xml.documentElement.getElementsByTagName works in firefox but not in chrome

in this code when i click button it calls validatesave() function.this function calls getlabtestno.jsp it contains data in the form of xml .using tagname i will get the labtestid with an alert() message.it is perfectly executed in firefox nut not in chrome where i nedd to change the code please let me know,thanks in advance


<!DOCTYPE html>
<html>
<body>


<form id="myForm">
First name: <input type="text" name="fname"><br>
<td><input type="button"  id="save" style="width: 100px; height: 30px;font-size: 14px;" accesskey="S" onclick="return validatesave()" value="S&#x0332;ave(Alt+s)"></button></td>

</form>

<script>
function validatesave()
{
alert("save is called");
             var searchUrl = 'getlabtestno.jsp';
             downloadUrl(searchUrl, function(data) {
              var xml = parseXml(data);
              var labtestid=0;

           var markerNodes = xml.documentElement.getElementsByTagName("getIds");


                labtestid = markerNodes[0].getAttribute("labtestid");
                console.log(labtestid);  
                alert("Lab Test ID is "+labtestid);
                   document.getElementById('labtestno').value = labtestid;
                   document.getElementById('labtestno').readOnly = true;
                    console.log("count is"+labtestid);  
              }); 
}
</script>

</body>
</html>

xml.documentElement.getElementsByTagName works in firefox but not in chrome

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