in Tile/WFS.js you find
var resultFeatures = doc.getElementsByTagName("featureMember");
the actual tag should be "gml:featureMember" in IE
in Feature/WFS.js you find in processXMLNode
var point = xmlNode.getElementsByTagName("Point")
the actual tag should be "gml:Point" in IE
The next line reads
var text = point[0].textContent
this should be
var text = point[0].text
in IE
use something like
<script>
function getXmlNodeValue(xmlNode){
return Try.these(
function() {return xmlNode.text;},
function() {return xmlNode.textContent;)
);
}
</script>