Parse HTML string to document object and insert into DOM

HTML-parse.js

var HTML = "<div></span>Test</span></div>";
var body = document.querySelector("body");

function parseHTML(htmlString){
    
    var parser = new DOMParser();
    var fragment = document.createDocumentFragment();
        
    fragment.appendChild(parser.parseFromString(htmlString, "text/html").querySelector("body"));    
    body.appendChild(fragment);

}

parseHTML(HTML);