What does the following code do? var xhttp, xmlDoc, txt, x, i; xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { xmlDoc = this.responseXML; txt = ""; x = xmlDoc.getElementsByTagName("QUESTION"); for (i = 0; i < x.length; i++) { txt = txt + x[i].childNodes[0].nodeValue + "
"; } document.getElementById("demo").innerHTML = txt; } }; xhttp.open("GET", "questions.xml", true); xhttp.send();

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