and code Playground

JavaScript

function saveXMLFile(filename, data) {
    var blob = new Blob([data], {type: 'text/xml'});
    if(window.navigator.msSaveOrOpenBlob) {
        window.navigator.msSaveBlob(blob, filename);
    }
    else{
        var elem = window.document.createElement('a');
        elem.href = window.URL.createObjectURL(blob);
        elem.download = filename;        
        document.body.appendChild(elem);
        elem.click();        
        document.body.removeChild(elem);
    }
}

saveXMLFile('my.xml', '<root><elem>hello</elem></root>');