There seems to be a problem with Internet Explorer 10 Release Preview. I don't know if this is a bug, or Microsoft has decided to remove the property XML DOM.
Test: http://www.w3schools.com/dom/tryit.asp?filename=try_dom_attr_xml
Result in Internet Explorer 10 Release Preview:
undefined
undefined
undefined
undefined
Result in Internet Explorer 10 Consumer Preview and earlier:
category="cooking"
category="children"
category="web"
category="web"