Tryit Editor v1.8

Source Code:
<!DOCTYPE html> <html> <head> <script src="loadxmldoc.js"> </script> </head> <body> <script> xmlDoc=loadXMLDoc("books_ns.xml"); x=xmlDoc.getElementsByTagName("title")[0]; ns="../children/default.htm"; document.write("Attribute Found: "); document.write(x.hasAttributeNS(ns,"lang")); x.removeAttributeNS(ns,"lang"); document.write("<br>Attribute Found: "); document.write(x.hasAttributeNS(ns,"lang")); </script> </body> </html>
Result:
W3Schools.com - Try it yourself