W3School TIY Editor
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<html> <head> <script type="text/javascript" src="/example/xdom/loadxmldoc.js"> </script> </head> <body> <script type="text/javascript"> xmlDoc=loadXMLDoc("/example/xdom/books.xml"); var x=xmlDoc.getElementsByTagName('book'); for(i=0;i<x.length;i++) { x.item(i).setAttribute("category","BESTSELLER"); } //Output all attribute values for (i=0;i<x.length;i++) { document.write(x[i].getAttribute('category')); document.write("<br />"); } </script> </body> </html>